diff --git a/.eslintrc.json b/.eslintrc.json
deleted file mode 100644
index f298005..0000000
--- a/.eslintrc.json
+++ /dev/null
@@ -1,3 +0,0 @@
-{
-  "extends": ["react-app", "react-app/jest"]
-}
diff --git a/Jenkinsfile b/Jenkinsfile
index c09614e..621a28b 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -33,6 +33,11 @@ pipeline {
           sh 'npm run test'
         }
       }
+      stage('Check Lint') {
+        steps {
+          sh 'npm run lint'
+        }
+      }
       stage('Check Formatting') {
         steps {
           sh 'npx prettier --check .'
diff --git a/__test__/components/Calendar.test.tsx b/__test__/components/Calendar.test.tsx
index f699d55..0411b42 100644
--- a/__test__/components/Calendar.test.tsx
+++ b/__test__/components/Calendar.test.tsx
@@ -532,7 +532,7 @@ describe("calendar Availability search", () => {
       })
     );
 
-    const calendarRef = (window as any).__calendarRef;
+    const calendarRef = window.__calendarRef;
 
     await waitFor(() => {
       expect(calendarRef.current).not.toBeNull();
@@ -573,7 +573,7 @@ describe("calendar Availability search", () => {
       expect(spy).toHaveBeenCalled();
     });
 
-    const calendarRef = (window as any).__calendarRef;
+    const calendarRef = window.__calendarRef;
     const calendarApi = calendarRef.current;
     const view = calendarApi?.view;
     await act(async () => {
diff --git a/__test__/features/Calendars/CalendarModal.test.tsx b/__test__/features/Calendars/CalendarModal.test.tsx
index 330f4ec..13fc534 100644
--- a/__test__/features/Calendars/CalendarModal.test.tsx
+++ b/__test__/features/Calendars/CalendarModal.test.tsx
@@ -309,7 +309,7 @@ describe("CalendarPopover - Tabs Scenarios", () => {
   });
 
   it("copies CalDAV link from Access tab", async () => {
-    (window as any).CALENDAR_BASE_URL = "https://cal.example.org";
+    window.CALENDAR_BASE_URL = "https://cal.example.org";
     Object.assign(navigator, {
       clipboard: { writeText: jest.fn() },
     });
@@ -443,7 +443,7 @@ describe("CalendarPopover - Tabs Scenarios", () => {
   });
 
   it("fetches and resets the secret link", async () => {
-    (window as any).CALENDAR_BASE_URL = "https://cal.example.org";
+    window.CALENDAR_BASE_URL = "https://cal.example.org";
 
     (getSecretLink as jest.Mock)
       .mockResolvedValueOnce({
diff --git a/__test__/features/Calendars/CalendarSlice.test.tsx b/__test__/features/Calendars/CalendarSlice.test.tsx
index 6ae6171..96de7e1 100644
--- a/__test__/features/Calendars/CalendarSlice.test.tsx
+++ b/__test__/features/Calendars/CalendarSlice.test.tsx
@@ -10,15 +10,12 @@ import { Calendar } from "@/features/Calendars/CalendarTypes";
 import {
   addSharedCalendarAsync,
   createCalendarAsync,
-  deleteEventAsync,
   getCalendarDetailAsync,
   getCalendarsListAsync,
   getEventAsync,
   getTempCalendarsListAsync,
-  moveEventAsync,
   patchACLCalendarAsync,
   patchCalendarAsync,
-  putEventAsync,
   removeCalendarAsync,
 } from "@/features/Calendars/services";
 import { CalendarEvent } from "@/features/Events/EventsTypes";
diff --git a/__test__/features/Events/EventApi.test.tsx b/__test__/features/Events/EventApi.test.tsx
index 3eb11a8..2a21831 100644
--- a/__test__/features/Events/EventApi.test.tsx
+++ b/__test__/features/Events/EventApi.test.tsx
@@ -68,18 +68,18 @@ describe("eventApi", () => {
   });
 
   it("putEvent logs when status is 201", async () => {
-    const consoleLogSpy = jest.spyOn(console, "log").mockImplementation();
+    const consoleInfoSpy = jest.spyOn(console, "info").mockImplementation();
     const mockResponse = { status: 201, url: "/dav/cals/test.ics" };
     (api as unknown as jest.Mock).mockReturnValue(mockResponse);
 
     await putEvent(mockEvent);
 
-    expect(consoleLogSpy).toHaveBeenCalledWith(
+    expect(consoleInfoSpy).toHaveBeenCalledWith(
       "Event created successfully:",
       "/dav/cals/test.ics"
     );
 
-    consoleLogSpy.mockRestore();
+    consoleInfoSpy.mockRestore();
   });
 
   test("moveEvent sends MOVE request with destination header", async () => {
diff --git a/__test__/features/Events/EventDisplay.test.tsx b/__test__/features/Events/EventDisplay.test.tsx
index 8ae1e48..0fb2a27 100644
--- a/__test__/features/Events/EventDisplay.test.tsx
+++ b/__test__/features/Events/EventDisplay.test.tsx
@@ -27,7 +27,7 @@ describe("Event Preview Display", () => {
   beforeEach(() => {
     jest.clearAllMocks();
     sessionStorage.clear();
-    (window as any).MAIL_SPA_URL = null;
+    window.MAIL_SPA_URL = null;
   });
 
   const preloadedState = {
@@ -598,7 +598,7 @@ describe("Event Preview Display", () => {
     });
   });
   it("properly render message button when MAIL_SPA_URL is not null and event has attendees", () => {
-    (window as any).MAIL_SPA_URL = "test";
+    window.MAIL_SPA_URL = "test";
     renderWithProviders(
       <EventPreviewModal
         open={true}
@@ -612,7 +612,7 @@ describe("Event Preview Display", () => {
     expect(screen.getByText("eventPreview.emailAttendees")).toBeInTheDocument();
   });
   it("doesnt render message button when MAIL_SPA_URL is not null and event has no attendees", () => {
-    (window as any).MAIL_SPA_URL = "test";
+    window.MAIL_SPA_URL = "test";
     renderWithProviders(
       <EventPreviewModal
         open={true}
@@ -637,7 +637,7 @@ describe("Event Preview Display", () => {
     expect(screen.queryByTestId("EmailIcon")).not.toBeInTheDocument();
   });
   it("message button opens url with attendees as uri and title as subject", () => {
-    (window as any).MAIL_SPA_URL = "test";
+    window.MAIL_SPA_URL = "test";
     const mockOpen = jest.fn();
     window.open = mockOpen;
 
@@ -669,7 +669,7 @@ describe("Event Preview Display", () => {
   });
 
   it("message button encodes special characters in event title correctly", () => {
-    (window as any).MAIL_SPA_URL = "test";
+    window.MAIL_SPA_URL = "test";
     const mockOpen = jest.fn();
     window.open = mockOpen;
 
@@ -952,7 +952,7 @@ describe("Event Preview Display", () => {
 
     beforeEach(() => {
       jest.clearAllMocks();
-      (window as any).MAIL_SPA_URL = null;
+      window.MAIL_SPA_URL = null;
     });
 
     const createStateWithAttendees = (attendees: any[]) => ({
diff --git a/__test__/features/websocket/WebSocketGate.test.tsx b/__test__/features/websocket/WebSocketGate.test.tsx
index 2784885..ed591d0 100644
--- a/__test__/features/websocket/WebSocketGate.test.tsx
+++ b/__test__/features/websocket/WebSocketGate.test.tsx
@@ -322,7 +322,7 @@ describe("WebSocketGate", () => {
 
     it("should reset reconnection attempts counter on successful connection", async () => {
       jest.useFakeTimers();
-      const consoleLog = jest.spyOn(console, "log").mockImplementation();
+      const consoleLog = jest.spyOn(console, "info").mockImplementation();
       let onCloseCallback: Function | undefined;
 
       (createWebSocketConnection as jest.Mock).mockImplementation(
@@ -576,7 +576,7 @@ describe("WebSocketGate", () => {
 
     it("should reset attempt counter when online event fires", async () => {
       jest.useFakeTimers();
-      const consoleLog = jest.spyOn(console, "log").mockImplementation();
+      const consoleLog = jest.spyOn(console, "info").mockImplementation();
       let onCloseCallback: Function | undefined;
 
       (createWebSocketConnection as jest.Mock).mockImplementation(
diff --git a/__test__/features/websocket/createWebSocketConnection.test.tsx b/__test__/features/websocket/createWebSocketConnection.test.tsx
index 5c3154c..e7da29e 100644
--- a/__test__/features/websocket/createWebSocketConnection.test.tsx
+++ b/__test__/features/websocket/createWebSocketConnection.test.tsx
@@ -49,22 +49,22 @@ describe("createWebSocketConnection", () => {
 
   beforeEach(() => {
     ({ webSocketInstances, mockWebSocket, cleanup } = setupWebsocket());
-    (window as any).WEBSOCKET_URL = "wss://calendar.example.com";
+    window.WEBSOCKET_URL = "wss://calendar.example.com";
 
     (fetchWebSocketTicket as jest.Mock).mockResolvedValue(mockTicket);
   });
 
   afterEach(() => {
     jest.clearAllMocks();
-    delete (window as any).WEBSOCKET_URL;
-    delete (window as any).CALENDAR_BASE_URL;
+    delete window.WEBSOCKET_URL;
+    delete window.CALENDAR_BASE_URL;
     cleanup();
   });
 
   /** ---------- Tests ---------- */
 
   it("throws when WEBSOCKET_URL is not defined", async () => {
-    delete (window as any).WEBSOCKET_URL;
+    delete window.WEBSOCKET_URL;
     const mockCallbacks = {
       onMessage: jest.fn(),
     };
@@ -88,8 +88,8 @@ describe("createWebSocketConnection", () => {
   });
 
   it("creates WebSocket with correct URL and ticket without the WEBSOCKET_URL", async () => {
-    delete (window as any).WEBSOCKET_URL;
-    (window as any).CALENDAR_BASE_URL = "https://calendar.example.com";
+    delete window.WEBSOCKET_URL;
+    window.CALENDAR_BASE_URL = "https://calendar.example.com";
     await createAndOpenConnection();
 
     expect(mockWebSocket).toHaveBeenCalledWith(
diff --git a/__test__/features/websocket/utils/notificationStorm.test.tsx b/__test__/features/websocket/utils/notificationStorm.test.tsx
index be2160d..483b9b1 100644
--- a/__test__/features/websocket/utils/notificationStorm.test.tsx
+++ b/__test__/features/websocket/utils/notificationStorm.test.tsx
@@ -57,7 +57,7 @@ describe("websocket messages storm", () => {
     jest.resetModules();
     (getDisplayedCalendarRange as jest.Mock).mockReturnValue(mockRange);
     (store.getState as jest.Mock).mockReturnValue(mockState);
-    (window as any).WS_DEBOUNCE_PERIOD_MS = 500;
+    window.WS_DEBOUNCE_PERIOD_MS = 500;
     mockAccumulators.calendarsToRefresh = new Map<string, any>();
     mockAccumulators.calendarsToHide = new Set();
     mockAccumulators.currentDebouncePeriod = 0;
@@ -118,7 +118,7 @@ describe("websocket messages storm", () => {
   });
 
   it("executes immediately when debounce is disabled", () => {
-    (window as any).WS_DEBOUNCE_PERIOD_MS = 0;
+    window.WS_DEBOUNCE_PERIOD_MS = 0;
 
     updateCalendars(
       { "/calendars/cal1/entry1": { syncToken: "abc" } },
diff --git a/__test__/features/websocket/websocketAPI/registerToCalendars.test.tsx b/__test__/features/websocket/websocketAPI/registerToCalendars.test.tsx
index 2518bc4..cf20800 100644
--- a/__test__/features/websocket/websocketAPI/registerToCalendars.test.tsx
+++ b/__test__/features/websocket/websocketAPI/registerToCalendars.test.tsx
@@ -42,16 +42,16 @@ describe("registerToCalendars", () => {
   });
 
   it("should log registration", () => {
-    const consoleLogSpy = jest.spyOn(console, "log").mockImplementation();
+    const consoleInfoSpy = jest.spyOn(console, "info").mockImplementation();
     const calendarURIs = ["/calendars/cal1", "/calendars/cal2"];
 
     registerToCalendars(mockSocket, calendarURIs);
 
-    expect(consoleLogSpy).toHaveBeenCalledWith(
+    expect(consoleInfoSpy).toHaveBeenCalledWith(
       "Registered to calendars",
       calendarURIs
     );
 
-    consoleLogSpy.mockRestore();
+    consoleInfoSpy.mockRestore();
   });
 });
diff --git a/__test__/features/websocket/websocketAPI/unregisterToCalendars.test.tsx b/__test__/features/websocket/websocketAPI/unregisterToCalendars.test.tsx
index 923dd5b..bfa77c7 100644
--- a/__test__/features/websocket/websocketAPI/unregisterToCalendars.test.tsx
+++ b/__test__/features/websocket/websocketAPI/unregisterToCalendars.test.tsx
@@ -43,16 +43,16 @@ describe("unregisterToCalendars", () => {
   });
 
   it("should log unregistration", () => {
-    const consoleLogSpy = jest.spyOn(console, "log").mockImplementation();
+    const consoleInfoSpy = jest.spyOn(console, "info").mockImplementation();
     const calendarURIs = ["/calendars/cal1", "/calendars/cal2"];
 
     unregisterToCalendars(mockSocket, calendarURIs);
 
-    expect(consoleLogSpy).toHaveBeenCalledWith(
+    expect(consoleInfoSpy).toHaveBeenCalledWith(
       "Unregistered to calendars",
       calendarURIs
     );
 
-    consoleLogSpy.mockRestore();
+    consoleInfoSpy.mockRestore();
   });
 });
diff --git a/__test__/utils/calendarUtils.test.tsx b/__test__/utils/calendarUtils.test.tsx
index a170f85..1bb7b08 100644
--- a/__test__/utils/calendarUtils.test.tsx
+++ b/__test__/utils/calendarUtils.test.tsx
@@ -1,10 +1,5 @@
 import { getCalendarVisibility } from "@/components/Calendar/utils/calendarUtils";
-
-interface AclEntry {
-  privilege: string;
-  principal: string;
-  protected: boolean;
-}
+import { AclEntry } from "@/features/Calendars/types/CalendarData";
 
 describe("getCalendarVisibility", () => {
   it("returns 'public' when {DAV:}authenticated has {DAV:}read", () => {
diff --git a/eslint.config.js b/eslint.config.js
new file mode 100644
index 0000000..cafa9c6
--- /dev/null
+++ b/eslint.config.js
@@ -0,0 +1,74 @@
+import js from "@eslint/js";
+import tseslint from "typescript-eslint";
+import react from "eslint-plugin-react";
+import reactHooks from "eslint-plugin-react-hooks";
+import importPlugin from "eslint-plugin-import";
+import jest from "eslint-plugin-jest";
+import prettier from "eslint-config-prettier";
+
+export default [
+  {
+    ignores: ["dist", "build", "node_modules"],
+  },
+
+  js.configs.recommended,
+
+  ...tseslint.configs.recommended,
+
+  {
+    files: ["**/*.{js,jsx,ts,tsx}"],
+
+    languageOptions: {
+      parser: tseslint.parser,
+      parserOptions: {
+        ecmaVersion: "latest",
+        sourceType: "module",
+        ecmaFeatures: { jsx: true },
+        project: true,
+      },
+    },
+
+    plugins: {
+      react,
+      "react-hooks": reactHooks,
+      import: importPlugin,
+      jest,
+    },
+
+    settings: {
+      react: {
+        version: "detect",
+      },
+    },
+
+    rules: {
+      /* React */
+      "react/react-in-jsx-scope": "off", // React 18+
+      "react/prop-types": "off",
+
+      /* Hooks */
+      "react-hooks/rules-of-hooks": "error",
+      "react-hooks/exhaustive-deps": "warn",
+
+      /* Imports */
+      "import/order": "off",
+
+      /* TS */
+      "@typescript-eslint/no-unused-vars": [
+        "error",
+        { argsIgnorePattern: "^_" },
+      ],
+
+      /* Jest */
+      "jest/no-disabled-tests": "warn",
+      "jest/no-focused-tests": "error",
+
+      /* Prettier compatibility */
+      ...prettier.rules,
+
+      /* No noises */
+      "no-debugger": "error",
+      "no-console": ["warn", { allow: ["info", "warn", "error"] }],
+    },
+  },
+];
diff --git a/package-lock.json b/package-lock.json
index 7583aac..f3ad127 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -65,7 +65,7 @@
         "eslint": "^9.39.1",
         "eslint-config-prettier": "^10.1.8",
         "eslint-plugin-import": "^2.32.0",
-        "eslint-plugin-jest": "^29.2.1",
+        "eslint-plugin-jest": "^29.13.0",
         "eslint-plugin-promise": "^7.2.1",
         "eslint-plugin-react": "^7.37.5",
         "eslint-plugin-react-hooks": "^7.0.1",
@@ -77,7 +77,8 @@
         "prettier": "^3.6.2",
         "ts-jest": "^29.4.6",
         "ts-node": "^10.9.2",
-        "typescript": "^4.9.5"
+        "typescript": "^4.9.5",
+        "typescript-eslint": "^8.54.0"
       },
       "engines": {
         "node": "24.x"
@@ -141,6 +142,7 @@
       "integrity": "sha512-e7jT4DxYvIDLk1ZHmU/m/mB19rex9sv0c2ftBtjSBv+kVM/902eh0fINUzD7UwLLNR+jU585GxUJ8/EBfAM5fw==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@babel/code-frame": "^7.27.1",
         "@babel/generator": "^7.28.5",
@@ -2073,6 +2075,7 @@
         }
       ],
       "license": "MIT",
+      "peer": true,
       "engines": {
         "node": ">=18"
       },
@@ -2096,6 +2099,7 @@
         }
       ],
       "license": "MIT",
+      "peer": true,
       "engines": {
         "node": ">=18"
       }
@@ -2198,6 +2202,7 @@
       "resolved": "https://registry.npmjs.org/@emotion/react/-/react-11.14.0.tgz",
       "integrity": "sha512-O000MLDBDdk/EohJPFUqvnp4qnHeYkVP5B0xEG0D/L7cOKP9kefu2DXn8dj74cQfsEzUqh+sr1RzFqiL1o+PpA==",
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@babel/runtime": "^7.18.3",
         "@emotion/babel-plugin": "^11.13.5",
@@ -2241,6 +2246,7 @@
       "resolved": "https://registry.npmjs.org/@emotion/styled/-/styled-11.14.1.tgz",
       "integrity": "sha512-qEEJt42DuToa3gurlH4Qqc1kVpNq8wO8cJtDzU46TjlzWjDlsVyevtYCRijVq3SrHsROS+gVQ8Fnea108GnKzw==",
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@babel/runtime": "^7.18.3",
         "@emotion/babel-plugin": "^11.13.5",
@@ -2287,9 +2293,9 @@
       "license": "MIT"
     },
     "node_modules/@eslint-community/eslint-utils": {
-      "version": "4.9.0",
-      "resolved": "https://registry.npmjs.org/@eslint-community/eslint-utils/-/eslint-utils-4.9.0.tgz",
-      "integrity": "sha512-ayVFHdtZ+hsq1t2Dy24wCmGXGe4q9Gu3smhLYALJrr473ZH27MsnSL+LKUlimp4BWJqMDMLmPpx/Q9R3OAlL4g==",
+      "version": "4.9.1",
+      "resolved": "https://registry.npmjs.org/@eslint-community/eslint-utils/-/eslint-utils-4.9.1.tgz",
+      "integrity": "sha512-phrYmNiYppR7znFEdqgfWHXR6NCkZEK7hwWDHZUjit/2/U0r6XvkDl0SYnoM51Hq7FhCGdLDT6zxCCOY1hexsQ==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -2513,6 +2519,7 @@
       "resolved": "https://registry.npmjs.org/@fullcalendar/core/-/core-6.1.20.tgz",
       "integrity": "sha512-1cukXLlePFiJ8YKXn/4tMKsy0etxYLCkXk8nUCFi11nRONF2Ba2CD5b21/ovtOO2tL6afTJfwmc1ed3HG7eB1g==",
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "preact": "~10.12.1"
       }
@@ -3271,6 +3278,7 @@
       "resolved": "https://registry.npmjs.org/@mui/material/-/material-7.3.6.tgz",
       "integrity": "sha512-R4DaYF3dgCQCUAkr4wW1w26GHXcf5rCmBRHVBuuvJvaGLmZdD8EjatP80Nz5JCw0KxORAzwftnHzXVnjR8HnFw==",
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@babel/runtime": "^7.28.4",
         "@mui/core-downloads-tracker": "^7.3.6",
@@ -3381,6 +3389,7 @@
       "resolved": "https://registry.npmjs.org/@mui/system/-/system-7.3.6.tgz",
       "integrity": "sha512-8fehAazkHNP1imMrdD2m2hbA9sl7Ur6jfuNweh5o4l9YPty4iaZzRXqYvBCWQNwFaSHmMEj2KPbyXGp7Bt73Rg==",
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@babel/runtime": "^7.28.4",
         "@mui/private-theming": "^7.3.6",
@@ -3739,6 +3748,7 @@
       "integrity": "sha512-LvoOF53PL6zXgdzEhgnnP51S4FseDFH1bHrobK4EK6zZX/tN8qgf5tdlmN7h4OkMv/Qs1oUfvj0QcLWSstnnvA==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@rspack/core": "1.6.8",
         "@rspack/lite-tapable": "~1.1.0",
@@ -3966,6 +3976,7 @@
       "integrity": "sha512-FolcIAH5FW4J2FET+qwjd1kNeFbCkd0VLuIHO0thyolEjaPSxw5qxG67DA7BZGm6PVcoiSgPLks1DL6eZ8c+fA==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@module-federation/runtime-tools": "0.21.6",
         "@rspack/binding": "1.6.8",
@@ -4225,6 +4236,7 @@
       "integrity": "sha512-8QqtOQT5ACVlmsvKOJNEaWmRPmcojMOzCz4Hs2BGG/toAp/K38LcsMRyLp349glq5AzJbCEeimEoxaX6v/fLrA==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@babel/core": "^7.21.3",
         "@svgr/babel-preset": "8.1.0",
@@ -4309,6 +4321,7 @@
       "integrity": "sha512-TXTnIcNJQEKwThMMqBXsZ4VGAza6bvN4pa41Rkqoio6QBKMvo+5lexeTMScGCIxtzgQJzElcvIltani+adC5PQ==",
       "dev": true,
       "license": "Apache-2.0",
+      "peer": true,
       "dependencies": {
         "tslib": "^2.8.0"
       }
@@ -4319,6 +4332,7 @@
       "integrity": "sha512-o4PXJQidqJl82ckFaXUeoAW+XysPLauYI43Abki5hABd853iMhitooc6znOnczgbTYmEP6U6/y1ZyKAIsvMKGg==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@babel/code-frame": "^7.10.4",
         "@babel/runtime": "^7.12.5",
@@ -4621,6 +4635,7 @@
       "integrity": "sha512-N2clP5pJhB2YnZJ3PIHFk5RkygRX5WO/5f0WC08tp0wd+sv0rsJk3MqWn3CbNmT2J505a5336jaQj4ph1AdMug==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "undici-types": "~6.21.0"
       }
@@ -4642,6 +4657,7 @@
       "resolved": "https://registry.npmjs.org/@types/react/-/react-18.3.27.tgz",
       "integrity": "sha512-cisd7gxkzjBKU2GgdYrTdtQx1SORymWyaAFhaxQPK9bYO9ot3Y5OikQRvY0VYQtvwjeQnizCINJAenh/V7MK2w==",
       "license": "MIT",
+      "peer": true,
       "dependencies": {
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       },
@@ -12329,6 +12363,7 @@
       "resolved": "https://registry.npmjs.org/react-dom/-/react-dom-18.3.1.tgz",
       "integrity": "sha512-5m4nQKp+rZRb09LNH59GM4BxTh9251/ylbKIbpe7TpGxfJ+9kv6BLkLBXIjjspbgbnIBNqlI23tRnTWT0snUIw==",
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "loose-envify": "^1.1.0",
         "scheduler": "^0.23.2"
@@ -12348,6 +12383,7 @@
       "resolved": "https://registry.npmjs.org/react-redux/-/react-redux-9.2.0.tgz",
       "integrity": "sha512-ROY9fvHhwOD9ySfrF0wmvu//bKCQ6AeZZq1nJNtbDC+kk5DuSuNX/n6YWYF/SYy7bSba4D4FSz8DJeKY/S/r+g==",
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@types/use-sync-external-store": "^0.0.6",
         "use-sync-external-store": "^1.4.0"
@@ -12372,6 +12408,7 @@
       "integrity": "sha512-QgT5//D3jfjJb6Gsjxv0Slpj23ip+HtOpnNgnb2S5zU3CB26G/IDPGoy4RJB42wzFE46DRsstbW6tKHoKbhAxw==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "engines": {
         "node": ">=0.10.0"
       }
@@ -12472,7 +12509,8 @@
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/redux/-/redux-5.0.1.tgz",
       "integrity": "sha512-M9/ELqF6fy8FwmkpnF0S3YKOqMyoWJ4+CS5Efg2ct3oY9daQvd/Pc71FpGZsVsbl3Cpb+IIcjBDUnnyBdQbq4w==",
-      "license": "MIT"
+      "license": "MIT",
+      "peer": true
     },
     "node_modules/redux-first-history": {
       "version": "5.2.0",
@@ -13699,6 +13737,7 @@
       "integrity": "sha512-5gTmgEY/sqK6gFXLIsQNH19lWb4ebPDLA4SdLP7dsWkIXHWlG66oPuVvXSGFPppYZz8ZDZq0dYYrbHfBCVUb1Q==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "engines": {
         "node": ">=12"
       },
@@ -13783,9 +13822,9 @@
       }
     },
     "node_modules/ts-api-utils": {
-      "version": "2.3.0",
-      "resolved": "https://registry.npmjs.org/ts-api-utils/-/ts-api-utils-2.3.0.tgz",
-      "integrity": "sha512-6eg3Y9SF7SsAvGzRHQvvc1skDAhwI4YQ32ui1scxD1Ccr0G5qIIbUBT3pFTKX8kmWIQClHobtUdNuaBgwdfdWg==",
+      "version": "2.4.0",
+      "resolved": "https://registry.npmjs.org/ts-api-utils/-/ts-api-utils-2.4.0.tgz",
+      "integrity": "sha512-3TaVTaAv2gTiMB35i3FiGJaRfwb3Pyn/j3m/bfAvGe8FB7CF6u+LMYqYlDh7reQf7UNvoTvdfAqHGmPGOSsPmA==",
       "dev": true,
       "license": "MIT",
       "engines": {
@@ -13879,6 +13918,7 @@
       "resolved": "https://registry.npmjs.org/ts-node/-/ts-node-10.9.2.tgz",
       "integrity": "sha512-f0FFpIdcHgn8zcPSbf1dRevwt047YMnaiJM3u2w2RewrB+fob/zePZcrOyQoLMMO7aBIddLcQIEK5dYjkLnGrQ==",
       "dev": true,
+      "peer": true,
       "dependencies": {
         "@cspotcode/source-map-support": "^0.8.0",
         "@tsconfig/node10": "^1.0.7",
@@ -14095,6 +14135,7 @@
       "integrity": "sha512-1FXk9E2Hm+QzZQ7z+McJiHL4NW1F2EzMu9Nq9i3zAaGqibafqYwCVU6WyWAuyQRRzOlxou8xZSyXLEN8oKj24g==",
       "dev": true,
       "license": "Apache-2.0",
+      "peer": true,
       "bin": {
         "tsc": "bin/tsc",
         "tsserver": "bin/tsserver"
@@ -14103,6 +14144,30 @@
         "node": ">=4.2.0"
       }
     },
+    "node_modules/typescript-eslint": {
+      "version": "8.54.0",
+      "resolved": "https://registry.npmjs.org/typescript-eslint/-/typescript-eslint-8.54.0.tgz",
+      "integrity": "sha512-CKsJ+g53QpsNPqbzUsfKVgd3Lny4yKZ1pP4qN3jdMOg/sisIDLGyDMezycquXLE5JsEU0wp3dGNdzig0/fmSVQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@typescript-eslint/eslint-plugin": "8.54.0",
+        "@typescript-eslint/parser": "8.54.0",
+        "@typescript-eslint/typescript-estree": "8.54.0",
+        "@typescript-eslint/utils": "8.54.0"
+      },
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/typescript-eslint"
+      },
+      "peerDependencies": {
+        "eslint": "^8.57.0 || ^9.0.0",
+        "typescript": ">=4.8.4 <6.0.0"
+      }
+    },
     "node_modules/uglify-js": {
       "version": "3.19.3",
       "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.19.3.tgz",
@@ -14903,6 +14968,7 @@
       "integrity": "sha512-0wZ1IRqGGhMP76gLqz8EyfBXKk0J2qo2+H3fi4mcUP/KtTocoX08nmIAHl1Z2kJIZbZee8KOpBCSNPRgauucjw==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "funding": {
         "url": "https://github.com/sponsors/colinhacks"
       }
diff --git a/package.json b/package.json
index 416d7d8..8541a63 100644
--- a/package.json
+++ b/package.json
@@ -41,7 +41,8 @@
     "build": "rsbuild build",
     "preview": "rsbuild preview",
     "test": "jest",
-    "lint": "eslint src --ext .js,.jsx,.ts,.tsx",
+    "lint": "eslint src",
+    "lint:fix": "eslint src --fix",
     "jest-preview": "jest-preview"
   },
   "browserslist": {
@@ -83,7 +84,7 @@
     "eslint": "^9.39.1",
     "eslint-config-prettier": "^10.1.8",
     "eslint-plugin-import": "^2.32.0",
-    "eslint-plugin-jest": "^29.2.1",
+    "eslint-plugin-jest": "^29.13.0",
     "eslint-plugin-promise": "^7.2.1",
     "eslint-plugin-react": "^7.37.5",
     "eslint-plugin-react-hooks": "^7.0.1",
@@ -95,6 +96,7 @@
     "prettier": "^3.6.2",
     "ts-jest": "^29.4.6",
     "ts-node": "^10.9.2",
-    "typescript": "^4.9.5"
+    "typescript": "^4.9.5",
+    "typescript-eslint": "^8.54.0"
   }
 }
diff --git a/src/App.tsx b/src/App.tsx
index adb25b7..ed8637e 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -48,7 +48,7 @@ function App() {
   );
   const settingsLanguage = useAppSelector((state) => state.settings.language);
   const savedLang = localStorage.getItem("lang");
-  const defaultLang = (window as any).LANG;
+  const defaultLang = window.LANG;
 
   const lang =
     [userLanguage, settingsLanguage, savedLang, defaultLang].find(
diff --git a/src/components/Attendees/AttendeeSearch.tsx b/src/components/Attendees/AttendeeSearch.tsx
index 5324bea..99cd962 100644
--- a/src/components/Attendees/AttendeeSearch.tsx
+++ b/src/components/Attendees/AttendeeSearch.tsx
@@ -15,7 +15,7 @@ export default function UserSearch({
   placeholder,
 }: {
   attendees: userAttendee[];
-  setAttendees: Function;
+  setAttendees: (attendees: userAttendee[]) => void;
   disabled?: boolean;
   inputSlot?: (
     params: ExtendedAutocompleteRenderInputParams
@@ -47,7 +47,7 @@ export default function UserSearch({
       disabled={disabled}
       inputSlot={inputSlot}
       placeholder={placeholder}
-      onChange={(event: any, value: User[]) => {
+      onChange={(_event, value: User[]) => {
         setAttendees(
           value.map((attendee: User) =>
             createAttendee({
diff --git a/src/components/Attendees/PeopleSearch.tsx b/src/components/Attendees/PeopleSearch.tsx
index 2350535..e0f59aa 100644
--- a/src/components/Attendees/PeopleSearch.tsx
+++ b/src/components/Attendees/PeopleSearch.tsx
@@ -23,6 +23,7 @@ import {
   useEffect,
   useState,
   type ReactNode,
+  type SyntheticEvent,
 } from "react";
 import { useI18n } from "twake-i18n";
 
@@ -55,7 +56,7 @@ export function PeopleSearch({
   customSlotProps,
 }: {
   selectedUsers: User[];
-  onChange: (event: any, users: User[]) => void;
+  onChange: (event: SyntheticEvent, users: User[]) => void;
   objectTypes: string[];
   disabled?: boolean;
   freeSolo?: boolean;
@@ -155,7 +156,7 @@ export function PeopleSearch({
         ),
       };
 
-      const enhancedParamsWithInputProps = {
+      const enhancedParams = {
         ...params,
         InputProps: inputProps,
         inputProps: {
@@ -164,8 +165,6 @@ export function PeopleSearch({
         },
       };
 
-      const { InputProps, ...enhancedParams } = enhancedParamsWithInputProps;
-
       const handleEnterKey = (e: React.KeyboardEvent<HTMLInputElement>) => {
         if (e.key === "Enter" && onToggleEventPreview) {
           e.preventDefault();
@@ -193,7 +192,7 @@ export function PeopleSearch({
               {t("peopleSearch.label")}
             </label>
             {inputSlot({
-              ...enhancedParamsWithInputProps,
+              ...enhancedParams,
               error: !!inputError,
               helperText: inputError,
               placeholder: searchPlaceholder,
@@ -218,6 +217,7 @@ export function PeopleSearch({
         </>
       );
     },
+    // eslint-disable-next-line react-hooks/exhaustive-deps
     [inputError, t, onToggleEventPreview, loading, searchPlaceholder]
   );
 
@@ -296,7 +296,7 @@ export function PeopleSearch({
         }
         renderOption={(props, option) => {
           if (selectedUsers.find((u) => u.email === option.email)) return null;
-          const { key, ...otherProps } = props as any;
+          const { key, ...otherProps } = props;
           return (
             <ListItem key={key + option?.email} {...otherProps} disableGutters>
               <ListItemAvatar>
diff --git a/src/components/Calendar/AccessTab.tsx b/src/components/Calendar/AccessTab.tsx
index da4bf54..529aa3f 100644
--- a/src/components/Calendar/AccessTab.tsx
+++ b/src/components/Calendar/AccessTab.tsx
@@ -22,7 +22,7 @@ import { SnackbarAlert } from "../Loading/SnackBarAlert";
 
 export function AccessTab({ calendar }: { calendar: Calendar }) {
   const { t } = useI18n();
-  const calDAVLink = `${(window as any).CALENDAR_BASE_URL}${calendar.link.replace(".json", "")}`;
+  const calDAVLink = `${window.CALENDAR_BASE_URL}${calendar.link.replace(".json", "")}`;
 
   const [secretLink, setSecretLink] = useState("");
   const [open, setOpen] = useState(false);
diff --git a/src/components/Calendar/Calendar.tsx b/src/components/Calendar/Calendar.tsx
index 5e2a3cf..7c3e4b9 100644
--- a/src/components/Calendar/Calendar.tsx
+++ b/src/components/Calendar/Calendar.tsx
@@ -15,6 +15,7 @@ import { extractEventBaseUuid } from "@/utils/extractEventBaseUuid";
 import { setSelectedCalendars as setSelectedCalendarsToStorage } from "@/utils/storage/setSelectedCalendars";
 import { useSelectedCalendars } from "@/utils/storage/useSelectedCalendars";
 import { browserDefaultTimeZone } from "@/utils/timezone";
+import type { EventApi, LocaleInput } from "@fullcalendar/core";
 import { CalendarApi, DateSelectArg } from "@fullcalendar/core";
 import frLocale from "@fullcalendar/core/locales/fr";
 import ruLocale from "@fullcalendar/core/locales/ru";
@@ -47,7 +48,7 @@ import {
   updateSlotLabelVisibility,
 } from "./utils/calendarUtils";
 
-const localeMap: Record<string, any> = {
+const localeMap: Record<string, LocaleInput | undefined> = {
   fr: frLocale,
   ru: ruLocale,
   vi: viLocale,
@@ -221,7 +222,7 @@ export default function CalendarApp({
     [rangeStart, rangeEnd]
   );
 
-  let filteredEvents: CalendarEvent[] = extractEvents(
+  const filteredEvents: CalendarEvent[] = extractEvents(
     selectedCalendars,
     calendars || {},
     userData?.email,
@@ -233,7 +234,7 @@ export default function CalendarApp({
     [tempcalendars]
   );
 
-  let filteredTempEvents: CalendarEvent[] = extractEvents(
+  const filteredTempEvents: CalendarEvent[] = extractEvents(
     tempCalendarIds,
     tempcalendars || {},
     userData?.email,
@@ -303,7 +304,7 @@ export default function CalendarApp({
                   },
                 })
               ).unwrap();
-            } catch (error) {
+            } catch {
               fetchedRangesRef.current[id] = "";
             }
           });
@@ -323,6 +324,7 @@ export default function CalendarApp({
     return () => {
       cancelled = true;
     };
+    // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [dispatch, rangeKey, sortedSelectedCalendars, rangeStart, rangeEnd]);
 
   useEffect(() => {
@@ -352,6 +354,7 @@ export default function CalendarApp({
           prefetchedCalendarsRef.current[id] = "";
         });
     });
+    // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [
     calendarIdsString,
     selectedCalendars,
@@ -458,7 +461,7 @@ export default function CalendarApp({
                 calType: "temp",
               })
             ).unwrap();
-          } catch (error) {
+          } catch {
             tempFetchedRangesRef.current[id] = "";
           }
         });
@@ -521,7 +524,7 @@ export default function CalendarApp({
               })
             );
           }
-        } catch (err) {
+        } catch {
           // Ignore sessionStorage errors
         }
       }
@@ -543,10 +546,10 @@ export default function CalendarApp({
     null
   );
   const [, setTypeOfAction] = useState<"solo" | "all" | undefined>(undefined);
-  const [afterChoiceFunc, setAfterChoiceFunc] = useState<Function>();
-  const [selectedEvent, setSelectedEvent] = useState<CalendarEvent>(
-    {} as CalendarEvent
-  );
+  const [afterChoiceFunc, setAfterChoiceFunc] = useState<
+    ((type: "solo" | "all" | undefined) => void) | undefined
+  >();
+  const [, setSelectedEvent] = useState<CalendarEvent>({} as CalendarEvent);
   const [selectedRange, setSelectedRange] = useState<DateSelectArg | null>(
     null
   );
@@ -587,7 +590,7 @@ export default function CalendarApp({
   });
 
   if (process.env.NODE_ENV === "test") {
-    (window as any).__calendarRef = calendarRef;
+    window.__calendarRef = calendarRef;
   }
 
   const { t, lang } = useI18n();
@@ -635,7 +638,6 @@ export default function CalendarApp({
         <MiniCalendar
           calendarRef={calendarRef}
           selectedDate={selectedMiniDate}
-          setSelectedDate={setSelectedDate}
           setSelectedMiniDate={setSelectedMiniDate}
           dottedEvents={dottedEvents}
         />
@@ -697,7 +699,7 @@ export default function CalendarApp({
               userData?.email,
               isPending
             )}
-            eventOrder={(a: any, b: any) =>
+            eventOrder={(a: EventApi, b: EventApi) =>
               a.extendedProps.priority - b.extendedProps.priority
             }
             weekNumbers={
@@ -825,10 +827,11 @@ export default function CalendarApp({
         <EditModeDialog
           type={openEditModePopup}
           setOpen={setOpenEditModePopup}
-          event={selectedEvent}
           eventAction={(type: "solo" | "all" | undefined) => {
             setTypeOfAction(type);
-            afterChoiceFunc && afterChoiceFunc(type);
+            if (afterChoiceFunc) {
+              afterChoiceFunc(type);
+            }
           }}
         />
         {openEventDisplay && eventDisplayedId && eventDisplayedCalId && (
diff --git a/src/components/Calendar/CalendarColorPicker.tsx b/src/components/Calendar/CalendarColorPicker.tsx
index 2337b22..c856fd2 100644
--- a/src/components/Calendar/CalendarColorPicker.tsx
+++ b/src/components/Calendar/CalendarColorPicker.tsx
@@ -123,11 +123,11 @@ function ColorPickerBox({
     selectedColor ?? { light: "#ffffff", dark: "#808080" }
   );
   const [color, setColor] = useState(oldColor);
-  const [anchorEl, setAnchorEl] = useState<HTMLButtonElement | null>(null);
+  const [anchorEl, setAnchorEl] = useState<HTMLElement | null>(null);
   const open = Boolean(anchorEl);
   const theme = useTheme();
 
-  const handleClick = (event: any) => {
+  const handleClick = (event: React.MouseEvent<HTMLDivElement>) => {
     setAnchorEl(event.currentTarget);
   };
 
diff --git a/src/components/Calendar/CalendarLayout.tsx b/src/components/Calendar/CalendarLayout.tsx
index 5a729fb..3dc7e8e 100644
--- a/src/components/Calendar/CalendarLayout.tsx
+++ b/src/components/Calendar/CalendarLayout.tsx
@@ -1,6 +1,7 @@
 import { useAppDispatch, useAppSelector } from "@/app/hooks";
 import SettingsPage from "@/features/Settings/SettingsPage";
 import { getCalendarRange } from "@/utils/dateUtils";
+import type { CalendarApi } from "@fullcalendar/core";
 import { useEffect, useRef, useState } from "react";
 import { ErrorSnackbar } from "../Error/ErrorSnackbar";
 import { refreshCalendars } from "../Event/utils/eventUtils";
@@ -8,7 +9,7 @@ import { Menubar, MenubarProps } from "../Menubar/Menubar";
 import CalendarApp from "./Calendar";
 
 export default function CalendarLayout() {
-  const calendarRef = useRef<any>(null);
+  const calendarRef = useRef<CalendarApi | null>(null);
   const dispatch = useAppDispatch();
   const error = useAppSelector((state) => state.calendars.error);
   const selectedCalendars = useAppSelector((state) => state.calendars.list);
diff --git a/src/components/Calendar/CalendarModal.tsx b/src/components/Calendar/CalendarModal.tsx
index 5bc2d49..195cd8b 100644
--- a/src/components/Calendar/CalendarModal.tsx
+++ b/src/components/Calendar/CalendarModal.tsx
@@ -138,28 +138,30 @@ function CalendarPopover({
           newCalColor,
           newCalVisibility
         );
-        importedContent &&
+        if (importedContent) {
           dispatch(
             importEventFromFileAsync({
               calLink: `/calendar/${userData.openpaasId}/${calId}.json`,
               file: importedContent,
             })
           );
+        }
       }
     } else {
-      importedContent &&
+      if (importedContent) {
         dispatch(
           importEventFromFileAsync({
             calLink: calendars[importTarget].link,
             file: importedContent,
           })
         );
+      }
     }
     handleClose({}, "backdropClick");
   };
 
   const handleClose = (
-    e: {},
+    e: object | null,
     reason: "backdropClick" | "escapeKeyDown"
   ): void => {
     onClose(e, reason);
@@ -182,7 +184,7 @@ function CalendarPopover({
       open={open}
       onClose={() => handleClose({}, "backdropClick")}
       title={
-        <Tabs value={tab} onChange={(e, v) => setTab(v)}>
+        <Tabs value={tab} onChange={(_e, v) => setTab(v)}>
           <Tab
             value="settings"
             label={
@@ -203,7 +205,7 @@ function CalendarPopover({
         <>
           <Button
             variant="outlined"
-            onClick={(e) => handleClose({}, "backdropClick")}
+            onClick={() => handleClose({}, "backdropClick")}
           >
             {t("common.cancel")}
           </Button>
diff --git a/src/components/Calendar/CalendarSearch.tsx b/src/components/Calendar/CalendarSearch.tsx
index 4e6cc6b..d9a5bd3 100644
--- a/src/components/Calendar/CalendarSearch.tsx
+++ b/src/components/Calendar/CalendarSearch.tsx
@@ -21,7 +21,7 @@ import { ColorPicker } from "./CalendarColorPicker";
 import { defaultColors, getAccessiblePair } from "./utils/calendarColorsUtils";
 
 interface CalendarWithOwner {
-  cal: Record<string, any>;
+  cal: Record<string, unknown>;
   owner: User;
 }
 
@@ -117,7 +117,7 @@ function SelectedCalendarsList({
     >
   >((acc, cal) => {
     const exists = Object.values(calendars).some(
-      (existing: any) =>
+      (existing: Calendar) =>
         existing.id ===
         cal.cal?._links?.self?.href
           .replace("/calendars/", "")
@@ -190,13 +190,14 @@ function SelectedCalendarsList({
 }
 
 export default function CalendarSearch({
-  anchorEl,
   open,
   onClose,
 }: {
-  anchorEl: HTMLElement | null;
   open: boolean;
-  onClose: Function;
+  onClose: (
+    result?: string[] | Record<string, never>,
+    reason?: "backdropClick" | "escapeKeyDown"
+  ) => void;
 }) {
   const dispatch = useAppDispatch();
   const theme = useTheme();
@@ -214,7 +215,7 @@ export default function CalendarSearch({
         selectedCal.map(async (cal) => {
           const calId = crypto.randomUUID();
           const exists = Object.values(calendars).some(
-            (existing: any) =>
+            (existing: Calendar) =>
               existing.id ===
               cal.cal?._links?.self?.href
                 .replace("/calendars/", "")
@@ -279,7 +280,7 @@ export default function CalendarSearch({
         objectTypes={["user"]}
         selectedUsers={selectedUsers}
         inputSlot={(params) => <TextField {...params} size="small" />}
-        onChange={async (event: any, value: User[]) => {
+        onChange={async (_event: React.SyntheticEvent, value: User[]) => {
           setSelectedUsers(value);
 
           const cals = await Promise.all(
@@ -288,10 +289,10 @@ export default function CalendarSearch({
                 const cals = (await getCalendars(
                   user.openpaasId,
                   "sharedPublic=true&"
-                )) as Record<string, any>;
+                )) as Record<string, unknown>;
                 return cals._embedded?.["dav:calendar"]
                   ? cals._embedded["dav:calendar"].map(
-                      (cal: Record<string, any>) => ({ cal, owner: user })
+                      (cal: Record<string, unknown>) => ({ cal, owner: user })
                     )
                   : { cal: undefined, owner: user };
               }
diff --git a/src/components/Calendar/CalendarSelection.tsx b/src/components/Calendar/CalendarSelection.tsx
index 69b00a0..7036c89 100644
--- a/src/components/Calendar/CalendarSelection.tsx
+++ b/src/components/Calendar/CalendarSelection.tsx
@@ -13,12 +13,11 @@ import {
   ListItem,
   Menu,
   MenuItem,
-  Typography,
 } from "@linagora/twake-mui";
 import AddIcon from "@mui/icons-material/Add";
 import ExpandMoreIcon from "@mui/icons-material/ExpandMore";
 import MoreHorizIcon from "@mui/icons-material/MoreHoriz";
-import { useEffect, useMemo, useState } from "react";
+import { SetStateAction, useEffect, useMemo, useState } from "react";
 import { useI18n } from "twake-i18n";
 import CalendarPopover from "./CalendarModal";
 import CalendarSearch from "./CalendarSearch";
@@ -39,9 +38,9 @@ function CalendarAccordion({
   selectedCalendars: string[];
   handleToggle: (id: string) => void;
   showAddButton?: boolean;
-  onAddClick?: Function;
+  onAddClick?: () => void;
   defaultExpanded?: boolean;
-  setOpen: Function;
+  setOpen: (id: string) => void;
 }) {
   const allCalendars = useAppSelector((state) => state.calendars.list);
   const { t } = useI18n();
@@ -86,8 +85,12 @@ function CalendarAccordion({
           <IconButton
             component="span"
             onClick={(e) => {
-              expended && e.stopPropagation();
-              onAddClick && onAddClick();
+              if (expended) {
+                e.stopPropagation();
+              }
+              if (onAddClick) {
+                onAddClick();
+              }
             }}
           >
             <AddIcon />
@@ -116,7 +119,7 @@ export default function CalendarSelection({
   setSelectedCalendars,
 }: {
   selectedCalendars: string[];
-  setSelectedCalendars: Function;
+  setSelectedCalendars: (value: SetStateAction<string[]>) => void;
 }) {
   const { t } = useI18n();
   const userId =
@@ -202,7 +205,6 @@ export default function CalendarSelection({
         }}
       />
       <CalendarSearch
-        anchorEl={anchorElCalOthers}
         open={Boolean(anchorElCalOthers)}
         onClose={(newCalIds?: string[]) => {
           setAnchorElCalOthers(null);
@@ -228,7 +230,7 @@ function CalendarSelector({
   isPersonal: boolean;
   selectedCalendars: string[];
   handleCalendarToggle: (name: string) => void;
-  setOpen: Function;
+  setOpen: () => void;
 }) {
   const { t } = useI18n();
   const dispatch = useAppDispatch();
diff --git a/src/components/Calendar/ImportTab.tsx b/src/components/Calendar/ImportTab.tsx
index d8fa630..8204e1f 100644
--- a/src/components/Calendar/ImportTab.tsx
+++ b/src/components/Calendar/ImportTab.tsx
@@ -24,21 +24,21 @@ export function ImportTab({
 }: {
   userId: string;
   importTarget: string;
-  setImportTarget: Function;
-  setImportedContent: Function;
+  setImportTarget: (target: string) => void;
+  setImportedContent: (content: File | null) => void;
   newCalParams: {
     name: string;
-    setName: Function;
+    setName: (name: string) => void;
     description: string;
     setDescription: (d: string) => void;
     color: Record<string, string>;
-    setColor: Function;
+    setColor: (color: Record<string, string>) => void;
     visibility: "public" | "private";
-    setVisibility: Function;
+    setVisibility: (visibility: "public" | "private") => void;
   };
 }) {
   const { t } = useI18n();
-  const [importMode, setImportMode] = useState<"file" | "url">("file");
+  const [importMode] = useState<"file" | "url">("file");
   const [importFile, setImportFile] = useState<File | null>(null);
   const [importUrl, setImportUrl] = useState("");
   const calendars = useAppSelector((state) => state.calendars.list);
@@ -48,7 +48,7 @@ export function ImportTab({
 
   useEffect(() => {
     setImportedContent(importMode === "file" ? importFile : null);
-  }, [importFile, importUrl, importMode]);
+  }, [importFile, importUrl, importMode, setImportedContent]);
 
   return (
     <>
diff --git a/src/components/Calendar/MiniCalendar.tsx b/src/components/Calendar/MiniCalendar.tsx
index 2b5abed..f8aa7db 100644
--- a/src/components/Calendar/MiniCalendar.tsx
+++ b/src/components/Calendar/MiniCalendar.tsx
@@ -13,19 +13,20 @@ import moment from "moment";
 import KeyboardArrowDownIcon from "@mui/icons-material/KeyboardArrowDown";
 import { useEffect, useState } from "react";
 import { useI18n } from "twake-i18n";
+import { CalendarEvent } from "@/features/Events/EventsTypes";
+import type { CalendarApi } from "@fullcalendar/core";
 
 export function MiniCalendar({
   calendarRef,
   selectedDate,
-  setSelectedDate,
+
   setSelectedMiniDate,
   dottedEvents,
 }: {
-  calendarRef: any;
+  calendarRef: React.MutableRefObject<CalendarApi | null>;
   selectedDate: Date;
-  setSelectedDate: (d: Date) => void;
   setSelectedMiniDate: (d: Date) => void;
-  dottedEvents: any[];
+  dottedEvents: CalendarEvent[];
 }) {
   const dispatch = useAppDispatch();
   const calendars = useAppSelector((state) => state.calendars);
diff --git a/src/components/Calendar/SettingsTab.tsx b/src/components/Calendar/SettingsTab.tsx
index c445093..6051ee7 100644
--- a/src/components/Calendar/SettingsTab.tsx
+++ b/src/components/Calendar/SettingsTab.tsx
@@ -27,13 +27,13 @@ export function SettingsTab({
   calendar,
 }: {
   name: string;
-  setName: Function;
+  setName: (name: string) => void;
   description: string;
   setDescription: (d: string) => void;
   color: Record<string, string>;
-  setColor: Function;
+  setColor: (color: Record<string, string>) => void;
   visibility: "public" | "private";
-  setVisibility: Function;
+  setVisibility: (visibility: "public" | "private") => void;
   calendar?: Calendar;
 }) {
   const { t } = useI18n();
diff --git a/src/components/Calendar/TempCalendarsInput.tsx b/src/components/Calendar/TempCalendarsInput.tsx
index 32f3f92..2aaf55b 100644
--- a/src/components/Calendar/TempCalendarsInput.tsx
+++ b/src/components/Calendar/TempCalendarsInput.tsx
@@ -22,7 +22,7 @@ export function TempCalendarsInput({
   setTempUsers: (users: User[]) => void;
   handleToggleEventPreview: () => void;
   selectedCalendars: string[];
-  setSelectedCalendars: Function;
+  setSelectedCalendars: React.Dispatch<React.SetStateAction<string[]>>;
 }) {
   const dispatch = useAppDispatch();
   const tempcalendars =
@@ -34,7 +34,7 @@ export function TempCalendarsInput({
   const prevUsersRef = useRef<User[]>([]);
   const userColorsRef = useRef(new Map<string, string>());
 
-  const handleUserChange = async (_: any, users: User[]) => {
+  const handleUserChange = async (_: React.SyntheticEvent, users: User[]) => {
     setTempUsers(users);
 
     const prevUsers = prevUsersRef.current;
diff --git a/src/components/Calendar/handlers/eventHandlers.ts b/src/components/Calendar/handlers/eventHandlers.ts
index 2e1642f..6ef6e5d 100644
--- a/src/components/Calendar/handlers/eventHandlers.ts
+++ b/src/components/Calendar/handlers/eventHandlers.ts
@@ -13,7 +13,12 @@ import { CalendarEvent } from "@/features/Events/EventsTypes";
 import { userAttendee } from "@/features/User/models/attendee";
 import { createAttendee } from "@/features/User/models/attendee.mapper";
 import { getDeltaInMilliseconds } from "@/utils/dateUtils";
-import { CalendarApi, DateSelectArg, EventDropArg } from "@fullcalendar/core";
+import {
+  CalendarApi,
+  DateSelectArg,
+  EventClickArg,
+  EventDropArg,
+} from "@fullcalendar/core";
 import { EventResizeDoneArg } from "@fullcalendar/interaction";
 
 export interface EventHandlersProps {
@@ -27,7 +32,9 @@ export interface EventHandlersProps {
   setEventDisplayedTemp: (temp: boolean) => void;
   calendars: Record<string, Calendar>;
   setSelectedEvent: (event: CalendarEvent) => void;
-  setAfterChoiceFunc: (func: Function) => void;
+  setAfterChoiceFunc: (
+    func: ((type: "solo" | "all" | undefined) => void) | undefined
+  ) => void;
   setOpenEditModePopup: (open: string) => void;
   tempUsers: User[];
   setTempEvent: (event: CalendarEvent) => void;
@@ -87,7 +94,7 @@ export const createEventHandlers = (props: EventHandlersProps) => {
     setOpenEventDisplay(false);
   };
 
-  const handleEventClick = (info: any) => {
+  const handleEventClick = (info: EventClickArg) => {
     info.jsEvent.preventDefault();
 
     if (info.event.url) {
diff --git a/src/components/Calendar/handlers/mouseHandlers.ts b/src/components/Calendar/handlers/mouseHandlers.ts
index ad4bcf9..5a2bfab 100644
--- a/src/components/Calendar/handlers/mouseHandlers.ts
+++ b/src/components/Calendar/handlers/mouseHandlers.ts
@@ -1,5 +1,9 @@
+interface CalendarHTMLElement extends HTMLElement {
+  __calendarMouseMoveHandler?: (e: MouseEvent) => void;
+  __calendarMouseLeaveHandler?: () => void;
+}
 export interface MouseHandlersProps {
-  calendarEl: HTMLElement;
+  calendarEl: CalendarHTMLElement;
 }
 
 export const createMouseHandlers = (props: MouseHandlersProps) => {
@@ -75,24 +79,24 @@ export const createMouseHandlers = (props: MouseHandlersProps) => {
     calendarEl.addEventListener("mousemove", handleMouseMove);
     calendarEl.addEventListener("mouseleave", handleMouseLeave);
 
-    (calendarEl as any).__calendarMouseMoveHandler = handleMouseMove;
-    (calendarEl as any).__calendarMouseLeaveHandler = handleMouseLeave;
+    calendarEl.__calendarMouseMoveHandler = handleMouseMove;
+    calendarEl.__calendarMouseLeaveHandler = handleMouseLeave;
   };
 
   const removeMouseEventListeners = () => {
-    if ((calendarEl as any).__calendarMouseMoveHandler) {
+    if (calendarEl.__calendarMouseMoveHandler) {
       calendarEl.removeEventListener(
         "mousemove",
-        (calendarEl as any).__calendarMouseMoveHandler
+        calendarEl.__calendarMouseMoveHandler
       );
-      delete (calendarEl as any).__calendarMouseMoveHandler;
+      delete calendarEl.__calendarMouseMoveHandler;
     }
-    if ((calendarEl as any).__calendarMouseLeaveHandler) {
+    if (calendarEl.__calendarMouseLeaveHandler) {
       calendarEl.removeEventListener(
         "mouseleave",
-        (calendarEl as any).__calendarMouseLeaveHandler
+        calendarEl.__calendarMouseLeaveHandler
       );
-      delete (calendarEl as any).__calendarMouseLeaveHandler;
+      delete calendarEl.__calendarMouseLeaveHandler;
     }
   };
 
diff --git a/src/components/Calendar/handlers/viewHandlers.ts b/src/components/Calendar/handlers/viewHandlers.ts
index de60a05..9e61fc0 100644
--- a/src/components/Calendar/handlers/viewHandlers.ts
+++ b/src/components/Calendar/handlers/viewHandlers.ts
@@ -2,7 +2,14 @@ import { EventErrorHandler } from "@/components/Error/EventErrorHandler";
 import { EventChip } from "@/components/Event/EventChip/EventChip";
 import { Calendar } from "@/features/Calendars/CalendarTypes";
 import { userAttendee } from "@/features/User/models/attendee";
-import { CalendarApi, NowIndicatorContentArg } from "@fullcalendar/core";
+import {
+  CalendarApi,
+  DayHeaderMountArg,
+  EventContentArg,
+  EventMountArg,
+  NowIndicatorContentArg,
+  ViewMountArg,
+} from "@fullcalendar/core";
 import React from "react";
 import { createMouseHandlers } from "./mouseHandlers";
 
@@ -46,7 +53,7 @@ export const createViewHandlers = (props: ViewHandlersProps) => {
     }
   };
 
-  const handleDayHeaderDidMount = (arg: any) => {
+  const handleDayHeaderDidMount = (arg: DayHeaderMountArg) => {
     if (arg.view.type === "timeGridWeek") {
       const headerEl = arg.el;
 
@@ -61,22 +68,19 @@ export const createViewHandlers = (props: ViewHandlersProps) => {
       };
 
       headerEl.addEventListener("click", handleDayHeaderClick);
-      (headerEl as any).__dayHeaderClickHandler = handleDayHeaderClick;
+      headerEl.__dayHeaderClickHandler = handleDayHeaderClick;
     }
   };
 
-  const handleDayHeaderWillUnmount = (arg: any) => {
+  const handleDayHeaderWillUnmount = (arg: DayHeaderMountArg) => {
     const headerEl = arg.el;
-    if ((headerEl as any).__dayHeaderClickHandler) {
-      headerEl.removeEventListener(
-        "click",
-        (headerEl as any).__dayHeaderClickHandler
-      );
-      delete (headerEl as any).__dayHeaderClickHandler;
+    if (headerEl.__dayHeaderClickHandler) {
+      headerEl.removeEventListener("click", headerEl.__dayHeaderClickHandler);
+      delete headerEl.__dayHeaderClickHandler;
     }
   };
 
-  const handleViewDidMount = (arg: any) => {
+  const handleViewDidMount = (arg: ViewMountArg) => {
     if (arg.view.type === "timeGridWeek" || arg.view.type === "timeGridDay") {
       const calendarEl = document.querySelector(".fc") as HTMLElement;
       if (calendarEl) {
@@ -86,15 +90,15 @@ export const createViewHandlers = (props: ViewHandlersProps) => {
     }
   };
 
-  const handleViewWillUnmount = (arg: any) => {
-    if ((arg.el as any).__timeInterval) {
-      clearInterval((arg.el as any).__timeInterval);
-      delete (arg.el as any).__timeInterval;
+  const handleViewWillUnmount = (arg: ViewMountArg) => {
+    if (arg.el.__timeInterval) {
+      clearInterval(arg.el.__timeInterval);
+      delete arg.el.__timeInterval;
     }
 
-    if ((arg.el as any).__timeObserver) {
-      (arg.el as any).__timeObserver.disconnect();
-      delete (arg.el as any).__timeObserver;
+    if (arg.el.__timeObserver) {
+      arg.el.__timeObserver.disconnect();
+      delete arg.el.__timeObserver;
     }
 
     const calendarEl = document.querySelector(".fc") as HTMLElement;
@@ -104,7 +108,7 @@ export const createViewHandlers = (props: ViewHandlersProps) => {
     }
   };
 
-  const handleEventContent = (arg: any) => {
+  const handleEventContent = (arg: EventContentArg) => {
     return React.createElement(EventChip, {
       arg,
       calendars,
@@ -113,7 +117,7 @@ export const createViewHandlers = (props: ViewHandlersProps) => {
     });
   };
 
-  const handleEventDidMount = (arg: any) => {
+  const handleEventDidMount = (arg: EventMountArg) => {
     const attendees = arg.event._def.extendedProps.attendee || [];
     if (!calendars[arg.event._def.extendedProps.calId]) return;
     const ownerEmails = new Set(
diff --git a/src/components/Calendar/hooks/useCalendarEventHandlers.ts b/src/components/Calendar/hooks/useCalendarEventHandlers.ts
index 10a860c..b8f2eaa 100644
--- a/src/components/Calendar/hooks/useCalendarEventHandlers.ts
+++ b/src/components/Calendar/hooks/useCalendarEventHandlers.ts
@@ -1,3 +1,4 @@
+/* eslint-disable react-hooks/exhaustive-deps */
 import { useCallback } from "react";
 import {
   createEventHandlers,
diff --git a/src/components/Calendar/hooks/useCalendarViewHandlers.ts b/src/components/Calendar/hooks/useCalendarViewHandlers.ts
index 25d63c3..83d76e1 100644
--- a/src/components/Calendar/hooks/useCalendarViewHandlers.ts
+++ b/src/components/Calendar/hooks/useCalendarViewHandlers.ts
@@ -1,3 +1,4 @@
+/* eslint-disable react-hooks/exhaustive-deps */
 import { useCallback } from "react";
 import {
   createViewHandlers,
diff --git a/src/components/Calendar/utils/calendarUtils.ts b/src/components/Calendar/utils/calendarUtils.ts
index ee7e472..dfe0912 100644
--- a/src/components/Calendar/utils/calendarUtils.ts
+++ b/src/components/Calendar/utils/calendarUtils.ts
@@ -1,12 +1,12 @@
-import { refreshSingularCalendar } from "@/components/Event/utils/eventUtils";
+import { AppDispatch } from "@/app/store";
 import { Calendar } from "@/features/Calendars/CalendarTypes";
 import { getCalendarDetailAsync } from "@/features/Calendars/services";
+import { AclEntry } from "@/features/Calendars/types/CalendarData";
 import { CalendarEvent } from "@/features/Events/EventsTypes";
 import { formatDateToYYYYMMDDTHHMMSS } from "@/utils/dateUtils";
 import { extractEventBaseUuid } from "@/utils/extractEventBaseUuid";
 import { convertEventDateTimeToISO } from "@/utils/timezone";
 import { SlotLabelContentArg } from "@fullcalendar/core";
-import { ThunkDispatch } from "@reduxjs/toolkit";
 import moment from "moment-timezone";
 import { useI18n } from "twake-i18n";
 
@@ -56,7 +56,10 @@ export const checkIfCurrentWeekOrDay = (): boolean => {
   return !!nowIndicator;
 };
 
-export function formatEventChipTitle(e: CalendarEvent, t: Function) {
+export function formatEventChipTitle(
+  e: CalendarEvent,
+  t: (key: string) => string
+) {
   if (!e.title) {
     return t("event.untitled");
   }
@@ -72,6 +75,7 @@ export const eventToFullCalendarFormat = (
   userAddress: string | undefined,
   pending: boolean
 ) => {
+  // eslint-disable-next-line react-hooks/rules-of-hooks
   const { t } = useI18n();
   return filteredEvents
     .concat(filteredTempEvents.map((e) => ({ ...e, temp: true })))
@@ -83,7 +87,11 @@ export const eventToFullCalendarFormat = (
         : true; // if there are no organizer in the event we assume it was organized by the owner
       const isPersonnalEvent =
         extractEventBaseUuid(e.calId) === userId && isOrganiser;
-      const convertedEvent: any = {
+      const convertedEvent: CalendarEvent & {
+        colors: Record<string, string> | undefined;
+        editable: boolean;
+        priority: number;
+      } = {
         ...e,
         title: formatEventChipTitle(e, t),
         colors: e.color,
@@ -147,7 +155,7 @@ export const updateCalsDetails = (
   pending: boolean,
   rangeKey: string,
   previousRangeKey: string,
-  dispatch: Function,
+  dispatch: AppDispatch,
   calendarRange: { start: Date; end: Date },
   calType?: "temp",
   controllers?: Map<string, AbortController>
@@ -223,15 +231,9 @@ export const updateCalsDetails = (
   }
 };
 
-interface AclEntry {
-  privilege: string;
-  principal: string;
-  protected: boolean;
-}
-
 export function getCalendarVisibility(acl: AclEntry[]): "private" | "public" {
   let hasRead = false;
-  let hasFreeBusy = false;
+  // const hasFreeBusy = false;
   if (acl) {
     for (const entry of acl) {
       if (entry.principal !== "{DAV:}authenticated") continue;
diff --git a/src/components/Dialog/ResponsiveDialog.tsx b/src/components/Dialog/ResponsiveDialog.tsx
index bf9f9bb..198dc2d 100644
--- a/src/components/Dialog/ResponsiveDialog.tsx
+++ b/src/components/Dialog/ResponsiveDialog.tsx
@@ -158,7 +158,7 @@ function ResponsiveDialog({
   }, [isExpanded]);
 
   const handleClose = (
-    event: {},
+    event: unknown,
     reason: "backdropClick" | "escapeKeyDown"
   ) => {
     if (isExpanded && reason === "backdropClick") {
diff --git a/src/components/Event/EditModeDialog.tsx b/src/components/Event/EditModeDialog.tsx
index 74c4b7d..08aebad 100644
--- a/src/components/Event/EditModeDialog.tsx
+++ b/src/components/Event/EditModeDialog.tsx
@@ -1,4 +1,3 @@
-import { CalendarEvent } from "@/features/Events/EventsTypes";
 import {
   Button,
   ButtonGroup,
@@ -16,12 +15,10 @@ import { useI18n } from "twake-i18n";
 export function EditModeDialog({
   type,
   setOpen,
-  event,
   eventAction,
 }: {
   type: string | null;
   setOpen: (e: string | null) => void;
-  event: CalendarEvent;
   eventAction: (type: "solo" | "all" | undefined) => void;
 }) {
   const { t } = useI18n();
diff --git a/src/components/Event/EventChip/ErrorEventChip.tsx b/src/components/Event/EventChip/ErrorEventChip.tsx
index 5945309..4ff2d6f 100644
--- a/src/components/Event/EventChip/ErrorEventChip.tsx
+++ b/src/components/Event/EventChip/ErrorEventChip.tsx
@@ -1,4 +1,5 @@
 import { EventErrorHandler } from "@/components/Error/EventErrorHandler";
+import { EventContentArg } from "@fullcalendar/core";
 import { Card, Typography } from "@linagora/twake-mui";
 import { useEffect, useRef } from "react";
 
@@ -7,18 +8,30 @@ export function ErrorEventChip({
   errorHandler,
   error,
 }: {
-  event: any;
+  event: EventContentArg["event"];
   errorHandler: EventErrorHandler;
-  error: any;
+  error: unknown;
 }) {
   const hasReported = useRef(false);
 
   useEffect(() => {
     if (!hasReported.current) {
-      const message =
-        error instanceof Error
-          ? error.message
-          : `${error.class} error during rendering ${event._def.extendedProps.uid || event.id}`;
+      let message: string;
+
+      if (error instanceof Error) {
+        message = error.message;
+      } else if (
+        typeof error === "object" &&
+        error !== null &&
+        "class" in error
+      ) {
+        message = `${String(
+          (error as { class: string }).class
+        )} error during rendering ${event._def.extendedProps.uid || event.id}`;
+      } else {
+        message = `Unknown error during rendering ${event._def.extendedProps.uid || event.id}`;
+      }
+
       errorHandler.reportError(
         event._def.extendedProps.uid || event.id,
         message
diff --git a/src/components/Event/EventChip/EventChip.tsx b/src/components/Event/EventChip/EventChip.tsx
index 7b55c8c..fc73da7 100644
--- a/src/components/Event/EventChip/EventChip.tsx
+++ b/src/components/Event/EventChip/EventChip.tsx
@@ -59,7 +59,7 @@ export function EventChip({
     const ownerEmails = new Set(
       calendar.ownerEmails?.map((e) => e.toLowerCase())
     );
-    const delegated = calendar.delegated;
+    // const delegated = calendar.delegated;
 
     // Determine owner attendee
     const ownerAttendee = getOwnerAttendee(attendees, ownerEmails);
@@ -258,7 +258,7 @@ export function EventChip({
           !event._def.extendedProps.allday &&
           event._def.extendedProps.organizer &&
           !showCompact &&
-          (window as any).displayOrgAvatar && (
+          window.displayOrgAvatar && (
             <Avatar
               children={OrganizerAvatar.children}
               color={OrganizerAvatar.color}
diff --git a/src/components/Event/EventChip/EventChipUtils.tsx b/src/components/Event/EventChip/EventChipUtils.tsx
index 51c9b1e..041247b 100644
--- a/src/components/Event/EventChip/EventChipUtils.tsx
+++ b/src/components/Event/EventChip/EventChipUtils.tsx
@@ -1,6 +1,7 @@
 import { EventErrorHandler } from "@/components/Error/EventErrorHandler";
 import { Calendar } from "@/features/Calendars/CalendarTypes";
 import { userAttendee } from "@/features/User/models/attendee";
+import { EventContentArg } from "@fullcalendar/core";
 import { getContrastRatio } from "@linagora/twake-mui";
 import CancelIcon from "@mui/icons-material/Cancel";
 import HelpOutlineIcon from "@mui/icons-material/HelpOutline";
@@ -12,7 +13,7 @@ import { EVENT_DURATION } from "./EventChip";
 const COMPACT_WIDTH_THRESHOLD = 100;
 
 export interface EventChipProps {
-  arg: any;
+  arg: EventContentArg["event"];
   calendars: Record<string, Calendar>;
   tempcalendars: Record<string, Calendar>;
   errorHandler: EventErrorHandler;
@@ -23,9 +24,9 @@ export interface IconDisplayConfig {
   needAction: boolean;
   private: boolean;
 }
-export function getEventDuration(event: any): number {
-  return moment(event._instance.range.end).diff(
-    moment(event._instance.range.start),
+export function getEventDuration(event: EventContentArg["event"]): number {
+  return moment(event._instance?.range.end).diff(
+    moment(event._instance?.range.start),
     "minutes"
   );
 }
@@ -34,7 +35,10 @@ export function getBestColor(colors: { light: string; dark: string }): string {
   const contrastToLight = getContrastRatio(colors?.light, "#fff");
   return contrastToDark > contrastToLight ? colors?.dark : colors?.light;
 }
-export function getEventTimes(event: any, timeZone: string) {
+export function getEventTimes(
+  event: EventContentArg["event"],
+  timeZone: string
+) {
   return {
     startTime: moment.tz(event.start, timeZone).format("HH:mm"),
     endTime: moment.tz(event.end, timeZone).format("HH:mm"),
@@ -52,7 +56,7 @@ export function getOwnerAttendee(
 export function getTitleStyle(
   bestColor: string,
   partstat?: string,
-  calendar?: any
+  calendar?: Calendar
 ): React.CSSProperties {
   const baseStyle: React.CSSProperties = {
     fontFamily: "Roboto",
@@ -122,7 +126,7 @@ export function getCardStyle(
   bestColor: string,
   eventLength: number,
   partstat?: string,
-  calendar?: any
+  calendar?: Calendar
 ): React.CSSProperties {
   const baseStyle: React.CSSProperties = getCardVariantStyle(
     getEventVariant(eventLength),
diff --git a/src/components/Event/EventDuplicate.tsx b/src/components/Event/EventDuplicate.tsx
index 41f2c55..44fd9ae 100644
--- a/src/components/Event/EventDuplicate.tsx
+++ b/src/components/Event/EventDuplicate.tsx
@@ -1,14 +1,9 @@
-import { CalendarEvent } from "@/features/Events/EventsTypes";
 import { MenuItem } from "@linagora/twake-mui";
 import { useI18n } from "twake-i18n";
 
 export default function EventDuplication({
-  onClose,
-  event,
   onOpenDuplicate,
 }: {
-  onClose: Function;
-  event: CalendarEvent;
   onOpenDuplicate?: () => void;
 }) {
   const { t } = useI18n();
diff --git a/src/components/Event/EventFormFields.tsx b/src/components/Event/EventFormFields.tsx
index 592bd92..60d5bd0 100644
--- a/src/components/Event/EventFormFields.tsx
+++ b/src/components/Event/EventFormFields.tsx
@@ -21,17 +21,15 @@ import {
   ToggleButton,
   ToggleButtonGroup,
   Typography,
-  useTheme,
 } from "@linagora/twake-mui";
-import { alpha } from "@mui/material/styles";
 import {
   Close as DeleteIcon,
   ContentCopy as CopyIcon,
-  Public as PublicIcon,
   LocationOn as LocationIcon,
+  Public as PublicIcon,
 } from "@mui/icons-material";
-import SquareRoundedIcon from "@mui/icons-material/SquareRounded";
 import LockOutlineIcon from "@mui/icons-material/LockOutline";
+import SquareRoundedIcon from "@mui/icons-material/SquareRounded";
 import React from "react";
 import { useI18n } from "twake-i18n";
 import AttendeeSelector from "../Attendees/AttendeeSearch";
@@ -163,7 +161,6 @@ export default function EventFormFields({
   onHasEndDateChangedChange,
 }: EventFormFieldsProps) {
   const { t } = useI18n();
-  const theme = useTheme();
 
   // Internal state for 4 separate fields
   const [startDate, setStartDate] = React.useState("");
@@ -377,7 +374,6 @@ export default function EventFormFields({
       showMore,
     });
   }, [
-    title,
     startDate,
     startTime,
     endDate,
diff --git a/src/components/Event/EventRepeat.tsx b/src/components/Event/EventRepeat.tsx
index ab0a40f..2528a6b 100644
--- a/src/components/Event/EventRepeat.tsx
+++ b/src/components/Event/EventRepeat.tsx
@@ -25,7 +25,7 @@ export default function RepeatEvent({
 }: {
   repetition: RepetitionObject;
   eventStart: Date;
-  setRepetition: Function;
+  setRepetition: (repetition: RepetitionObject) => void;
   isOwn?: boolean;
 }) {
   const { t } = useI18n();
diff --git a/src/components/Event/components/DateTimeFields.tsx b/src/components/Event/components/DateTimeFields.tsx
index b380784..de43fb2 100644
--- a/src/components/Event/components/DateTimeFields.tsx
+++ b/src/components/Event/components/DateTimeFields.tsx
@@ -83,7 +83,6 @@ export const DateTimeFields: React.FC<DateTimeFieldsProps> = ({
   showMore,
   hasEndDateChanged,
   showEndDate,
-  onToggleEndDate,
   validation,
   onStartDateChange,
   onStartTimeChange,
diff --git a/src/components/Event/components/DateTimeSummary.tsx b/src/components/Event/components/DateTimeSummary.tsx
index 91c1d11..36223ea 100644
--- a/src/components/Event/components/DateTimeSummary.tsx
+++ b/src/components/Event/components/DateTimeSummary.tsx
@@ -88,7 +88,7 @@ export const DateTimeSummary: React.FC<DateTimeSummaryProps> = ({
       const offset = getTimezoneOffset(tz, dateForOffset);
       const tzName = tz.replace(/_/g, " ");
       return `(${offset}) ${tzName}`;
-    } catch (error) {
+    } catch {
       return tz.replace(/_/g, " ");
     }
   };
diff --git a/src/components/Event/components/EditableTimeField.tsx b/src/components/Event/components/EditableTimeField.tsx
index 3335dc5..92339d1 100644
--- a/src/components/Event/components/EditableTimeField.tsx
+++ b/src/components/Event/components/EditableTimeField.tsx
@@ -19,12 +19,12 @@ import { parseTimeInput } from "../utils/dateTimeHelpers";
 
 type FieldType = "date" | "time" | "date-time";
 
-type GenericPickerFieldProps = PickerFieldProps<any, any, any> & {
+type GenericPickerFieldProps = PickerFieldProps<Dayjs, false, false> & {
   fieldType: FieldType;
   validator: (
-    value: any,
+    value: Dayjs | null,
     context: PickerValidationScope,
-    adapter: PickerFieldAdapter<any>
+    adapter: PickerFieldAdapter<Dayjs>
   ) => string | null;
 };
 
@@ -223,7 +223,7 @@ function EditableTimePickerField(props: GenericPickerFieldProps) {
     dispatchCloseOtherPickers();
   };
 
-  const handleBlur = (e: React.FocusEvent<HTMLInputElement>) => {
+  const handleBlur = (_e: React.FocusEvent<HTMLInputElement>) => {
     // If dropdown is open, don't parse input
     // MUI will handle selection and sync value via useEffect
     if (pickerContext.open) {
diff --git a/src/components/Event/components/ReadOnlyPickerField.tsx b/src/components/Event/components/ReadOnlyPickerField.tsx
index 55a6b40..bfdb5de 100644
--- a/src/components/Event/components/ReadOnlyPickerField.tsx
+++ b/src/components/Event/components/ReadOnlyPickerField.tsx
@@ -12,15 +12,16 @@ import {
   useValidation,
   validateDate,
 } from "@mui/x-date-pickers/validation";
+import { Dayjs } from "dayjs";
 
 type FieldType = "date" | "time" | "date-time";
 
-type GenericPickerFieldProps = PickerFieldProps<any, any, any> & {
+type GenericPickerFieldProps = PickerFieldProps<Dayjs, false, false> & {
   fieldType: FieldType;
   validator: (
-    value: any,
+    value: Dayjs | null,
     context: PickerValidationScope,
-    adapter: PickerFieldAdapter<any>
+    adapter: PickerFieldAdapter<Dayjs>
   ) => string | null;
 };
 
diff --git a/src/components/Event/eventHandlers/eventHandlers.ts b/src/components/Event/eventHandlers/eventHandlers.ts
index 1e0a0c0..2eb3051 100644
--- a/src/components/Event/eventHandlers/eventHandlers.ts
+++ b/src/components/Event/eventHandlers/eventHandlers.ts
@@ -119,28 +119,18 @@ export async function handleRSVP(
 export function handleDelete(
   isRecurring: boolean,
   typeOfAction: "solo" | "all" | undefined,
-  onClose: (event: {}, reason: "backdropClick" | "escapeKeyDown") => void,
-  dispatch: Function,
+  onClose: (event: unknown, reason: "backdropClick" | "escapeKeyDown") => void,
+  dispatch: AppDispatch,
   calendar: Calendar,
   event: CalendarEvent,
   calId: string,
   eventId: string
 ) {
-  if (isRecurring) {
-    onClose({}, "backdropClick");
-    if (typeOfAction === "solo") {
-      dispatch(deleteEventInstanceAsync({ cal: calendar, event }));
-    } else {
-      dispatch(
-        deleteEventAsync({
-          calId,
-          eventId,
-          eventURL: event.URL,
-        })
-      );
-    }
+  onClose({}, "backdropClick");
+
+  if (isRecurring && typeOfAction === "solo") {
+    dispatch(deleteEventInstanceAsync({ cal: calendar, event }));
   } else {
-    onClose({}, "backdropClick");
     dispatch(
       deleteEventAsync({
         calId,
diff --git a/src/components/Event/utils/eventUtils.tsx b/src/components/Event/utils/eventUtils.tsx
index a5a6207..ab51f05 100644
--- a/src/components/Event/utils/eventUtils.tsx
+++ b/src/components/Event/utils/eventUtils.tsx
@@ -16,7 +16,7 @@ import CheckCircleIcon from "@mui/icons-material/CheckCircle";
 export function renderAttendeeBadge(
   a: userAttendee,
   key: string,
-  t: Function,
+  t: (key: string) => string,
   isFull?: boolean,
   isOrganizer?: boolean
 ) {
@@ -110,7 +110,9 @@ export async function refreshCalendars(
 ) {
   if (process.env.NODE_ENV === "test") return;
 
-  !calType && (await dispatch(getCalendarsListAsync()));
+  if (!calType) {
+    await dispatch(getCalendarsListAsync());
+  }
 
   const results = await Promise.allSettled(
     calendars.map((calendar) =>
diff --git a/src/components/Loading/SnackBarAlert.tsx b/src/components/Loading/SnackBarAlert.tsx
index a1b4393..4681dcb 100644
--- a/src/components/Loading/SnackBarAlert.tsx
+++ b/src/components/Loading/SnackBarAlert.tsx
@@ -8,7 +8,7 @@ export function SnackbarAlert({
   severity = "success",
 }: {
   open: boolean;
-  setOpen: Function;
+  setOpen: (o: boolean) => void;
   message: string;
   severity?: AlertColor;
 }) {
diff --git a/src/components/Menubar/EventSearchBar.tsx b/src/components/Menubar/EventSearchBar.tsx
index 228fb4c..07ea2ed 100644
--- a/src/components/Menubar/EventSearchBar.tsx
+++ b/src/components/Menubar/EventSearchBar.tsx
@@ -142,7 +142,7 @@ export default function SearchBar() {
     setFilterError(false);
   };
 
-  const handleContactSelect = (_event: any, contacts: User[]) => {
+  const handleContactSelect = (contacts: User[]) => {
     setSelectedContacts(contacts);
     setSearch("");
     if (contacts.length > 0) {
@@ -173,7 +173,9 @@ export default function SearchBar() {
       dispatch(setView("search"));
       setAnchorEl(null);
     } else {
-      filterOpen && setFilterError(true);
+      if (filterOpen) {
+        setFilterError(true);
+      }
     }
   };
 
@@ -222,8 +224,8 @@ export default function SearchBar() {
         {extended && (
           <PeopleSearch
             selectedUsers={selectedContacts}
-            onChange={(event, users) => {
-              handleContactSelect(event, users);
+            onChange={(_event, users) => {
+              handleContactSelect(users);
             }}
             objectTypes={["user", "contact"]}
             onToggleEventPreview={() => {}}
diff --git a/src/components/Menubar/Menubar.tsx b/src/components/Menubar/Menubar.tsx
index 895100e..e9935c2 100644
--- a/src/components/Menubar/Menubar.tsx
+++ b/src/components/Menubar/Menubar.tsx
@@ -56,9 +56,9 @@ export function Menubar({
   currentView,
   onViewChange,
 }: MenubarProps) {
-  const { t, lang } = useI18n(); // deliberately NOT using f()
+  const { t } = useI18n(); // deliberately NOT using f()
   const user = useAppSelector((state) => state.user.userData);
-  const applist: AppIconProps[] = (window as any).appList ?? [];
+  const applist: AppIconProps[] = window.appList ?? [];
   const [anchorEl, setAnchorEl] = useState<null | HTMLElement>(null);
   const [userMenuAnchorEl, setUserMenuAnchorEl] = useState<null | HTMLElement>(
     null
diff --git a/src/features/Calendars/CalendarApi.ts b/src/features/Calendars/CalendarApi.ts
index 48788e2..898e472 100644
--- a/src/features/Calendars/CalendarApi.ts
+++ b/src/features/Calendars/CalendarApi.ts
@@ -1,10 +1,11 @@
 import { api } from "@/utils/apiUtils";
+import { CalendarInput, CalendarList } from "./types/CalendarData";
 
 export async function getCalendars(
   userId: string,
   scope: string = "personal=true&sharedDelegationStatus=accepted&sharedPublicSubscription=true&",
   signal?: AbortSignal
-) {
+): Promise<CalendarList> {
   const calendars = await api
     .get(`dav/calendars/${userId}.json?${scope}`, {
       headers: {
@@ -13,7 +14,7 @@ export async function getCalendars(
       signal,
     })
     .json();
-  return calendars;
+  return calendars as CalendarList;
 }
 
 export async function getCalendar(
@@ -59,7 +60,7 @@ export async function postCalendar(
 export async function addSharedCalendar(
   userId: string,
   calId: string,
-  cal: Record<string, any>
+  cal: CalendarInput
 ) {
   const response = await api.post(`dav/calendars/${userId}.json`, {
     headers: {
@@ -70,7 +71,7 @@ export async function addSharedCalendar(
       ...cal.cal,
       "dav:name":
         cal.cal["dav:name"] === "#default"
-          ? cal.owner.displayName + "'s calendar"
+          ? (cal.owner?.displayName ?? "Unknown") + "'s calendar"
           : cal.cal["dav:name"],
       "calendarserver:source": {
         acl: cal.cal.acl,
diff --git a/src/features/Calendars/services/addSharedCalendarAsync.ts b/src/features/Calendars/services/addSharedCalendarAsync.ts
index c1a6e26..fafbd75 100644
--- a/src/features/Calendars/services/addSharedCalendarAsync.ts
+++ b/src/features/Calendars/services/addSharedCalendarAsync.ts
@@ -1,7 +1,8 @@
-import { formatReduxError } from "@/utils/errorUtils";
-import { createAsyncThunk } from "@reduxjs/toolkit";
 import { getUserDetails } from "@/features/User/userAPI";
+import { toRejectedError } from "@/utils/errorUtils";
+import { createAsyncThunk } from "@reduxjs/toolkit";
 import { addSharedCalendar } from "../CalendarApi";
+import { CalendarInput } from "../types/CalendarData";
 import { RejectedError } from "../types/RejectedError";
 
 export const addSharedCalendarAsync = createAsyncThunk<
@@ -14,14 +15,14 @@ export const addSharedCalendarAsync = createAsyncThunk<
     owner: string;
     ownerEmails: string[];
   },
-  { userId: string; calId: string; cal: Record<string, any> },
+  { userId: string; calId: string; cal: CalendarInput },
   { rejectValue: RejectedError }
 >(
   "calendars/addSharedCalendar",
   async ({ userId, calId, cal }, { rejectWithValue }) => {
     try {
       await addSharedCalendar(userId, calId, cal);
-      const ownerData: any = await getUserDetails(
+      const ownerData = await getUserDetails(
         cal.cal._links.self.href
           .replace("/calendars/", "")
           .replace(".json", "")
@@ -29,28 +30,25 @@ export const addSharedCalendarAsync = createAsyncThunk<
       );
 
       return {
-        calId: cal.cal._links.self.href
-          .replace("/calendars/", "")
+        calId: cal.cal._links.self?.href
+          ?.replace("/calendars/", "")
           .replace(".json", ""),
         color: cal.color,
         link: `/calendars/${userId}/${calId}.json`,
-        desc: cal.cal["caldav:description"],
+        desc: cal.cal["caldav:description"] ?? "",
         name:
           ownerData.id !== userId && cal.cal["dav:name"] === "#default"
             ? `${ownerData.firstname ? `${ownerData.firstname} ` : ""}${
-                ownerData.lastname
+                ownerData.lastname ?? ""
               }` + "'s calendar"
-            : cal.cal["dav:name"],
+            : (cal.cal["dav:name"] ?? ""),
         owner: `${ownerData.firstname ? `${ownerData.firstname} ` : ""}${
-          ownerData.lastname
+          ownerData.lastname ?? ""
         }`,
         ownerEmails: ownerData.emails,
       };
-    } catch (err: any) {
-      return rejectWithValue({
-        message: formatReduxError(err),
-        status: err.response?.status,
-      });
+    } catch (err) {
+      return rejectWithValue(toRejectedError(err));
     }
   }
 );
diff --git a/src/features/Calendars/services/createCalendarAsync.ts b/src/features/Calendars/services/createCalendarAsync.ts
index 9a3e11d..e116899 100644
--- a/src/features/Calendars/services/createCalendarAsync.ts
+++ b/src/features/Calendars/services/createCalendarAsync.ts
@@ -1,6 +1,5 @@
-import { getUserDetails } from "@/features/User/userAPI";
 import { userData } from "@/features/User/userDataTypes";
-import { formatReduxError } from "@/utils/errorUtils";
+import { toRejectedError } from "@/utils/errorUtils";
 import { createAsyncThunk } from "@reduxjs/toolkit";
 import { postCalendar } from "../CalendarApi";
 import { RejectedError } from "../types/RejectedError";
@@ -45,11 +44,8 @@ export const createCalendarAsync = createAsyncThunk<
         owner,
         ownerEmails: userData.email ? [userData.email] : [],
       };
-    } catch (err: any) {
-      return rejectWithValue({
-        message: formatReduxError(err),
-        status: err.response?.status,
-      });
+    } catch (err) {
+      return rejectWithValue(toRejectedError(err));
     }
   }
 );
diff --git a/src/features/Calendars/services/deleteEventAsync.ts b/src/features/Calendars/services/deleteEventAsync.ts
index 2b59750..0169338 100644
--- a/src/features/Calendars/services/deleteEventAsync.ts
+++ b/src/features/Calendars/services/deleteEventAsync.ts
@@ -1,5 +1,5 @@
 import { deleteEvent } from "@/features/Events/EventApi";
-import { formatReduxError } from "@/utils/errorUtils";
+import { toRejectedError } from "@/utils/errorUtils";
 import { createAsyncThunk } from "@reduxjs/toolkit";
 import { RejectedError } from "../types/RejectedError";
 
@@ -13,11 +13,8 @@ export const deleteEventAsync = createAsyncThunk<
     try {
       await deleteEvent(eventURL);
       return { calId, eventId };
-    } catch (err: any) {
-      return rejectWithValue({
-        message: formatReduxError(err),
-        status: err.response?.status,
-      });
+    } catch (err) {
+      return rejectWithValue(toRejectedError(err));
     }
   }
 );
diff --git a/src/features/Calendars/services/deleteEventInstanceAsync.ts b/src/features/Calendars/services/deleteEventInstanceAsync.ts
index 4a8b8a0..f188b4b 100644
--- a/src/features/Calendars/services/deleteEventInstanceAsync.ts
+++ b/src/features/Calendars/services/deleteEventInstanceAsync.ts
@@ -11,12 +11,13 @@ export const deleteEventInstanceAsync = createAsyncThunk<
   { rejectValue: RejectedError }
 >("calendars/delEventInstance", async ({ cal, event }, { rejectWithValue }) => {
   try {
-    await deleteEventInstance(event, cal.ownerEmails?.[0]);
+    await deleteEventInstance(event);
     return { calId: cal.id, eventId: event.uid };
-  } catch (err: any) {
+  } catch (err) {
+    const error = err as { response?: { status?: number } };
     return rejectWithValue({
       message: formatReduxError(err),
-      status: err.response?.status,
+      status: error.response?.status,
     });
   }
 });
diff --git a/src/features/Calendars/services/getCalendarDetailAsync.ts b/src/features/Calendars/services/getCalendarDetailAsync.ts
index d25d264..0765524 100644
--- a/src/features/Calendars/services/getCalendarDetailAsync.ts
+++ b/src/features/Calendars/services/getCalendarDetailAsync.ts
@@ -1,9 +1,14 @@
 import { CalendarEvent } from "@/features/Events/EventsTypes";
-import { formatReduxError } from "@/utils/errorUtils";
+import {
+  CalendarData,
+  CalendarItem,
+} from "@/features/Calendars/types/CalendarData";
+import { toRejectedError } from "@/utils/errorUtils";
 import { createAsyncThunk } from "@reduxjs/toolkit";
 import { getCalendar } from "../CalendarApi";
 import { RejectedError } from "../types/RejectedError";
 import { extractCalendarEvents } from "../utils/extractCalendarEvents";
+import { defaultColors } from "@/components/Calendar/utils/calendarColorsUtils";
 
 export const getCalendarDetailAsync = createAsyncThunk<
   {
@@ -23,24 +28,27 @@ export const getCalendarDetailAsync = createAsyncThunk<
   "calendars/getCalendarDetails",
   async ({ calId, match, calType, signal }, { rejectWithValue }) => {
     try {
-      const calendar = (await getCalendar(calId, match, signal)) as any;
+      const calendar = (await getCalendar(
+        calId,
+        match,
+        signal
+      )) as CalendarData;
 
-      const color = calendar["apple:color"];
+      const color = calendar["apple:color"]
+        ? { light: calendar["apple:color"], dark: calendar["apple:color"] }
+        : defaultColors[0];
       const syncToken = calendar._embedded?.["sync-token"];
 
       const items = calendar._embedded?.["dav:item"];
       const events: CalendarEvent[] = Array.isArray(items)
-        ? items.flatMap((item: any) =>
+        ? items.flatMap((item: CalendarItem) =>
             extractCalendarEvents(item, { calId, color })
           )
         : [];
 
       return { calId, events, calType, syncToken };
-    } catch (err: any) {
-      return rejectWithValue({
-        message: formatReduxError(err),
-        status: err.response?.status,
-      });
+    } catch (err) {
+      return rejectWithValue(toRejectedError(err));
     }
   }
 );
diff --git a/src/features/Calendars/services/getCalendarsListAsync.ts b/src/features/Calendars/services/getCalendarsListAsync.ts
index 8d50805..0667843 100644
--- a/src/features/Calendars/services/getCalendarsListAsync.ts
+++ b/src/features/Calendars/services/getCalendarsListAsync.ts
@@ -1,32 +1,33 @@
+import { RootState } from "@/app/store";
+import { OpenPaasUserData } from "@/features/User/type/OpenPaasUserData";
 import { getOpenPaasUser, getUserDetails } from "@/features/User/userAPI";
 import { formatReduxError } from "@/utils/errorUtils";
 import { createAsyncThunk } from "@reduxjs/toolkit";
 import { getCalendars } from "../CalendarApi";
-import { RejectedError } from "../types/RejectedError";
 import { Calendar } from "../CalendarTypes";
+import { CalendarData } from "../types/CalendarData";
+import { RejectedError } from "../types/RejectedError";
 import { normalizeCalendar } from "../utils/normalizeCalendar";
 
 export const getCalendarsListAsync = createAsyncThunk<
   { importedCalendars: Record<string, Calendar>; errors: string },
   void,
-  { rejectValue: RejectedError; state: any }
+  { rejectValue: RejectedError; state: RootState }
 >("calendars/getCalendars", async (_, { rejectWithValue, getState }) => {
-  const state = getState() as any;
+  const state = getState();
   const existingCalendars = state.calendars.list || {};
   const existingUser = { id: state.user?.userData?.openpaasId || undefined };
   try {
     const fetchedCalendars: Record<string, Calendar> = {};
     const user = existingUser.id
       ? existingUser
-      : ((await getOpenPaasUser()) as Record<string, string>);
-    const calendars = (await getCalendars(user.id)) as Record<string, any>;
-    const rawCalendars = calendars._embedded["dav:calendar"] as Record<
-      string,
-      any
-    >[];
+      : ((await getOpenPaasUser()) as OpenPaasUserData);
+    const calendars = await getCalendars(user.id);
+    const rawCalendars = calendars._embedded["dav:calendar"];
+
     const errors: string[] = [];
 
-    const normalizedCalendars = rawCalendars.map((cal) =>
+    const normalizedCalendars = rawCalendars.map((cal: CalendarData) =>
       normalizeCalendar(cal)
     );
 
@@ -34,14 +35,14 @@ export const getCalendarsListAsync = createAsyncThunk<
       new Set(normalizedCalendars.map(({ ownerId }) => ownerId).filter(Boolean))
     );
 
-    const ownerDataMap = new Map<string, any>();
+    const ownerDataMap = new Map<string, OpenPaasUserData>();
     const OWNER_BATCH_SIZE = 20;
 
     const fetchOwnerData = async (ownerId: string) => {
       try {
         const data = await getUserDetails(ownerId);
         ownerDataMap.set(ownerId, data);
-      } catch (error: any) {
+      } catch (error) {
         console.error(`Failed to fetch user details for ${ownerId}:`, error);
         ownerDataMap.set(ownerId, {
           firstname: "",
@@ -72,7 +73,7 @@ export const getCalendarsListAsync = createAsyncThunk<
 
         const color = {
           light: cal["apple:color"] ?? "#006BD8",
-          dark: cal["X-TWAKE-Dark-theme-color"] ?? "#FFF",
+          dark: "#FFF",
         };
         fetchedCalendars[id] = {
           id,
@@ -120,10 +121,11 @@ export const getCalendarsListAsync = createAsyncThunk<
       importedCalendars,
       errors: errors.join("\n"),
     };
-  } catch (err: any) {
+  } catch (err) {
+    const error = err as { response?: { status?: number } };
     return rejectWithValue({
       message: formatReduxError(err),
-      status: err.response?.status,
+      status: error.response?.status,
     });
   }
 });
diff --git a/src/features/Calendars/services/getEventAsync.ts b/src/features/Calendars/services/getEventAsync.ts
index b0f6e37..a115684 100644
--- a/src/features/Calendars/services/getEventAsync.ts
+++ b/src/features/Calendars/services/getEventAsync.ts
@@ -15,10 +15,11 @@ export const getEventAsync = createAsyncThunk<
       calId: event.calId,
       event: response,
     };
-  } catch (err: any) {
+  } catch (err) {
+    const error = err as { response?: { status?: number } };
     return rejectWithValue({
       message: formatReduxError(err),
-      status: err.response?.status,
+      status: error.response?.status,
     });
   }
 });
diff --git a/src/features/Calendars/services/getTempCalendarsListAsync.ts b/src/features/Calendars/services/getTempCalendarsListAsync.ts
index 2ef35db..8b9dc3b 100644
--- a/src/features/Calendars/services/getTempCalendarsListAsync.ts
+++ b/src/features/Calendars/services/getTempCalendarsListAsync.ts
@@ -4,8 +4,8 @@ import { getUserDetails } from "@/features/User/userAPI";
 import { formatReduxError } from "@/utils/errorUtils";
 import { createAsyncThunk } from "@reduxjs/toolkit";
 import { getCalendars } from "../CalendarApi";
-import { RejectedError } from "../types/RejectedError";
 import { Calendar } from "../CalendarTypes";
+import { RejectedError } from "../types/RejectedError";
 
 export const getTempCalendarsListAsync = createAsyncThunk<
   Record<string, Calendar>,
@@ -20,10 +20,10 @@ export const getTempCalendarsListAsync = createAsyncThunk<
         `TRANSLATION:calendar.userDoesNotHaveValidId|name=${encodeURIComponent(username)}`
       );
     }
-    const calendars = (await getCalendars(
+    const calendars = await getCalendars(
       tempUser.openpaasId,
       "sharedPublic=true&"
-    )) as Record<string, any>;
+    );
 
     const rawCalendars = calendars._embedded?.["dav:calendar"];
     if (!rawCalendars || rawCalendars.length === 0) {
@@ -36,17 +36,20 @@ export const getTempCalendarsListAsync = createAsyncThunk<
     }
 
     for (const cal of rawCalendars) {
-      const name = cal["dav:name"];
-      const description = cal["caldav:description"];
+      const name = cal["dav:name"] ?? "";
+      const description = cal["caldav:description"] ?? "";
       const delegated = cal["calendarserver:delegatedsource"] ? true : false;
       const source = cal["calendarserver:source"]
-        ? cal["calendarserver:source"]._links.self.href
-        : cal._links.self.href;
-      const link = cal._links.self.href;
+        ? cal["calendarserver:source"]._links.self?.href
+        : cal._links.self?.href;
+      if (!source) {
+        throw new Error("No source for calendar");
+      }
+      const link = cal._links.self?.href ?? "";
 
       const id = source.replace("/calendars/", "").replace(".json", "");
-      const visibility = getCalendarVisibility(cal["acl"]);
-      const ownerData: any = await getUserDetails(id.split("/")[0]);
+      const visibility = getCalendarVisibility(cal["acl"] ?? []);
+      const ownerData = await getUserDetails(id.split("/")[0]);
 
       importedCalendars[id] = {
         id,
@@ -66,10 +69,11 @@ export const getTempCalendarsListAsync = createAsyncThunk<
     }
 
     return importedCalendars;
-  } catch (err: any) {
+  } catch (err) {
+    const error = err as { response?: { status?: number } };
     return rejectWithValue({
       message: formatReduxError(err),
-      status: err.response?.status,
+      status: error.response?.status,
     });
   }
 });
diff --git a/src/features/Calendars/services/importEventFromFileAsync.ts b/src/features/Calendars/services/importEventFromFileAsync.ts
index 47f3843..a5d1289 100644
--- a/src/features/Calendars/services/importEventFromFileAsync.ts
+++ b/src/features/Calendars/services/importEventFromFileAsync.ts
@@ -22,10 +22,11 @@ export const importEventFromFileAsync = createAsyncThunk<
       });
     }
     await importEventFromFile(id, calLink);
-  } catch (err: any) {
+  } catch (err) {
+    const error = err as { response?: { status?: number } };
     return rejectWithValue({
       message: formatReduxError(err),
-      status: err.response?.status,
+      status: error.response?.status,
     });
   }
 });
diff --git a/src/features/Calendars/services/moveEventAsync.ts b/src/features/Calendars/services/moveEventAsync.ts
index 1268196..ac0ae13 100644
--- a/src/features/Calendars/services/moveEventAsync.ts
+++ b/src/features/Calendars/services/moveEventAsync.ts
@@ -1,15 +1,9 @@
 import { moveEvent } from "@/features/Events/EventApi";
 import { CalendarEvent } from "@/features/Events/EventsTypes";
-import { parseCalendarEvent } from "@/features/Events/eventUtils";
-import {
-  computeWeekRange,
-  formatDateToYYYYMMDDTHHMMSS,
-} from "@/utils/dateUtils";
-import { formatReduxError } from "@/utils/errorUtils";
+import { toRejectedError } from "@/utils/errorUtils";
 import { createAsyncThunk } from "@reduxjs/toolkit";
-import { getCalendar } from "../CalendarApi";
-import { RejectedError } from "../types/RejectedError";
 import { Calendar } from "../CalendarTypes";
+import { RejectedError } from "../types/RejectedError";
 
 export const moveEventAsync = createAsyncThunk<
   { calId: string },
@@ -24,11 +18,8 @@ export const moveEventAsync = createAsyncThunk<
       return {
         calId: cal.id,
       };
-    } catch (err: any) {
-      return rejectWithValue({
-        message: formatReduxError(err),
-        status: err.response?.status,
-      });
+    } catch (err) {
+      return rejectWithValue(toRejectedError(err));
     }
   }
 );
diff --git a/src/features/Calendars/services/patchACLCalendarAsync.ts b/src/features/Calendars/services/patchACLCalendarAsync.ts
index 1c939e2..f94aca5 100644
--- a/src/features/Calendars/services/patchACLCalendarAsync.ts
+++ b/src/features/Calendars/services/patchACLCalendarAsync.ts
@@ -1,4 +1,4 @@
-import { formatReduxError } from "@/utils/errorUtils";
+import { toRejectedError } from "@/utils/errorUtils";
 import { createAsyncThunk } from "@reduxjs/toolkit";
 import { updateAclCalendar } from "../CalendarApi";
 import { RejectedError } from "../types/RejectedError";
@@ -25,11 +25,8 @@ export const patchACLCalendarAsync = createAsyncThunk<
         calLink,
         request,
       };
-    } catch (err: any) {
-      return rejectWithValue({
-        message: formatReduxError(err),
-        status: err.response?.status,
-      });
+    } catch (err) {
+      return rejectWithValue(toRejectedError(err));
     }
   }
 );
diff --git a/src/features/Calendars/services/patchCalendarAsync.ts b/src/features/Calendars/services/patchCalendarAsync.ts
index 4c94f1f..ce7cb59 100644
--- a/src/features/Calendars/services/patchCalendarAsync.ts
+++ b/src/features/Calendars/services/patchCalendarAsync.ts
@@ -1,4 +1,4 @@
-import { formatReduxError } from "@/utils/errorUtils";
+import { toRejectedError } from "@/utils/errorUtils";
 import { createAsyncThunk } from "@reduxjs/toolkit";
 import { proppatchCalendar } from "../CalendarApi";
 import { RejectedError } from "../types/RejectedError";
@@ -25,11 +25,8 @@ export const patchCalendarAsync = createAsyncThunk<
         calLink,
         patch,
       };
-    } catch (err: any) {
-      return rejectWithValue({
-        message: formatReduxError(err),
-        status: err.response?.status,
-      });
+    } catch (err) {
+      return rejectWithValue(toRejectedError(err));
     }
   }
 );
diff --git a/src/features/Calendars/services/putEventAsync.ts b/src/features/Calendars/services/putEventAsync.ts
index 8ba1c03..3bdd7e3 100644
--- a/src/features/Calendars/services/putEventAsync.ts
+++ b/src/features/Calendars/services/putEventAsync.ts
@@ -1,9 +1,9 @@
 import { putEvent } from "@/features/Events/EventApi";
 import { CalendarEvent } from "@/features/Events/EventsTypes";
-import { formatReduxError } from "@/utils/errorUtils";
+import { toRejectedError } from "@/utils/errorUtils";
 import { createAsyncThunk } from "@reduxjs/toolkit";
-import { RejectedError } from "../types/RejectedError";
 import { Calendar } from "../CalendarTypes";
+import { RejectedError } from "../types/RejectedError";
 
 export const putEventAsync = createAsyncThunk<
   { calId: string; calType?: "temp" },
@@ -22,11 +22,8 @@ export const putEventAsync = createAsyncThunk<
         calId: cal.id,
         calType,
       };
-    } catch (err: any) {
-      return rejectWithValue({
-        message: formatReduxError(err),
-        status: err.response?.status,
-      });
+    } catch (err) {
+      return rejectWithValue(toRejectedError(err));
     }
   }
 );
diff --git a/src/features/Calendars/services/refreshCalendar.ts b/src/features/Calendars/services/refreshCalendar.ts
index 7b8aa72..f406d09 100644
--- a/src/features/Calendars/services/refreshCalendar.ts
+++ b/src/features/Calendars/services/refreshCalendar.ts
@@ -1,10 +1,10 @@
 import { CalendarEvent } from "@/features/Events/EventsTypes";
-import { formatReduxError } from "@/utils/errorUtils";
+import { toRejectedError } from "@/utils/errorUtils";
 import { createAsyncThunk } from "@reduxjs/toolkit";
 import pMap from "p-map";
 import { fetchSyncTokenChanges } from "../api/fetchSyncTokenChanges";
-import { RejectedError } from "../types/RejectedError";
 import { Calendar } from "../CalendarTypes";
+import { RejectedError } from "../types/RejectedError";
 import { expandEventFunction } from "../utils/expandEventFunction";
 import { processSyncUpdates } from "../utils/processSyncTokenUpdates";
 
@@ -70,11 +70,8 @@ export const refreshCalendarWithSyncToken = createAsyncThunk<
         syncToken: newSyncToken,
         syncStatus: newSyncToken ? "SUCCESS" : "NO_NEW_SYNC_TOKEN",
       };
-    } catch (err: any) {
-      return rejectWithValue({
-        message: formatReduxError(err),
-        status: err.response?.status,
-      });
+    } catch (err) {
+      return rejectWithValue(toRejectedError(err));
     }
   }
 );
diff --git a/src/features/Calendars/services/removeCalendarAsync.ts b/src/features/Calendars/services/removeCalendarAsync.ts
index cb51a96..077e074 100644
--- a/src/features/Calendars/services/removeCalendarAsync.ts
+++ b/src/features/Calendars/services/removeCalendarAsync.ts
@@ -1,4 +1,4 @@
-import { formatReduxError } from "@/utils/errorUtils";
+import { toRejectedError } from "@/utils/errorUtils";
 import { createAsyncThunk } from "@reduxjs/toolkit";
 import { removeCalendar } from "../CalendarApi";
 import { RejectedError } from "../types/RejectedError";
@@ -20,11 +20,8 @@ export const removeCalendarAsync = createAsyncThunk<
       return {
         calId,
       };
-    } catch (err: any) {
-      return rejectWithValue({
-        message: formatReduxError(err),
-        status: err.response?.status,
-      });
+    } catch (err) {
+      return rejectWithValue(toRejectedError(err));
     }
   }
 );
diff --git a/src/features/Calendars/services/updateEventInstanceAsync.ts b/src/features/Calendars/services/updateEventInstanceAsync.ts
index 6f8a5ee..40176b5 100644
--- a/src/features/Calendars/services/updateEventInstanceAsync.ts
+++ b/src/features/Calendars/services/updateEventInstanceAsync.ts
@@ -1,6 +1,6 @@
 import { putEventWithOverrides } from "@/features/Events/EventApi";
 import { CalendarEvent } from "@/features/Events/EventsTypes";
-import { formatReduxError } from "@/utils/errorUtils";
+import { toRejectedError } from "@/utils/errorUtils";
 import { createAsyncThunk } from "@reduxjs/toolkit";
 import { RejectedError } from "../types/RejectedError";
 import { Calendar } from "../CalendarTypes";
@@ -15,11 +15,8 @@ export const updateEventInstanceAsync = createAsyncThunk<
     try {
       await putEventWithOverrides(event, cal.ownerEmails?.[0]);
       return { calId: cal.id, event };
-    } catch (err: any) {
-      return rejectWithValue({
-        message: formatReduxError(err),
-        status: err.response?.status,
-      });
+    } catch (err) {
+      return rejectWithValue(toRejectedError(err));
     }
   }
 );
diff --git a/src/features/Calendars/services/updateSeriesAsync.ts b/src/features/Calendars/services/updateSeriesAsync.ts
index 39ac5a7..8eed05a 100644
--- a/src/features/Calendars/services/updateSeriesAsync.ts
+++ b/src/features/Calendars/services/updateSeriesAsync.ts
@@ -1,9 +1,9 @@
 import { updateSeries } from "@/features/Events/EventApi";
 import { CalendarEvent } from "@/features/Events/EventsTypes";
-import { formatReduxError } from "@/utils/errorUtils";
+import { toRejectedError } from "@/utils/errorUtils";
 import { createAsyncThunk } from "@reduxjs/toolkit";
-import { RejectedError } from "../types/RejectedError";
 import { Calendar } from "../CalendarTypes";
+import { RejectedError } from "../types/RejectedError";
 
 export const updateSeriesAsync = createAsyncThunk<
   void,
@@ -14,11 +14,8 @@ export const updateSeriesAsync = createAsyncThunk<
   async ({ cal, event, removeOverrides = true }, { rejectWithValue }) => {
     try {
       await updateSeries(event, cal.ownerEmails?.[0] ?? "", removeOverrides);
-    } catch (err: any) {
-      return rejectWithValue({
-        message: formatReduxError(err),
-        status: err.response?.status,
-      });
+    } catch (err) {
+      return rejectWithValue(toRejectedError(err));
     }
   }
 );
diff --git a/src/features/Calendars/types/AsyncThunkResult.ts b/src/features/Calendars/types/AsyncThunkResult.ts
new file mode 100644
index 0000000..3768c26
--- /dev/null
+++ b/src/features/Calendars/types/AsyncThunkResult.ts
@@ -0,0 +1,7 @@
+// Type for async thunk results
+export interface AsyncThunkResult {
+  type: string;
+  error?: { message?: string };
+  payload?: { message?: string };
+  unwrap?: () => Promise<unknown>;
+}
diff --git a/src/features/Calendars/types/CalendarData.ts b/src/features/Calendars/types/CalendarData.ts
new file mode 100644
index 0000000..705d262
--- /dev/null
+++ b/src/features/Calendars/types/CalendarData.ts
@@ -0,0 +1,90 @@
+import { User } from "@/components/Attendees/PeopleSearch";
+import { CalDavLink } from "../api/types";
+
+// Access control entry
+export interface AclEntry {
+  privilege: string;
+  principal: string;
+  protected: boolean;
+}
+
+// VObject property value can be various types
+export type VObjectValue =
+  | string
+  | number
+  | boolean
+  | Date
+  | Record<string, unknown>
+  | null
+  | RepetitionRule
+  | undefined;
+
+// VObject property tuple
+export type VObjectProperty = [
+  string,
+  Record<string, unknown>,
+  string | Array<unknown>,
+  VObjectValue,
+];
+
+export type VCalComponent = [
+  string,
+  VObjectProperty[],
+  VCalComponent[],
+  ...unknown[],
+];
+
+export interface Organizer {
+  cn?: string;
+  email: string;
+}
+
+// The `dav:item` object in _embedded
+export interface CalendarItem {
+  _links: CalDavLink;
+  etag: string;
+  status: number;
+  data: [
+    "vcalendar",
+    Array<
+      VObjectProperty | [string, VObjectProperty[], unknown[]] // vevent array
+    >,
+  ];
+}
+
+// Main calendar data
+export interface CalendarData {
+  _links: CalDavLink;
+  "caldav:description"?: string;
+  "dav:name"?: string;
+  "apple:color"?: string;
+  id?: string;
+  acl?: AclEntry[];
+  invite?: unknown;
+  _embedded: {
+    "sync-token": string;
+    "dav:item": CalendarItem[];
+  };
+  "calendarserver:source"?: { _links: CalDavLink };
+  "calendarserver:delegatedsource"?: string;
+}
+
+export interface CalendarList {
+  _embedded: { "dav:calendar": CalendarData[] };
+}
+
+// Calendar input for forms or UI
+export interface CalendarInput {
+  cal: CalendarData;
+  color: Record<string, string>;
+  owner?: User;
+}
+
+// Vevent repetition rule
+export interface RepetitionRule {
+  freq: string;
+  interval?: number;
+  count?: number;
+  until?: string;
+  byday?: string | string[];
+}
diff --git a/src/features/Calendars/utils/expandEventFunction.ts b/src/features/Calendars/utils/expandEventFunction.ts
index eac2893..84da10a 100644
--- a/src/features/Calendars/utils/expandEventFunction.ts
+++ b/src/features/Calendars/utils/expandEventFunction.ts
@@ -20,7 +20,7 @@ export function expandEventFunction(
       });
       return events;
     } catch (err) {
-      console.error("Failed to fetch event", eventUrl);
+      console.error("Failed to fetch event", eventUrl, err);
       return undefined;
     }
   };
diff --git a/src/features/Calendars/utils/extractCalendarEvents.ts b/src/features/Calendars/utils/extractCalendarEvents.ts
index 9acbb20..a301756 100644
--- a/src/features/Calendars/utils/extractCalendarEvents.ts
+++ b/src/features/Calendars/utils/extractCalendarEvents.ts
@@ -2,6 +2,7 @@ import { defaultColors } from "@/components/Calendar/utils/calendarColorsUtils";
 import { CalendarEvent } from "@/features/Events/EventsTypes";
 import { parseCalendarEvent } from "@/features/Events/eventUtils";
 import { CalDavItem } from "../api/types";
+import { VCalComponent } from "../types/CalendarData";
 
 export function extractCalendarEvents(
   item: CalDavItem,
@@ -50,7 +51,7 @@ export function extractCalendarEvents(
     .filter(Boolean) as CalendarEvent[];
 }
 
-function extractValarm(vevent: any[]) {
+function extractValarm(vevent: VCalComponent[]) {
   const subComponents = vevent[2];
   if (!Array.isArray(subComponents)) {
     return undefined;
diff --git a/src/features/Calendars/utils/normalizeCalendar.ts b/src/features/Calendars/utils/normalizeCalendar.ts
index 37fc541..3cd6ef0 100644
--- a/src/features/Calendars/utils/normalizeCalendar.ts
+++ b/src/features/Calendars/utils/normalizeCalendar.ts
@@ -1,19 +1,23 @@
 import { getCalendarVisibility } from "@/components/Calendar/utils/calendarUtils";
+import { CalendarData } from "../types/CalendarData";
 
-export function normalizeCalendar(rawCalendar: Record<string, any>) {
+export function normalizeCalendar(rawCalendar: CalendarData) {
   const description = rawCalendar["caldav:description"];
   let delegated = false;
   let source = rawCalendar["calendarserver:source"]
-    ? rawCalendar["calendarserver:source"]._links.self.href
-    : rawCalendar._links.self.href;
-  const link = rawCalendar._links.self.href;
+    ? rawCalendar["calendarserver:source"]._links.self?.href
+    : rawCalendar._links.self?.href;
+  const link = rawCalendar._links.self?.href;
   if (rawCalendar["calendarserver:delegatedsource"]) {
     source = rawCalendar["calendarserver:delegatedsource"];
     delegated = true;
   }
+  if (!source) {
+    throw new Error("No source for calendar");
+  }
   const id = source.replace("/calendars/", "").replace(".json", "");
   const ownerId = id.split("/")[0];
-  const visibility = getCalendarVisibility(rawCalendar["acl"]);
+  const visibility = getCalendarVisibility(rawCalendar["acl"] ?? []);
   return {
     cal: rawCalendar,
     description,
diff --git a/src/features/Calendars/utils/processSyncTokenUpdates.ts b/src/features/Calendars/utils/processSyncTokenUpdates.ts
index eb21373..c249cf3 100644
--- a/src/features/Calendars/utils/processSyncTokenUpdates.ts
+++ b/src/features/Calendars/utils/processSyncTokenUpdates.ts
@@ -30,6 +30,6 @@ export function processSyncUpdates(
 }
 
 function extractFileNameFromHref(href: string): string {
-  const fileNameMatch = href.match(/\/([^\/]+)\.ics$/); // CalDAV href are like /calendars/userID/CalendarID/EventId.ics
+  const fileNameMatch = href.match(/\/([^/]+)\.ics$/); // CalDAV href are like /calendars/userID/CalendarID/EventId.ics
   return fileNameMatch ? fileNameMatch[1] : href;
 }
diff --git a/src/features/Events/AttendanceValidation/AttendanceValidation.tsx b/src/features/Events/AttendanceValidation/AttendanceValidation.tsx
index 3f0d7b0..37691f3 100644
--- a/src/features/Events/AttendanceValidation/AttendanceValidation.tsx
+++ b/src/features/Events/AttendanceValidation/AttendanceValidation.tsx
@@ -9,7 +9,9 @@ import { PartStat } from "@/features/User/models/attendee";
 interface AttendanceValidationProps {
   contextualizedEvent: ContextualizedEvent;
   user: userData | undefined;
-  setAfterChoiceFunc: Dispatch<SetStateAction<Function | undefined>>;
+  setAfterChoiceFunc: (
+    func: ((type: "solo" | "all" | undefined) => void) | undefined
+  ) => void;
   setOpenEditModePopup: Dispatch<SetStateAction<string | null>>;
 }
 
diff --git a/src/features/Events/AttendanceValidation/RSVPButton.tsx b/src/features/Events/AttendanceValidation/RSVPButton.tsx
index ef21582..10a5b31 100644
--- a/src/features/Events/AttendanceValidation/RSVPButton.tsx
+++ b/src/features/Events/AttendanceValidation/RSVPButton.tsx
@@ -1,8 +1,8 @@
 import { useAppDispatch } from "@/app/hooks";
 import { PartStat } from "@/features/User/models/attendee";
 import { userData } from "@/features/User/userDataTypes";
-import { Button, CircularProgress, Box, Theme } from "@linagora/twake-mui";
-import { Dispatch, SetStateAction, useEffect, useRef, useState } from "react";
+import { Box, Button, CircularProgress, Theme } from "@linagora/twake-mui";
+import { Dispatch, SetStateAction, useEffect, useRef } from "react";
 import { useI18n } from "twake-i18n";
 import { ContextualizedEvent } from "../EventsTypes";
 import { handleRSVPClick } from "./handleRSVPClick";
@@ -19,7 +19,9 @@ interface RSVPButtonProps {
   rsvpValue: PartStat;
   contextualizedEvent: ContextualizedEvent;
   user: userData | undefined;
-  setAfterChoiceFunc: Dispatch<SetStateAction<Function | undefined>>;
+  setAfterChoiceFunc: (
+    func: ((type: "solo" | "all" | undefined) => void) | undefined
+  ) => void;
   setOpenEditModePopup: Dispatch<SetStateAction<string | null>>;
   isLoading: boolean;
   onLoadingChange: (loading: boolean, value?: PartStat) => void;
diff --git a/src/features/Events/AttendanceValidation/handleRSVPClick.tsx b/src/features/Events/AttendanceValidation/handleRSVPClick.tsx
index 2a9a9c9..0709280 100644
--- a/src/features/Events/AttendanceValidation/handleRSVPClick.tsx
+++ b/src/features/Events/AttendanceValidation/handleRSVPClick.tsx
@@ -9,7 +9,9 @@ export async function handleRSVPClick(
   rsvp: PartStat,
   contextualizedEvent: ContextualizedEvent,
   user: userData | undefined,
-  setAfterChoiceFunc: Dispatch<SetStateAction<Function | undefined>>,
+  setAfterChoiceFunc: (
+    func: ((type: "solo" | "all" | undefined) => void) | undefined
+  ) => void,
   setOpenEditModePopup: Dispatch<SetStateAction<string | null>>,
   dispatch: AppDispatch,
   onLoadingChange?: (loading: boolean, value?: PartStat) => void
diff --git a/src/features/Events/EventApi.ts b/src/features/Events/EventApi.ts
index c74eb09..238f399 100644
--- a/src/features/Events/EventApi.ts
+++ b/src/features/Events/EventApi.ts
@@ -3,6 +3,7 @@ import { resolveTimezoneId, convertEventDateTimeToISO } from "@/utils/timezone";
 import { TIMEZONES } from "@/utils/timezone-data";
 import ICAL from "ical.js";
 import { CalDavItem } from "../Calendars/api/types";
+import { SearchEventsResponse } from "../Search/types/SearchEventsResponse";
 import { CalendarEvent } from "./EventsTypes";
 import {
   calendarEventToJCal,
@@ -11,6 +12,23 @@ import {
   parseCalendarEvent,
 } from "./eventUtils";
 
+type JCalValue = string | number | boolean | null;
+
+type JCalParams = Record<string, JCalValue | JCalValue[]>;
+
+type JCalProperty = [
+  name: string,
+  params: JCalParams,
+  type: string,
+  value: JCalValue,
+];
+
+type JCalComponent = [
+  name: string,
+  properties: JCalProperty[],
+  components?: JCalComponent[],
+];
+
 export async function reportEvent(
   event: CalendarEvent,
   match: { start: string; end: string }
@@ -43,8 +61,8 @@ export async function getEvent(event: CalendarEvent, isMaster?: boolean) {
   let targetVevent;
   if (isMaster) {
     targetVevent = vevents.find(
-      ([, props]: [string, any[]]) =>
-        !props.find(([k]: string[]) => k.toLowerCase() === "recurrence-id")
+      ([, props]: JCalComponent) =>
+        !props.find(([k]) => k.toLowerCase() === "recurrence-id")
     );
     if (!targetVevent) {
       targetVevent = vevents[0];
@@ -152,7 +170,7 @@ export async function putEvent(event: CalendarEvent, calOwnerEmail?: string) {
   });
 
   if (response.status === 201) {
-    console.log("Event created successfully:", response.url || event.URL);
+    console.info("Event created successfully:", response.url || event.URL);
   }
 
   return response;
@@ -198,17 +216,14 @@ export async function putEventWithOverrides(
   });
 }
 
-export const deleteEventInstance = async (
-  event: CalendarEvent,
-  calOwnerEmail?: string
-) => {
+export const deleteEventInstance = async (event: CalendarEvent) => {
   // Get all VEVENTs (master + overrides) from the series
   const vevents = await getAllRecurrentEvent(event);
 
   // Find the master VEVENT
   const masterIndex = vevents.findIndex(
-    ([, props]: [string, any[]]) =>
-      !props.find(([k]: string[]) => k.toLowerCase() === "recurrence-id")
+    ([, props]: JCalComponent) =>
+      !props.find(([k]) => k.toLowerCase() === "recurrence-id")
   );
 
   if (masterIndex === -1) {
@@ -220,8 +235,9 @@ export const deleteEventInstance = async (
   const masterProps = vevents[masterIndex][1];
 
   // Check if this date is already in EXDATE (avoid duplicates)
-  const normalizeRecurrenceId = (id: string) => (id ?? "").replace(/Z$/, "");
-  const isDuplicate = masterProps.some((prop: any[]) => {
+  const normalizeRecurrenceId = (id: JCalValue) =>
+    String(id ?? "").replace(/Z$/, "");
+  const isDuplicate = masterProps.some((prop: JCalProperty) => {
     if (prop[0].toLowerCase() === "exdate" && prop[3]) {
       return (
         normalizeRecurrenceId(prop[3]) === normalizeRecurrenceId(exdateValue)
@@ -240,9 +256,9 @@ export const deleteEventInstance = async (
   vevents[masterIndex][1] = masterProps;
 
   // Remove the override instance if it exists (in case it was an override being deleted)
-  const filteredVevents = vevents.filter(([, props]: [string, any[]]) => {
+  const filteredVevents = vevents.filter(([, props]: JCalComponent) => {
     const recurrenceIdProp = props.find(
-      ([k]: string[]) => k.toLowerCase() === "recurrence-id"
+      ([k]) => k.toLowerCase() === "recurrence-id"
     );
     if (!recurrenceIdProp) return true; // Keep master
     return (
@@ -278,9 +294,9 @@ export const updateSeriesPartstat = async (
   const vevents = await getAllRecurrentEvent(event);
 
   // Update PARTSTAT in ALL VEVENTs (master + exceptions)
-  const updatedVevents = vevents.map((vevent: any[]) => {
+  const updatedVevents = vevents.map((vevent: JCalComponent) => {
     const properties = vevent[1];
-    const updatedProperties = properties.map((prop: any[]) => {
+    const updatedProperties = properties.map((prop: JCalProperty) => {
       // Find ATTENDEE properties
       if (prop[0] === "attendee") {
         const calAddress = prop[3];
@@ -321,7 +337,7 @@ export const updateSeries = async (
 ) => {
   const vevents = await getAllRecurrentEvent(event);
   const masterIndex = vevents.findIndex(
-    ([, props]: [string, string[]]) =>
+    ([, props]: JCalComponent) =>
       !props.find(([k]) => k.toLowerCase() === "recurrence-id")
   );
   if (masterIndex === -1) {
@@ -404,7 +420,7 @@ export async function searchEvent(
     organizers: string[];
     attendees: string[];
   }
-) {
+): Promise<SearchEventsResponse> {
   const { keywords, searchIn, organizers, attendees } = filters;
 
   const reqParam: {
@@ -413,7 +429,7 @@ export async function searchEvent(
     organizers?: string[];
     attendees?: string[];
   } = {
-    query: !!keywords ? keywords : query,
+    query: keywords ? keywords : query,
     calendars: searchIn.map((calId) => {
       const [userId, calendarId] = calId.split("/");
       return { calendarId, userId };
@@ -431,5 +447,5 @@ export async function searchEvent(
     })
     .json();
 
-  return response;
+  return response as SearchEventsResponse;
 }
diff --git a/src/features/Events/EventDisplayPreview.tsx b/src/features/Events/EventDisplayPreview.tsx
index 70f058a..9b7d3ae 100644
--- a/src/features/Events/EventDisplayPreview.tsx
+++ b/src/features/Events/EventDisplayPreview.tsx
@@ -1,3 +1,4 @@
+/* eslint-disable react-hooks/rules-of-hooks */
 import { useAppDispatch, useAppSelector } from "@/app/hooks";
 import { CalendarName } from "@/components/Calendar/CalendarName";
 import { getTimezoneOffset } from "@/utils/timezone";
@@ -59,7 +60,7 @@ export default function EventPreviewModal({
   calId: string;
   tempEvent?: boolean;
   open: boolean;
-  onClose: (event: {}, reason: "backdropClick" | "escapeKeyDown") => void;
+  onClose: (event: unknown, reason: "backdropClick" | "escapeKeyDown") => void;
 }) {
   const { t } = useI18n();
   const dispatch = useAppDispatch();
@@ -67,9 +68,7 @@ export default function EventPreviewModal({
   const timezone =
     useAppSelector((state) => state.settings.timeZone) ??
     browserDefaultTimeZone;
-  const calendarList = Object.values(
-    useAppSelector((state) => state.calendars.list)
-  );
+
   const calendar = tempEvent
     ? calendars.templist[calId]
     : calendars.list[calId];
@@ -95,14 +94,16 @@ export default function EventPreviewModal({
   const [typeOfAction, setTypeOfAction] = useState<"solo" | "all" | undefined>(
     undefined
   );
-  const [afterChoiceFunc, setAfterChoiceFunc] = useState<Function>();
+  const [afterChoiceFunc, setAfterChoiceFunc] = useState<
+    ((type: "solo" | "all" | undefined) => void) | undefined
+  >();
   const attendeePreview = makeAttendeePreview(event.attendee, t);
   const hasCheckedSessionStorageRef = useRef(false);
 
   const [toggleActionMenu, setToggleActionMenu] = useState<Element | null>(
     null
   );
-  const mailSpaUrl = (window as any).MAIL_SPA_URL ?? null;
+  const mailSpaUrl = window.MAIL_SPA_URL ?? null;
 
   useEffect(() => {
     if (!event || !calendar) {
@@ -160,7 +161,7 @@ export default function EventPreviewModal({
             }
           }
         }
-      } catch (err) {
+      } catch {
         // Ignore sessionStorage errors
       }
     };
@@ -201,7 +202,7 @@ export default function EventPreviewModal({
         // Clear sessionStorage after reopening
         try {
           sessionStorage.removeItem("eventUpdateModalReopen");
-        } catch (err) {
+        } catch {
           // Ignore sessionStorage errors
         }
       }
@@ -241,7 +242,7 @@ export default function EventPreviewModal({
             }
           }
         }
-      } catch (err) {
+      } catch {
         // Ignore sessionStorage errors
       }
     };
@@ -296,7 +297,7 @@ export default function EventPreviewModal({
             gap={0.5}
             width="100%"
           >
-            {(window as any).DEBUG && (
+            {window.DEBUG && (
               <IconButton
                 size="small"
                 onClick={async () => {
@@ -373,8 +374,6 @@ export default function EventPreviewModal({
                 </MenuItem>
               )}
               <EventDuplication
-                event={event}
-                onClose={() => setToggleActionMenu(null)}
                 onOpenDuplicate={() => {
                   setToggleActionMenu(null);
                   setHidePreview(true);
@@ -723,10 +722,11 @@ export default function EventPreviewModal({
       <EditModeDialog
         type={openEditModePopup}
         setOpen={setOpenEditModePopup}
-        event={event}
         eventAction={(type: "solo" | "all" | undefined) => {
           setTypeOfAction(type);
-          afterChoiceFunc && afterChoiceFunc(type);
+          if (afterChoiceFunc) {
+            afterChoiceFunc(type);
+          }
         }}
       />
       <EventUpdateModal
@@ -759,7 +759,7 @@ export default function EventPreviewModal({
                 return data.typeOfAction;
               }
             }
-          } catch (err) {
+          } catch {
             // Ignore
           }
           return undefined;
@@ -791,7 +791,7 @@ export default function EventPreviewModal({
 
 function makeRecurrenceString(
   event: CalendarEvent,
-  t: Function
+  t: (k: string, p?: string | object) => string
 ): string | undefined {
   if (!event.repetition) return;
 
@@ -851,7 +851,7 @@ function makeRecurrenceString(
 
 function formatDate(
   date: Date | string,
-  t: Function,
+  t: (k: string, p?: string | object) => string,
   timeZone: string,
   allday?: boolean
 ) {
@@ -880,7 +880,7 @@ function formatDate(
 function formatEnd(
   start: Date | string,
   end: Date | string,
-  t: Function,
+  t: (k: string, p?: string | object) => string,
   timeZone: string,
   allday?: boolean
 ) {
@@ -924,7 +924,10 @@ function formatEnd(
   }
 }
 
-export function makeAttendeePreview(attendees: userAttendee[], t: Function) {
+export function makeAttendeePreview(
+  attendees: userAttendee[],
+  t: (k: string, p?: string | object) => string
+) {
   const attendeePreview = [];
   const yesCount = attendees?.filter((a) => a.partstat === "ACCEPTED").length;
   const noCount = attendees?.filter((a) => a.partstat === "DECLINED").length;
diff --git a/src/features/Events/EventModal.tsx b/src/features/Events/EventModal.tsx
index 6098874..48def8a 100644
--- a/src/features/Events/EventModal.tsx
+++ b/src/features/Events/EventModal.tsx
@@ -1,6 +1,5 @@
 import { useAppDispatch, useAppSelector } from "@/app/hooks";
-import { getTimezoneOffset, resolveTimezone } from "@/utils/timezone";
-import { updateTempCalendar } from "@/components/Calendar/utils/calendarUtils";
+import { RootState } from "@/app/store";
 import { ResponsiveDialog } from "@/components/Dialog";
 import EventFormFields from "@/components/Event/EventFormFields";
 import { addDays } from "@/components/Event/utils/dateRules";
@@ -9,7 +8,6 @@ import {
   formatLocalDateTime,
 } from "@/components/Event/utils/dateTimeFormatters";
 import { convertFormDateTimeToISO } from "@/components/Event/utils/dateTimeHelpers";
-import { getCalendarRange } from "@/utils/dateUtils";
 import {
   buildEventFormTempData,
   clearEventFormTempData,
@@ -19,7 +17,11 @@ import {
   saveEventFormDataToTemp,
   showErrorNotification,
 } from "@/utils/eventFormTempStorage";
-import { browserDefaultTimeZone } from "@/utils/timezone";
+import {
+  browserDefaultTimeZone,
+  getTimezoneOffset,
+  resolveTimezone,
+} from "@/utils/timezone";
 import { TIMEZONES } from "@/utils/timezone-data";
 import { addVideoConferenceToDescription } from "@/utils/videoConferenceUtils";
 import { CalendarApi, DateSelectArg } from "@fullcalendar/core";
@@ -37,6 +39,7 @@ import React, {
 import { useI18n } from "twake-i18n";
 import { Calendar } from "../Calendars/CalendarTypes";
 import { putEventAsync } from "../Calendars/services";
+import { AsyncThunkResult } from "../Calendars/types/AsyncThunkResult";
 import { userAttendee } from "../User/models/attendee";
 import { CalendarEvent, RepetitionObject } from "./EventsTypes";
 
@@ -52,7 +55,7 @@ function EventPopover({
   open: boolean;
   onClose: (refresh?: boolean) => void;
   selectedRange: DateSelectArg | null;
-  setSelectedRange: Function;
+  setSelectedRange: React.Dispatch<React.SetStateAction<DateSelectArg | null>>;
   calendarRef: React.RefObject<CalendarApi | null>;
   event?: CalendarEvent;
 }) {
@@ -64,8 +67,8 @@ function EventPopover({
     useAppSelector((state) => state.user.userData?.openpaasId) ?? "";
   const calList = useAppSelector((state) => state.calendars.list);
   const selectPersonalCalendars = createSelector(
-    (state: any) => state.calendars,
-    (calendars: any) =>
+    (state: RootState) => state.calendars,
+    (calendars: RootState["calendars"]) =>
       Object.keys(calendars.list || {})
         .map((id) => {
           if (id.split("/")[0] === userId) {
@@ -704,7 +707,6 @@ function EventPopover({
         }, 0);
       }
     }
-    // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [open, event?.uid]);
 
   const handleSave = async () => {
@@ -818,20 +820,20 @@ function EventPopover({
       );
 
       // Handle result of putEventAsync - check if rejected first
+      const typedResult = result as AsyncThunkResult;
+
       // Check if result is a rejected action
-      if (result.type && result.type.endsWith("/rejected")) {
+      if (typedResult.type && typedResult.type.endsWith("/rejected")) {
         throw new Error(
-          result.error?.message || result.payload?.message || "API call failed"
+          typedResult.error?.message ||
+            typedResult.payload?.message ||
+            "API call failed"
         );
       }
 
       // If result has unwrap, call it (it will throw if rejected)
-      if (result && typeof result.unwrap === "function") {
-        try {
-          await result.unwrap();
-        } catch (unwrapError: any) {
-          throw unwrapError;
-        }
+      if (typedResult && typeof typedResult.unwrap === "function") {
+        await typedResult.unwrap();
       }
 
       // Clear temp data on successful save
@@ -839,7 +841,9 @@ function EventPopover({
 
       // Reset all state to default values only on successful save
       resetAllStateToDefault();
-    } catch (error: any) {
+    } catch (error) {
+      const errorObj = error as { message?: string };
+
       // API failed - restore form data and mark as error
       const errorFormData = {
         ...formDataToSave,
@@ -849,7 +853,7 @@ function EventPopover({
 
       // Show error notification
       showErrorNotification(
-        error?.message || "Failed to create event. Please try again."
+        errorObj.message || "Failed to create event. Please try again."
       );
 
       // Try to reopen modal by dispatching custom event
diff --git a/src/features/Events/EventUpdateModal.tsx b/src/features/Events/EventUpdateModal.tsx
index c89344c..60ed972 100644
--- a/src/features/Events/EventUpdateModal.tsx
+++ b/src/features/Events/EventUpdateModal.tsx
@@ -11,6 +11,7 @@ import {
   updateEventInstanceAsync,
   updateSeriesAsync,
 } from "@/features/Calendars/services";
+import { assertThunkSuccess } from "@/utils/assertThunkSuccess";
 import {
   buildEventFormTempData,
   clearEventFormTempData,
@@ -24,8 +25,8 @@ import {
 import { extractEventBaseUuid } from "@/utils/extractEventBaseUuid";
 import {
   browserDefaultTimeZone,
-  resolveTimezone,
   getTimezoneOffset,
+  resolveTimezone,
 } from "@/utils/timezone";
 import { TIMEZONES } from "@/utils/timezone-data";
 import { addVideoConferenceToDescription } from "@/utils/videoConferenceUtils";
@@ -39,6 +40,7 @@ import {
   updateEventLocal,
 } from "../Calendars/CalendarSlice";
 import { Calendar } from "../Calendars/CalendarTypes";
+import { AsyncThunkResult } from "../Calendars/types/AsyncThunkResult";
 import { userAttendee } from "../User/models/attendee";
 import { deleteEvent, getEvent, putEvent } from "./EventApi";
 import { CalendarEvent, RepetitionObject } from "./EventsTypes";
@@ -56,7 +58,7 @@ function EventUpdateModal({
   eventId: string;
   calId: string;
   open: boolean;
-  onClose: (event: {}, reason: "backdropClick" | "escapeKeyDown") => void;
+  onClose: (event: unknown, reason: "backdropClick" | "escapeKeyDown") => void;
   onCloseAll?: () => void;
   eventData?: CalendarEvent | null;
   typeOfAction?: "solo" | "all";
@@ -192,7 +194,7 @@ function EventUpdateModal({
         };
         const fetchedMasterEvent = await getEvent(masterEventToFetch, true);
         setMasterEvent(fetchedMasterEvent);
-      } catch (err: any) {
+      } catch (err) {
         console.error("Failed to fetch master event:", err);
         // Fallback to using the clicked instance
         setMasterEvent(event);
@@ -335,6 +337,7 @@ function EventUpdateModal({
         }
       }
     }
+    // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [
     open,
     event,
@@ -675,16 +678,22 @@ function EventUpdateModal({
         const deletePromises = Array.from(uniqueURLs).map(async (url) => {
           try {
             await deleteEvent(url);
-          } catch (deleteError: any) {
+          } catch (deleteError) {
+            // Check if error is an object with response or message properties
+            const errorObj = deleteError as {
+              response?: { status?: number };
+              message?: string;
+            };
+
             // Silently ignore 404 - file might already be deleted
             const is404 =
-              deleteError.response?.status === 404 ||
-              deleteError.message?.includes("404") ||
-              deleteError.message?.includes("Not Found");
+              errorObj.response?.status === 404 ||
+              errorObj.message?.includes("404") ||
+              errorObj.message?.includes("Not Found");
 
             if (!is404) {
               console.error(
-                `Failed to delete event file: ${deleteError.message}`
+                `Failed to delete event file: ${errorObj.message || "Unknown error"}`
               );
             }
           }
@@ -724,7 +733,10 @@ function EventUpdateModal({
         // Reset all state to default values only on successful save
         resetAllStateToDefault();
         initializedKeyRef.current = null;
-      } catch (err: any) {
+      } catch (err) {
+        // Check if error is an object with a message property
+        const errorObj = err as { message?: string };
+
         // API failed - restore form data and mark as error
         const errorFormData = {
           ...formDataToSave,
@@ -734,7 +746,8 @@ function EventUpdateModal({
 
         // Show error notification
         showErrorNotification(
-          err?.message || "Failed to convert recurring event. Please try again."
+          errorObj.message ||
+            "Failed to convert recurring event. Please try again."
         );
 
         if (createdSingleEventUid) {
@@ -769,7 +782,6 @@ function EventUpdateModal({
       if (recurrenceId) {
         if (typeOfAction === "solo") {
           // Update single instance with optimistic update + rollback
-          const oldEvent = { ...event };
 
           dispatch(
             updateEventLocal({
@@ -778,43 +790,30 @@ function EventUpdateModal({
             })
           );
 
-          try {
-            const result = await dispatch(
-              updateEventInstanceAsync({
-                cal: targetCalendar,
-                event: { ...newEvent, recurrenceId },
-              })
-            );
+          const result = await dispatch(
+            updateEventInstanceAsync({
+              cal: targetCalendar,
+              event: { ...newEvent, recurrenceId },
+            })
+          );
 
-            // Handle result of updateEventInstanceAsync
-            if (result && typeof (result as any).unwrap === "function") {
-              try {
-                await (result as any).unwrap();
-              } catch (unwrapError: any) {
-                throw unwrapError;
-              }
-            } else {
-              // Check if result is rejected
-              if (
-                result.type &&
-                (result.type as string).endsWith("/rejected")
-              ) {
-                const rejectedResult = result as any;
-                throw new Error(
-                  rejectedResult.error?.message ||
-                    rejectedResult.payload?.message ||
-                    "API call failed"
-                );
-              }
+          // Handle result of updateEventInstanceAsync
+          const typedResult = result as AsyncThunkResult;
+          if (typedResult && typeof typedResult.unwrap === "function") {
+            await typedResult.unwrap();
+          } else {
+            // Check if result is rejected
+            if (typedResult.type && typedResult.type.endsWith("/rejected")) {
+              throw new Error(
+                typedResult.error?.message ||
+                  typedResult.payload?.message ||
+                  "API call failed"
+              );
             }
-
-            // Clear temp data on successful save
-            clearEventFormTempData("update");
-          } catch (error: any) {
-            // Rollback optimistic update
-            dispatch(updateEventLocal({ calId, event: oldEvent }));
-            throw error; // Re-throw to be caught by outer catch
           }
+
+          // Clear temp data on successful save
+          clearEventFormTempData("update");
         } else if (typeOfAction === "all") {
           // Update all instances - check if repetition rules changed
           const baseUID = extractEventBaseUuid(event.uid);
@@ -872,22 +871,18 @@ function EventUpdateModal({
               );
 
               // Handle result of updateSeriesAsync
-              if (result && typeof (result as any).unwrap === "function") {
-                try {
-                  await (result as any).unwrap();
-                } catch (unwrapError: any) {
-                  throw unwrapError;
-                }
+              const typedResult = result as AsyncThunkResult;
+              if (typedResult && typeof typedResult.unwrap === "function") {
+                await typedResult.unwrap();
               } else {
                 // Check if result is rejected
                 if (
-                  result.type &&
-                  (result.type as string).endsWith("/rejected")
+                  typedResult.type &&
+                  typedResult.type.endsWith("/rejected")
                 ) {
-                  const rejectedResult = result as any;
                   throw new Error(
-                    rejectedResult.error?.message ||
-                      rejectedResult.payload?.message ||
+                    typedResult.error?.message ||
+                      typedResult.payload?.message ||
                       "API call failed"
                   );
                 }
@@ -949,26 +944,7 @@ function EventUpdateModal({
             );
 
             // Handle result of updateSeriesAsync
-            if (result && typeof (result as any).unwrap === "function") {
-              try {
-                await (result as any).unwrap();
-              } catch (unwrapError: any) {
-                throw unwrapError;
-              }
-            } else {
-              // Check if result is rejected
-              if (
-                result.type &&
-                (result.type as string).endsWith("/rejected")
-              ) {
-                const rejectedResult = result as any;
-                throw new Error(
-                  rejectedResult.error?.message ||
-                    rejectedResult.payload?.message ||
-                    "API call failed"
-                );
-              }
-            }
+            assertThunkSuccess(result);
 
             // Clear cache to ensure navigation shows updated data
             dispatch(clearFetchCache(calId));
@@ -990,20 +966,7 @@ function EventUpdateModal({
           );
 
           // Handle result of putEventAsync - check if rejected first
-          if (result.type && result.type.endsWith("/rejected")) {
-            throw new Error(
-              result.error?.message ||
-                result.payload?.message ||
-                "API call failed"
-            );
-          }
-          if (result && typeof result.unwrap === "function") {
-            try {
-              await result.unwrap();
-            } catch (unwrapError: any) {
-              throw unwrapError;
-            }
-          }
+          assertThunkSuccess(result);
 
           // Remove old single event AFTER new recurring instances are added to store
           // This prevents empty grid during the transition
@@ -1024,19 +987,16 @@ function EventUpdateModal({
             );
 
             // Handle result of putEventAsync - check if rejected first
-            if (result.type && result.type.endsWith("/rejected")) {
+            const typedResult = result as AsyncThunkResult;
+            if (typedResult.type && typedResult.type.endsWith("/rejected")) {
               throw new Error(
-                result.error?.message ||
-                  result.payload?.message ||
+                typedResult.error?.message ||
+                  typedResult.payload?.message ||
                   "API call failed"
               );
             }
-            if (result && typeof result.unwrap === "function") {
-              try {
-                await result.unwrap();
-              } catch (unwrapError: any) {
-                throw unwrapError;
-              }
+            if (typedResult && typeof typedResult.unwrap === "function") {
+              await typedResult.unwrap();
             }
 
             // Clear temp data on successful save
@@ -1060,8 +1020,9 @@ function EventUpdateModal({
         );
 
         // Handle result of putEventAsync
-        if (putResult && typeof putResult.unwrap === "function") {
-          await putResult.unwrap();
+        const typedPutResult = putResult as AsyncThunkResult;
+        if (typedPutResult && typeof typedPutResult.unwrap === "function") {
+          await typedPutResult.unwrap();
         }
 
         // Then move it to the new calendar
@@ -1074,8 +1035,9 @@ function EventUpdateModal({
         );
 
         // Handle result of moveEventAsync
-        if (moveResult && typeof moveResult.unwrap === "function") {
-          await moveResult.unwrap();
+        const typedMoveResult = moveResult as AsyncThunkResult;
+        if (typedMoveResult && typeof typedMoveResult.unwrap === "function") {
+          await typedMoveResult.unwrap();
         }
 
         // Clear temp data on successful move
@@ -1086,7 +1048,10 @@ function EventUpdateModal({
       clearEventFormTempData("update");
       resetAllStateToDefault();
       initializedKeyRef.current = null;
-    } catch (error: any) {
+    } catch (error) {
+      // Check if error is an object with a message property
+      const errorObj = error as { message?: string };
+
       // Handle errors for all branches
       // Rollback optimistic updates if any
       // API failed - restore form data and mark as error
@@ -1098,7 +1063,7 @@ function EventUpdateModal({
 
       // Show error notification
       showErrorNotification(
-        error?.message || "Failed to update event. Please try again."
+        errorObj.message || "Failed to update event. Please try again."
       );
 
       // Try to reopen modal
diff --git a/src/features/Events/EventsTypes.ts b/src/features/Events/EventsTypes.ts
index de0e449..3e1ad60 100644
--- a/src/features/Events/EventsTypes.ts
+++ b/src/features/Events/EventsTypes.ts
@@ -31,10 +31,10 @@ export interface CalendarEvent {
 
 export interface RepetitionObject {
   freq: string;
-  interval?: number;
+  interval?: number | null;
   byday?: string[] | null;
-  occurrences?: number;
-  endDate?: string;
+  occurrences?: number | null;
+  endDate?: string | null;
 }
 
 export interface AlarmObject {
diff --git a/src/features/Events/eventUtils.ts b/src/features/Events/eventUtils.ts
index f4ed7c8..6dfecf8 100644
--- a/src/features/Events/eventUtils.ts
+++ b/src/features/Events/eventUtils.ts
@@ -1,17 +1,19 @@
 import { convertFormDateTimeToISO } from "@/components/Event/utils/dateTimeHelpers";
 import { extractEventBaseUuid } from "@/utils/extractEventBaseUuid";
-import { resolveTimezoneId, convertEventDateTimeToISO } from "@/utils/timezone";
+import { convertEventDateTimeToISO, resolveTimezoneId } from "@/utils/timezone";
 import { TIMEZONES } from "@/utils/timezone-data";
 import ICAL from "ical.js";
 import moment from "moment-timezone";
+import {
+  RepetitionRule,
+  VObjectProperty,
+} from "../Calendars/types/CalendarData";
 import { userAttendee } from "../User/models/attendee";
 import { createAttendee } from "../User/models/attendee.mapper";
 import { AlarmObject, CalendarEvent, RepetitionObject } from "./EventsTypes";
-type RawEntry = [string, Record<string, string>, string, any];
 
 function inferTimezoneFromValue(
-  params: Record<string, string> | undefined,
-  value: string
+  params: Record<string, string> | undefined
 ): string | undefined {
   if (!params) {
     return undefined;
@@ -30,11 +32,11 @@ function inferTimezoneFromValue(
 }
 
 export function parseCalendarEvent(
-  data: RawEntry[],
+  data: VObjectProperty[],
   color: Record<string, string>,
   calendarid: string,
   eventURL: string,
-  valarm?: RawEntry[]
+  valarm?: VObjectProperty[]
 ): CalendarEvent {
   const event: Partial<CalendarEvent> = { color, attendee: [] };
   let recurrenceId;
@@ -44,18 +46,20 @@ export function parseCalendarEvent(
   for (const [key, params, , value] of data) {
     switch (key.toLowerCase()) {
       case "uid":
-        event.uid = value;
+        event.uid = String(value);
         break;
       case "transp":
-        event.transp = value;
+        event.transp = String(value);
         break;
       case "dtstart": {
-        event.start = value;
-        const detectedTz = inferTimezoneFromValue(params, value);
+        event.start = String(value);
+        const detectedTz = inferTimezoneFromValue(
+          params as Record<string, string>
+        );
         if (detectedTz) {
           event.timezone = detectedTz;
         }
-        if (dateRegex.test(value)) {
+        if (dateRegex.test(String(value))) {
           event.allday = true;
         } else {
           event.allday = false;
@@ -63,14 +67,16 @@ export function parseCalendarEvent(
         break;
       }
       case "dtend": {
-        event.end = value;
+        event.end = String(value);
         if (!event.timezone) {
-          const detectedTz = inferTimezoneFromValue(params, value);
+          const detectedTz = inferTimezoneFromValue(
+            params as Record<string, string>
+          );
           if (detectedTz) {
             event.timezone = detectedTz;
           }
         }
-        if (dateRegex.test(value)) {
+        if (dateRegex.test(String(value))) {
           event.allday = true;
         } else {
           event.allday = false;
@@ -78,50 +84,54 @@ export function parseCalendarEvent(
         break;
       }
       case "class":
-        event.class = value;
+        event.class = String(value);
         break;
       case "x-openpaas-videoconference":
-        event.x_openpass_videoconference = value;
+        event.x_openpass_videoconference = String(value);
         break;
       case "summary":
-        event.title = value;
+        event.title = String(value);
         break;
       case "description":
-        event.description = value;
+        event.description = String(value);
         break;
       case "location":
-        event.location = value;
+        event.location = String(value);
         break;
-      case "organizer":
+      case "organizer": {
+        const paramsObj = params as Record<string, string>;
         event.organizer = {
-          cn: params?.cn ?? "",
-          cal_address: value?.replace(/^mailto:/i, ""),
+          cn: paramsObj?.cn ?? "",
+          cal_address: String(value).replace(/^mailto:/i, ""),
         };
         break;
-      case "attendee":
+      }
+      case "attendee": {
+        const paramsObj = params as Record<string, string>;
         (event.attendee as userAttendee[]).push(
           createAttendee({
-            cn: params?.cn,
-            cal_address: value.replace(/^mailto:/i, ""),
-            partstat: params?.partstat as userAttendee["partstat"],
-            rsvp: params?.rsvp as userAttendee["rsvp"],
-            role: params?.role as userAttendee["role"],
-            cutype: params?.cutype as userAttendee["cutype"],
+            cn: paramsObj?.cn,
+            cal_address: String(value).replace(/^mailto:/i, ""),
+            partstat: paramsObj?.partstat as userAttendee["partstat"],
+            rsvp: paramsObj?.rsvp as userAttendee["rsvp"],
+            role: paramsObj?.role as userAttendee["role"],
+            cutype: paramsObj?.cutype as userAttendee["cutype"],
           })
         );
         break;
+      }
       case "dtstamp":
-        event.stamp = value;
+        event.stamp = String(value);
         break;
       case "sequence":
         event.sequence = Number(value);
         break;
       case "recurrence-id":
-        recurrenceId = value;
+        recurrenceId = String(value);
         break;
       case "exdate":
         if (!event.exdates) event.exdates = [];
-        event.exdates.push(value);
+        event.exdates.push(String(value));
         break;
       case "status":
         event.status = String(value);
@@ -129,25 +139,27 @@ export function parseCalendarEvent(
       case "duration":
         duration = String(value);
         break;
-      case "rrule":
-        event.repetition = { freq: value.freq.toLowerCase() };
-        if (value.byday) {
-          if (typeof value.byday === "string") {
-            event.repetition.byday = [value.byday];
+      case "rrule": {
+        const ruleValue = value as RepetitionRule;
+        event.repetition = { freq: ruleValue.freq.toLowerCase() };
+        if (ruleValue.byday) {
+          if (typeof ruleValue.byday === "string") {
+            event.repetition.byday = [ruleValue.byday];
           } else {
-            event.repetition.byday = value.byday;
+            event.repetition.byday = ruleValue.byday;
           }
         }
-        if (value.until) {
-          event.repetition.endDate = value.until;
+        if (ruleValue.until) {
+          event.repetition.endDate = ruleValue.until;
         }
-        if (value.count) {
-          event.repetition.occurrences = value.count;
+        if (ruleValue.count) {
+          event.repetition.occurrences = ruleValue.count;
         }
-        if (value.interval) {
-          event.repetition.interval = value.interval;
+        if (ruleValue.interval) {
+          event.repetition.interval = ruleValue.interval;
         }
         break;
+      }
     }
   }
   if (recurrenceId && event.uid) {
@@ -160,10 +172,10 @@ export function parseCalendarEvent(
     for (const [key, , , value] of valarm[1]) {
       switch (key.toLowerCase()) {
         case "action":
-          event.alarm.action = value;
+          event.alarm.action = String(value);
           break;
         case "trigger":
-          event.alarm.trigger = value;
+          event.alarm.trigger = String(value);
           break;
       }
     }
@@ -209,10 +221,10 @@ export function parseCalendarEvent(
 export function calendarEventToJCal(
   event: CalendarEvent,
   calOwnerEmail?: string
-): any[] {
+) {
   const tzid = event.timezone; // Fallback to UTC if no timezone provided
 
-  const vevent: any[] = makeVevent(event, tzid, calOwnerEmail);
+  const vevent = makeVevent(event, tzid, calOwnerEmail);
 
   const timezoneData = TIMEZONES.zones[event.timezone];
   const vtimezone = makeTimezone(timezoneData, event);
@@ -242,7 +254,7 @@ export function makeVevent(
   calOwnerEmail: string | undefined,
   isMasterEvent?: boolean
 ) {
-  const vevent: any[] = [
+  const vevent: [string, unknown[]] = [
     "vevent",
     [
       ["uid", {}, "text", extractEventBaseUuid(event.uid)],
@@ -279,18 +291,13 @@ export function makeVevent(
     ];
     vevent.push([["valarm", valarm]]);
   }
-  vevent.push([]);
 
   if (event.end) {
-    const startDate = new Date(event.start);
-    const endDate = new Date(event.end);
-    let finalEndDate = endDate;
-
     vevent[1].push([
       "dtend",
       { tzid },
       event.allday ? "date" : "date-time",
-      formatDateToICal(finalEndDate, event.allday ?? false, tzid),
+      formatDateToICal(new Date(event.end), event.allday ?? false, tzid),
     ]);
   }
   if (event.organizer) {
@@ -311,21 +318,21 @@ export function makeVevent(
     vevent[1].push(["description", {}, "text", event.description]);
   }
   if (event.repetition?.freq) {
-    const repetitionRule: Record<string, any> = { freq: event.repetition.freq };
+    const repetitionRule: RepetitionRule = { freq: event.repetition.freq };
     if (event.repetition.interval) {
-      repetitionRule["interval"] = event.repetition.interval;
+      repetitionRule.interval = event.repetition.interval;
     }
     if (event.repetition.occurrences) {
-      repetitionRule["count"] = event.repetition.occurrences;
+      repetitionRule.count = event.repetition.occurrences;
     }
     if (event.repetition.endDate) {
-      repetitionRule["until"] = event.repetition.endDate;
+      repetitionRule.until = event.repetition.endDate;
     }
     if (
       event.repetition.byday !== null &&
       event.repetition.byday !== undefined
     ) {
-      repetitionRule["byday"] = event.repetition.byday;
+      repetitionRule.byday = event.repetition.byday;
     }
     vevent[1].push(["rrule", {}, "recur", repetitionRule]);
   }
@@ -362,7 +369,7 @@ export function makeVevent(
   return vevent;
 }
 
-function formatDateToICal(date: Date, allday: Boolean, timezone?: string) {
+function formatDateToICal(date: Date, allday: boolean, timezone?: string) {
   const pad = (n: number) => n.toString().padStart(2, "0");
 
   if (allday) {
diff --git a/src/features/Events/formHelpers.ts b/src/features/Events/formHelpers.ts
index a9a640e..cf3634f 100644
--- a/src/features/Events/formHelpers.ts
+++ b/src/features/Events/formHelpers.ts
@@ -6,6 +6,7 @@ import { TIMEZONES } from "@/utils/timezone-data";
 import { addVideoConferenceToDescription } from "@/utils/videoConferenceUtils";
 import { userAttendee } from "../User/models/attendee";
 import { CalendarEvent, RepetitionObject } from "./EventsTypes";
+import { Calendar } from "../Calendars/CalendarTypes";
 
 export interface TimezoneListResult {
   zones: string[];
@@ -58,7 +59,7 @@ export interface PopulateFormFromEventParams {
   setHasVideoConference: (value: boolean) => void;
   setMeetingLink: (value: string | null) => void;
   setCalendarid?: (value: string) => void;
-  calendarsList?: Record<string, any>;
+  calendarsList?: Record<string, Calendar>;
   calId?: string;
 }
 
diff --git a/src/features/Search/SearchResultsPage.tsx b/src/features/Search/SearchResultsPage.tsx
index 634ca8d..318911a 100644
--- a/src/features/Search/SearchResultsPage.tsx
+++ b/src/features/Search/SearchResultsPage.tsx
@@ -21,6 +21,7 @@ import EventPreviewModal from "../Events/EventDisplayPreview";
 import { CalendarEvent } from "../Events/EventsTypes";
 import { setView } from "../Settings/SettingsSlice";
 import "./searchResult.styl";
+import { SearchEventResult } from "./types/SearchEventResult";
 
 const styles = {
   M3BodyLarge: {
@@ -110,7 +111,7 @@ export default function SearchResultsPage() {
     layout = (
       <Box className="search-result-content-body">
         <Stack sx={{ mt: 2 }}>
-          {results?.map((r: any, idx: number) => (
+          {results.map((r: SearchEventResult, idx: number) => (
             <ResultItem
               key={`row-${idx}-event-${r.data.uid}`}
               eventData={r}
@@ -144,7 +145,7 @@ function ResultItem({
   eventData,
   dispatch,
 }: {
-  eventData: Record<string, any>;
+  eventData: SearchEventResult;
   dispatch: AppDispatch;
 }) {
   const { t } = useI18n();
@@ -163,7 +164,7 @@ function ResultItem({
 
   const [openPreview, setOpenPreview] = useState(false);
 
-  const handleOpenResult = async (eventData: Record<string, any>) => {
+  const handleOpenResult = async (eventData: SearchEventResult) => {
     if (calendar) {
       const event = {
         URL: eventData._links.self.href,
diff --git a/src/features/Search/SearchSlice.ts b/src/features/Search/SearchSlice.ts
index 3bd6d8d..22e1da7 100644
--- a/src/features/Search/SearchSlice.ts
+++ b/src/features/Search/SearchSlice.ts
@@ -4,7 +4,7 @@ import { searchEvent } from "../Events/EventApi";
 
 export interface SearchResultsState {
   hits: number;
-  results: Record<string, any>[];
+  results: Record<string, unknown>[];
   error: string | null;
   loading: boolean;
 }
@@ -17,24 +17,30 @@ const initialState: SearchResultsState = {
 };
 
 export const searchEventsAsync = createAsyncThunk<
-  { hits: number; events: Record<string, any>[] },
-  { search: string; filters: any },
+  { hits: number; events: Record<string, unknown>[] },
+  {
+    search: string;
+    filters: {
+      searchIn: string[];
+      keywords: string;
+      organizers: string[];
+      attendees: string[];
+    };
+  },
   { rejectValue: { message: string; status?: number } }
 >("events/searchEvents", async ({ search, filters }, { rejectWithValue }) => {
   try {
-    const response = (await searchEvent(search, filters)) as Record<
-      string,
-      any
-    >;
+    const response = await searchEvent(search, filters);
 
     return {
       hits: Number(response._total_hits),
       events: response._embedded?.events ?? [],
     };
-  } catch (err: any) {
+  } catch (err) {
+    const error = err as { response?: { status?: number } };
     return rejectWithValue({
       message: formatReduxError(err),
-      status: err.response?.status,
+      status: error.response?.status,
     });
   }
 });
diff --git a/src/features/Search/types/SearchEventData.ts b/src/features/Search/types/SearchEventData.ts
new file mode 100644
index 0000000..36f4c11
--- /dev/null
+++ b/src/features/Search/types/SearchEventData.ts
@@ -0,0 +1,20 @@
+export type SearchEventData = {
+  uid: string;
+  userId: string;
+  calendarId: string;
+  start: string;
+  end?: string;
+  allDay?: boolean;
+  summary?: string;
+  description?: string;
+  location?: string;
+  class?: string;
+  dtstamp?: string;
+  isRecurrentMaster?: boolean;
+  attendees?: unknown[];
+  organizer?: {
+    cn?: string;
+    email?: string;
+  };
+  ["x-openpaas-videoconference"]?: string;
+};
diff --git a/src/features/Search/types/SearchEventResult.ts b/src/features/Search/types/SearchEventResult.ts
new file mode 100644
index 0000000..8cb32d6
--- /dev/null
+++ b/src/features/Search/types/SearchEventResult.ts
@@ -0,0 +1,10 @@
+import { SearchEventData } from "./SearchEventData";
+
+export type SearchEventResult = {
+  data: SearchEventData;
+  _links: {
+    self: {
+      href: string;
+    };
+  };
+};
diff --git a/src/features/Search/types/SearchEventsResponse.ts b/src/features/Search/types/SearchEventsResponse.ts
new file mode 100644
index 0000000..abdef01
--- /dev/null
+++ b/src/features/Search/types/SearchEventsResponse.ts
@@ -0,0 +1,6 @@
+export type SearchEventsResponse = {
+  _total_hits?: number | string;
+  _embedded?: {
+    events?: Record<string, unknown>[];
+  };
+};
diff --git a/src/features/Settings/SettingsPage.tsx b/src/features/Settings/SettingsPage.tsx
index d144452..a5dc527 100644
--- a/src/features/Settings/SettingsPage.tsx
+++ b/src/features/Settings/SettingsPage.tsx
@@ -1,8 +1,7 @@
 import { useAppDispatch, useAppSelector } from "@/app/hooks";
 import { useTimeZoneList } from "@/components/Calendar/TimezoneSelector";
-import { getTimezoneOffset } from "@/utils/timezone";
 import { TimezoneAutocomplete } from "@/components/Timezone/TimezoneAutocomplete";
-import { browserDefaultTimeZone } from "@/utils/timezone";
+import { browserDefaultTimeZone, getTimezoneOffset } from "@/utils/timezone";
 import {
   Box,
   FormControl,
@@ -14,6 +13,7 @@ import {
   ListItemText,
   MenuItem,
   Select,
+  SelectChangeEvent,
   Snackbar,
   Switch,
   Tab,
@@ -105,7 +105,7 @@ export default function SettingsPage() {
     setActiveSettingsSubTab(newValue);
   };
 
-  const handleLanguageChange = (event: any) => {
+  const handleLanguageChange = (event: SelectChangeEvent<string>) => {
     const newLanguage = event.target.value;
     const previousLanguage = currentLanguage;
 
diff --git a/src/features/Settings/SettingsSlice.ts b/src/features/Settings/SettingsSlice.ts
index c956c38..6341ea9 100644
--- a/src/features/Settings/SettingsSlice.ts
+++ b/src/features/Settings/SettingsSlice.ts
@@ -1,5 +1,6 @@
 import { browserDefaultTimeZone } from "@/utils/timezone";
 import { createSlice, PayloadAction } from "@reduxjs/toolkit";
+import { ConfigurationItem, ModuleConfiguration } from "../User/userDataTypes";
 import { getOpenPaasUserDataAsync } from "../User/userSlice";
 
 export interface SettingsState {
@@ -12,7 +13,7 @@ export interface SettingsState {
 }
 
 const savedLang = localStorage.getItem("lang");
-const defaultLang = savedLang ?? (window as any).LANG ?? "en";
+const defaultLang = savedLang ?? window.LANG ?? "en";
 
 const savedTimeZone = localStorage.getItem("timeZone");
 // If savedTimeZone is the string "null" or doesn't exist, use null
@@ -59,12 +60,15 @@ export const settingsSlice = createSlice({
   extraReducers: (builder) => {
     builder.addCase(getOpenPaasUserDataAsync.fulfilled, (state, action) => {
       const coreModule = action.payload.configurations?.modules?.find(
-        (module: any) => module.name === "core"
+        (module: ModuleConfiguration) => module.name === "core"
       );
       const datetimeConfig = coreModule?.configurations?.find(
-        (config: any) => config.name === "datetime"
+        (config: ConfigurationItem) => config.name === "datetime"
       );
-      const timeZone = datetimeConfig?.value?.timeZone;
+      const datetimeValue = datetimeConfig?.value as
+        | { timeZone?: string }
+        | undefined;
+      const timeZone = datetimeValue?.timeZone;
 
       if (timeZone) {
         state.timeZone = timeZone;
@@ -76,25 +80,25 @@ export const settingsSlice = createSlice({
         localStorage.setItem("timeZone", browserDefaultTimeZone);
       }
       const esnCalendarModule = action.payload.configurations?.modules?.find(
-        (module: any) => module.name === "linagora.esn.calendar"
+        (module: ModuleConfiguration) => module.name === "linagora.esn.calendar"
       );
       const hideDeclinedEventsConfig = esnCalendarModule?.configurations?.find(
-        (config: any) => config.name === "hideDeclinedEvents"
+        (config: ConfigurationItem) => config.name === "hideDeclinedEvents"
       );
       state.hideDeclinedEvents =
         typeof hideDeclinedEventsConfig?.value === "boolean"
           ? hideDeclinedEventsConfig.value
           : null;
 
-      const calendarModule = action.payload.configurations.modules.find(
-        (module: any) => module.name === "calendar"
+      const calendarModule = action.payload.configurations?.modules?.find(
+        (module: ModuleConfiguration) => module.name === "calendar"
       );
       if (calendarModule?.configurations) {
-        const alarmEmailsConfig = calendarModule.configurations.find(
-          (config: any) => config.name === "displayWeekNumbers"
+        const displayWeekNumbersConfig = calendarModule.configurations.find(
+          (config: ConfigurationItem) => config.name === "displayWeekNumbers"
         );
-        if (alarmEmailsConfig) {
-          state.displayWeekNumbers = alarmEmailsConfig.value === true;
+        if (displayWeekNumbersConfig) {
+          state.displayWeekNumbers = displayWeekNumbersConfig.value === true;
         }
       }
     });
diff --git a/src/features/User/HandleLogin.tsx b/src/features/User/HandleLogin.tsx
index 41308ec..e24160e 100644
--- a/src/features/User/HandleLogin.tsx
+++ b/src/features/User/HandleLogin.tsx
@@ -52,6 +52,7 @@ export function HandleLogin() {
     };
 
     initiateLogin();
+    // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [userData.userData, calendars.list, dispatch]);
 
   // Navigate to /calendar only when all data is ready
diff --git a/src/features/User/oidcAuth.ts b/src/features/User/oidcAuth.ts
index eb204bf..3b1af84 100644
--- a/src/features/User/oidcAuth.ts
+++ b/src/features/User/oidcAuth.ts
@@ -1,14 +1,14 @@
-import * as client from "openid-client";
 import { getLocation } from "@/utils/apiUtils";
+import * as client from "openid-client";
 
 export const clientConfig = {
-  url: (window as any).SSO_BASE_URL ?? "",
-  client_id: (window as any).SSO_CLIENT_ID ?? "",
-  scope: (window as any).SSO_SCOPE ?? "",
-  redirect_uri: (window as any).SSO_REDIRECT_URI ?? "",
-  response_type: (window as any).SSO_RESPONSE_TYPE ?? "",
-  code_challenge_method: (window as any).SSO_CODE_CHALLENGE_METHOD ?? "",
-  post_logout_redirect_uri: (window as any).SSO_POST_LOGOUT_REDIRECT ?? "",
+  url: window.SSO_BASE_URL ?? "",
+  client_id: window.SSO_CLIENT_ID ?? "",
+  scope: window.SSO_SCOPE ?? "",
+  redirect_uri: window.SSO_REDIRECT_URI ?? "",
+  response_type: window.SSO_RESPONSE_TYPE ?? "",
+  code_challenge_method: window.SSO_CODE_CHALLENGE_METHOD ?? "",
+  post_logout_redirect_uri: window.SSO_POST_LOGOUT_REDIRECT ?? "",
 };
 
 export async function getClientConfig() {
@@ -19,18 +19,21 @@ export async function getClientConfig() {
 }
 
 export async function Auth() {
-  let code_verifier = client.randomPKCECodeVerifier();
-  let code_challenge = await client.calculatePKCECodeChallenge(code_verifier);
+  const code_verifier = client.randomPKCECodeVerifier();
+  const code_challenge = await client.calculatePKCECodeChallenge(code_verifier);
   const openIdClientConfig = await getClientConfig();
-  let state = client.randomState();
-  let parameters: Record<string, string> = {
+  const state = client.randomState();
+  const parameters: Record<string, string> = {
     redirect_uri: clientConfig.redirect_uri,
     scope: clientConfig.scope!,
     code_challenge,
     code_challenge_method: clientConfig.code_challenge_method,
     state,
   };
-  let redirectTo = client.buildAuthorizationUrl(openIdClientConfig, parameters);
+  const redirectTo = client.buildAuthorizationUrl(
+    openIdClientConfig,
+    parameters
+  );
 
   return { redirectTo, code_verifier, state };
 }
@@ -44,13 +47,15 @@ export async function Logout() {
   return endSessionUrl;
 }
 
-export async function Callback(code_verifier: string, state: any) {
+export async function Callback(
+  code_verifier: string,
+  state: string | undefined
+) {
   try {
     const openIdClientConfig = await getClientConfig();
     const currentLocation = getLocation();
 
-    console.log("Callback URL:", currentLocation);
-    console.log("Code verifier:", code_verifier);
+    console.info("Callback URL:", currentLocation);
 
     const tokenSet = await client.authorizationCodeGrant(
       openIdClientConfig,
diff --git a/src/features/User/type/OpenPaasUserData.ts b/src/features/User/type/OpenPaasUserData.ts
new file mode 100644
index 0000000..b0ac704
--- /dev/null
+++ b/src/features/User/type/OpenPaasUserData.ts
@@ -0,0 +1,11 @@
+import { ModuleConfiguration } from "../userDataTypes";
+
+export interface OpenPaasUserData {
+  firstname?: string;
+  lastname?: string;
+  id?: string;
+  preferredEmail?: string;
+  configurations?: {
+    modules?: ModuleConfiguration[];
+  };
+}
diff --git a/src/features/User/userAPI.ts b/src/features/User/userAPI.ts
index 19b19d7..7716564 100644
--- a/src/features/User/userAPI.ts
+++ b/src/features/User/userAPI.ts
@@ -1,5 +1,11 @@
 import { User } from "@/components/Attendees/PeopleSearch";
 import { api } from "@/utils/apiUtils";
+import { OpenPaasUserData } from "./type/OpenPaasUserData";
+import {
+  ConfigurationItem,
+  ModuleConfiguration,
+  SearchResponseItem,
+} from "./userDataTypes";
 
 export async function getOpenPaasUser() {
   const user = await api.get(`api/user`);
@@ -10,7 +16,7 @@ export async function searchUsers(
   query: string,
   objectTypes: string[] = ["user", "contact"]
 ): Promise<User[]> {
-  const response: any[] = await api
+  const response: SearchResponseItem[] = await api
     .post(`api/people/search`, {
       body: JSON.stringify({
         limit: 10,
@@ -29,9 +35,9 @@ export async function searchUsers(
   }));
 }
 
-export async function getUserDetails(id: string) {
+export async function getUserDetails(id: string): Promise<OpenPaasUserData> {
   const user = await api.get(`api/users/${id}`).json();
-  return user;
+  return user as OpenPaasUserData;
 }
 
 export interface UserConfigurationUpdates {
@@ -39,7 +45,7 @@ export interface UserConfigurationUpdates {
   notifications?: Record<string, unknown>;
   timezone?: string | null;
   displayWeekNumbers?: boolean;
-  previousConfig?: Record<string, any>;
+  previousConfig?: Record<string, unknown>;
   alarmEmails?: boolean;
   hideDeclinedEvents?: boolean;
 }
@@ -47,9 +53,9 @@ export interface UserConfigurationUpdates {
 export async function updateUserConfigurations(
   updates: UserConfigurationUpdates
 ): Promise<Response | { status: number }> {
-  const coreConfigs: Array<{ name: string; value: any }> = [];
-  const calendarConfigs: Array<{ name: string; value: any }> = [];
-  const esnCalendarConfigs: Array<{ name: string; value: any }> = [];
+  const coreConfigs: ConfigurationItem[] = [];
+  const calendarConfigs: ConfigurationItem[] = [];
+  const esnCalendarConfigs: ConfigurationItem[] = [];
 
   if (updates.language !== undefined) {
     coreConfigs.push({ name: "language", value: updates.language });
@@ -58,10 +64,13 @@ export async function updateUserConfigurations(
     coreConfigs.push({ name: "notifications", value: updates.notifications });
   }
   if (updates.timezone !== undefined) {
+    const previousDatetime = updates.previousConfig?.datetime as
+      | { timeZone?: string }
+      | undefined;
     coreConfigs.push({
       name: "datetime",
       value: {
-        ...updates.previousConfig?.datetime,
+        ...previousDatetime,
         timeZone: updates.timezone,
       },
     });
@@ -85,10 +94,7 @@ export async function updateUserConfigurations(
     });
   }
 
-  const modules: Array<{
-    name: string;
-    configurations: Array<{ name: string; value: any }>;
-  }> = [];
+  const modules: ModuleConfiguration[] = [];
 
   if (coreConfigs.length > 0) {
     modules.push({
diff --git a/src/features/User/userDataTypes.ts b/src/features/User/userDataTypes.ts
index 44d7f14..555663b 100644
--- a/src/features/User/userDataTypes.ts
+++ b/src/features/User/userDataTypes.ts
@@ -11,13 +11,7 @@ export interface userData {
 }
 
 export interface UserConfigurations {
-  modules?: Array<{
-    name: string;
-    configurations?: Array<{
-      name: string;
-      value: any;
-    }>;
-  }>;
+  modules?: ModuleConfiguration[];
 }
 
 export interface NotificationSettings {
@@ -33,3 +27,22 @@ export interface userOrganiser {
   cn: string;
   cal_address: string;
 }
+// Type for search response from the API
+export interface SearchResponseItem {
+  id?: string;
+  emailAddresses?: Array<{ value?: string }>;
+  names?: Array<{ displayName?: string }>;
+  photos?: Array<{ url?: string }>;
+}
+
+// Type for configuration item
+export interface ConfigurationItem {
+  name: string;
+  value: unknown;
+}
+
+// Type for module configuration
+export interface ModuleConfiguration {
+  name: string;
+  configurations: ConfigurationItem[];
+}
diff --git a/src/features/User/userSlice.ts b/src/features/User/userSlice.ts
index 6d72ca2..5c959d7 100644
--- a/src/features/User/userSlice.ts
+++ b/src/features/User/userSlice.ts
@@ -1,24 +1,44 @@
 import { formatReduxError } from "@/utils/errorUtils";
 import { createAsyncThunk, createSlice } from "@reduxjs/toolkit";
+import { OpenPaasUserData } from "./type/OpenPaasUserData";
 import {
   getOpenPaasUser,
   updateUserConfigurations,
   UserConfigurationUpdates,
 } from "./userAPI";
-import { userData, userOrganiser } from "./userDataTypes";
+import {
+  ConfigurationItem,
+  ModuleConfiguration,
+  userData,
+  userOrganiser,
+} from "./userDataTypes";
+
+// Type for core config datetime
+interface DatetimeConfig {
+  timeZone: string | null;
+  [key: string]: unknown;
+}
+
+// Type for core config
+interface CoreConfig {
+  language: string | null;
+  datetime: DatetimeConfig;
+  [key: string]: unknown;
+}
 
 export const getOpenPaasUserDataAsync = createAsyncThunk<
-  Record<string, any>,
+  OpenPaasUserData,
   void,
   { rejectValue: { message: string; status?: number } }
 >("user/getOpenPaasUserData", async (_, { rejectWithValue }) => {
   try {
-    const user = (await getOpenPaasUser()) as Record<string, any>;
-    return user;
-  } catch (err: any) {
+    const user = await getOpenPaasUser();
+    return user as OpenPaasUserData;
+  } catch (err) {
+    const error = err as { response?: { status?: number } };
     return rejectWithValue({
       message: formatReduxError(err),
-      status: err.response?.status,
+      status: error.response?.status,
     });
   }
 });
@@ -31,10 +51,11 @@ export const updateUserConfigurationsAsync = createAsyncThunk<
   try {
     await updateUserConfigurations(updates);
     return updates;
-  } catch (err: any) {
+  } catch (err) {
+    const error = err as { response?: { status?: number } };
     return rejectWithValue({
       message: formatReduxError(err),
-      status: err.response?.status,
+      status: error.response?.status,
     });
   }
 });
@@ -46,11 +67,11 @@ export const userSlice = createSlice({
     organiserData: null as unknown as userOrganiser,
     tokens: null as unknown as Record<string, string>,
     coreConfig: {
-      language: null as string | null,
+      language: null,
       datetime: {
-        timeZone: null as string | null,
+        timeZone: null,
       },
-    } as Record<string, any>,
+    } as CoreConfig,
     alarmEmailsEnabled: null as boolean | null,
     loading: true,
     error: null as unknown as string | null,
@@ -76,7 +97,7 @@ export const userSlice = createSlice({
     },
     setTimezone: (state, action) => {
       if (!state.coreConfig.datetime) {
-        state.coreConfig.datetime = {};
+        state.coreConfig.datetime = { timeZone: null };
       }
       state.coreConfig.datetime.timeZone = action.payload;
       if (state.userData) {
@@ -110,40 +131,44 @@ export const userSlice = createSlice({
           state.organiserData.cal_address = action.payload.preferredEmail;
           state.userData.email = action.payload.preferredEmail;
         }
-
         // Extract data from configurations.modules
         if (action.payload.configurations?.modules) {
           const coreModule = action.payload.configurations.modules.find(
-            (module: any) => module.name === "core"
+            (module: ModuleConfiguration) => module.name === "core"
           );
           if (coreModule?.configurations) {
             const newCoreConfig = Object.fromEntries(
-              coreModule.configurations.map(
-                (e: { name: string; value: any }) => [e.name, e.value]
-              )
+              coreModule.configurations.map((e: ConfigurationItem) => [
+                e.name,
+                e.value,
+              ])
             );
-
             state.coreConfig = {
               ...state.coreConfig,
               ...newCoreConfig,
-            };
+            } as CoreConfig;
             const languageConfig = coreModule.configurations.find(
-              (config: any) => config.name === "language"
+              (config: ConfigurationItem) => config.name === "language"
             );
             if (languageConfig?.value) {
-              state.coreConfig.language = languageConfig.value;
+              state.coreConfig.language = languageConfig.value as string;
               if (state.userData)
-                state.userData.language = languageConfig.value;
+                state.userData.language = languageConfig.value as string;
             }
-
             const datetimeConfig = coreModule.configurations.find(
-              (config: any) => config.name === "datetime"
+              (config: ConfigurationItem) => config.name === "datetime"
             );
             if (datetimeConfig?.value) {
-              const serverTimeZone = datetimeConfig.value.timeZone;
+              const datetimeValue = datetimeConfig.value as {
+                timeZone?: string;
+              };
+              const serverTimeZone = datetimeValue.timeZone;
               state.coreConfig.datetime = {
                 ...state.coreConfig.datetime,
-                ...datetimeConfig.value,
+                ...(typeof datetimeConfig.value === "object" &&
+                datetimeConfig.value !== null
+                  ? datetimeConfig.value
+                  : {}),
                 timeZone: serverTimeZone !== undefined ? serverTimeZone : null,
               };
               if (state.userData) {
@@ -160,14 +185,13 @@ export const userSlice = createSlice({
               }
             }
           }
-
           // Extract alarmEmails from configurations.modules
           const calendarModule = action.payload.configurations.modules.find(
-            (module: any) => module.name === "calendar"
+            (module: ModuleConfiguration) => module.name === "calendar"
           );
           if (calendarModule?.configurations) {
             const alarmEmailsConfig = calendarModule.configurations.find(
-              (config: any) => config.name === "alarmEmails"
+              (config: ConfigurationItem) => config.name === "alarmEmails"
             );
             if (alarmEmailsConfig) {
               state.alarmEmailsEnabled = alarmEmailsConfig.value === true;
@@ -194,7 +218,7 @@ export const userSlice = createSlice({
         }
         if (action.payload.timezone !== undefined) {
           if (!state.coreConfig.datetime) {
-            state.coreConfig.datetime = {};
+            state.coreConfig.datetime = { timeZone: null };
           }
           state.coreConfig.datetime.timeZone = action.payload.timezone;
           if (state.userData) {
diff --git a/src/setupTests.ts b/src/setupTests.ts
index ecfb6f8..61de887 100644
--- a/src/setupTests.ts
+++ b/src/setupTests.ts
@@ -1,3 +1,4 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
 import "@testing-library/jest-dom";
 
 import { TextEncoder } from "util";
@@ -49,7 +50,7 @@ class ResizeObserverMock {
   disconnect() {}
 }
 
-(global as any).ResizeObserver = ResizeObserverMock;
+global.ResizeObserver = ResizeObserverMock;
 
 class IntersectionObserverMock {
   observe() {}
@@ -59,8 +60,8 @@ class IntersectionObserverMock {
 
 (global as any).IntersectionObserver = IntersectionObserverMock;
 if (typeof window !== "undefined") {
-  (window as any).WS_PING_PERIOD_MS = 5000;
-  (window as any).WS_PING_TIMEOUT_PERIOD_MS = 5000;
+  window.WS_PING_PERIOD_MS = 5000;
+  window.WS_PING_TIMEOUT_PERIOD_MS = 5000;
 }
 // Suppress jsdom CSS selector parsing errors for Emotion/MUI
 if (typeof window !== "undefined" && window.getComputedStyle) {
diff --git a/src/utils/__test__/videoConferenceUtils.test.ts b/src/utils/__test__/videoConferenceUtils.test.ts
index 12e1ff8..84a9d9e 100644
--- a/src/utils/__test__/videoConferenceUtils.test.ts
+++ b/src/utils/__test__/videoConferenceUtils.test.ts
@@ -11,7 +11,7 @@ const mockWindow = {
   VIDEO_CONFERENCE_BASE_URL: "https://meet.linagora.com",
 };
 
-// @ts-ignore
+// @ts-expect-error :  Mock window object for Node.js environment
 global.window = mockWindow;
 
 describe("videoConferenceUtils", () => {
diff --git a/src/utils/apiUtils.ts b/src/utils/apiUtils.ts
index aef517c..1f8497b 100644
--- a/src/utils/apiUtils.ts
+++ b/src/utils/apiUtils.ts
@@ -8,7 +8,7 @@ const RETRY_CONFIG = {
   maxDelay: 120000,
 };
 export const api = ky.extend({
-  prefixUrl: (window as any).CALENDAR_BASE_URL,
+  prefixUrl: window.CALENDAR_BASE_URL,
   retry: {
     limit: RETRY_CONFIG.maxRetries,
     backoffLimit: RETRY_CONFIG.maxDelay,
@@ -90,7 +90,7 @@ export function isValidUrl(string?: string) {
 
   try {
     url = new URL(string ?? "");
-  } catch (_) {
+  } catch {
     return false;
   }
   return url;
diff --git a/src/utils/assertThunkSuccess.tsx b/src/utils/assertThunkSuccess.tsx
new file mode 100644
index 0000000..1525738
--- /dev/null
+++ b/src/utils/assertThunkSuccess.tsx
@@ -0,0 +1,13 @@
+import { AsyncThunkResult } from "@/features/Calendars/types/AsyncThunkResult";
+
+export async function assertThunkSuccess(result: unknown): Promise<void> {
+  const typed = result as AsyncThunkResult;
+  if (typed?.type?.endsWith("/rejected")) {
+    throw new Error(
+      typed.error?.message || typed.payload?.message || "API call failed"
+    );
+  }
+  if (typeof typed.unwrap === "function") {
+    await typed.unwrap();
+  }
+}
diff --git a/src/utils/errorUtils.ts b/src/utils/errorUtils.ts
index d24fbcd..cfefa3b 100644
--- a/src/utils/errorUtils.ts
+++ b/src/utils/errorUtils.ts
@@ -1,9 +1,26 @@
+import { RejectedError } from "@/features/Calendars/types/RejectedError";
+
 export function formatReduxError(error: unknown): string {
   if (!error) return "Unknown error";
+
   if (typeof error === "string") return error;
-  if (typeof error === "object") {
-    const err = error as any;
-    if (err?.message) return err.message;
+
+  if (typeof error === "object" && error !== null) {
+    if (
+      "message" in error &&
+      typeof (error as { message: unknown }).message === "string"
+    ) {
+      return (error as { message: string }).message;
+    }
   }
+
   return "Unexpected error occurred";
 }
+
+export function toRejectedError(err: unknown): RejectedError {
+  const status =
+    typeof err === "object" && err !== null && "response" in err
+      ? (err as { response?: { status?: number } }).response?.status
+      : undefined;
+  return { message: formatReduxError(err), status };
+}
diff --git a/src/utils/timezone.ts b/src/utils/timezone.ts
index 231534c..36a521b 100644
--- a/src/utils/timezone.ts
+++ b/src/utils/timezone.ts
@@ -22,14 +22,14 @@ export function registerTimezones() {
   }
 }
 
-function buildTimezone(tzid: string, ics: string): any {
+function buildTimezone(tzid: string, ics: string): ICAL.Timezone {
   return (
     ICAL.TimezoneService.get(tzid) ||
     new ICAL.Timezone(new ICAL.Component(ICAL.parse(ics)))
   );
 }
 
-function findTimezone(tzid: string): any {
+function findTimezone(tzid: string): ICAL.Timezone {
   if (TIMEZONES.zones[tzid]) {
     return buildTimezone(tzid, TIMEZONES.zones[tzid].ics);
   }
diff --git a/src/utils/videoConferenceUtils.ts b/src/utils/videoConferenceUtils.ts
index e2b6325..b61c779 100644
--- a/src/utils/videoConferenceUtils.ts
+++ b/src/utils/videoConferenceUtils.ts
@@ -25,9 +25,7 @@ export function generateMeetingId(): string {
  */
 export function generateMeetingLink(baseUrl?: string): string {
   const base =
-    baseUrl ||
-    (window as any).VIDEO_CONFERENCE_BASE_URL ||
-    "https://meet.linagora.com";
+    baseUrl || window.VIDEO_CONFERENCE_BASE_URL || "https://meet.linagora.com";
   const meetingId = generateMeetingId();
   return `${base}/${meetingId}`;
 }
diff --git a/src/websocket/WebSocketGate.tsx b/src/websocket/WebSocketGate.tsx
index 6202d3a..024c5a8 100644
--- a/src/websocket/WebSocketGate.tsx
+++ b/src/websocket/WebSocketGate.tsx
@@ -1,5 +1,6 @@
 import { useAppDispatch, useAppSelector } from "@/app/hooks";
 import { AppDispatch } from "@/app/store";
+import { Calendar } from "@/features/Calendars/CalendarTypes";
 import { useSelectedCalendars } from "@/utils/storage/useSelectedCalendars";
 import { useCallback, useEffect, useMemo, useRef, useState } from "react";
 import { useI18n } from "twake-i18n";
@@ -51,7 +52,9 @@ export function WebSocketGate() {
     useAppSelector((state) => state?.calendars?.templist) ?? {}
   );
 
-  const calendarsToRefreshRef = useRef<Map<string, any>>(new Map());
+  const calendarsToRefreshRef = useRef<
+    Map<string, { calendar: Calendar; type?: "temp" }>
+  >(new Map());
   const calendarsToHideRef = useRef<Set<string>>(new Set());
   const debouncedUpdateFnRef = useRef<
     ((dispatch: AppDispatch) => void) | undefined
@@ -102,6 +105,7 @@ export function WebSocketGate() {
         clearReconnectTimeout();
       }
     },
+    // eslint-disable-next-line react-hooks/exhaustive-deps
     [scheduleReconnect, clearReconnectTimeout]
   );
 
@@ -111,6 +115,7 @@ export function WebSocketGate() {
       (error as ErrorEvent)?.message ?? error.type ?? "unknown";
     setWebSocketStatus(t("websocket.error", { error: errorMessage }));
     setWebSocketStatusSerity("error");
+    // eslint-disable-next-line react-hooks/exhaustive-deps
   }, []);
 
   const callBacks = useMemo(
@@ -145,6 +150,7 @@ export function WebSocketGate() {
 
       clearReconnectTimeout();
     }
+    // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [isSocketOpen, clearReconnectTimeout]);
 
   // Manage WebSocket connection
@@ -206,6 +212,7 @@ export function WebSocketGate() {
       abortController.abort();
       cleanup();
     };
+    // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [
     isAuthenticated,
     callBacks,
@@ -220,7 +227,7 @@ export function WebSocketGate() {
 
     // If we just reconnected, force a re-sync
     if (justReconnectedRef.current && isSocketOpen) {
-      console.log("Re-syncing calendars after reconnection");
+      console.info("Re-syncing calendars after reconnection");
       previousCalendarListRef.current = [];
       previousTempCalendarListRef.current = [];
       justReconnectedRef.current = false;
@@ -277,6 +284,7 @@ export function WebSocketGate() {
       window.removeEventListener("online", handleOnline);
       window.removeEventListener("offline", handleOffline);
     };
+    // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [isSocketOpen, isAuthenticated, clearReconnectTimeout]);
 
   useEffect(() => {
@@ -315,6 +323,7 @@ export function WebSocketGate() {
         pingCleanupRef.current = null;
       }
     };
+    // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [isSocketOpen]);
 
   return websocketStatus ? (
diff --git a/src/websocket/connection/createConnection.ts b/src/websocket/connection/createConnection.ts
index 18b92de..21adade 100644
--- a/src/websocket/connection/createConnection.ts
+++ b/src/websocket/connection/createConnection.ts
@@ -6,8 +6,8 @@ export async function createWebSocketConnection(
   callbacks: WebSocketCallbacks
 ): Promise<WebSocketWithCleanup> {
   const wsBaseUrl =
-    (window as any).WEBSOCKET_URL ??
-    (window as any).CALENDAR_BASE_URL?.replace(
+    window.WEBSOCKET_URL ??
+    window.CALENDAR_BASE_URL?.replace(
       /^http(s)?:/,
       (_: string, s: string | undefined) => (s ? "wss:" : "ws:")
     ) ??
@@ -37,7 +37,7 @@ export async function createWebSocketConnection(
     }, CONNECTION_TIMEOUT_MS);
 
     const openHandler = () => {
-      console.log("WebSocket connection opened");
+      console.info("WebSocket connection opened");
       clearTimeout(timeoutId);
       socket.removeEventListener(
         WS_INBOUND_EVENTS.CONNECTION_OPENED,
@@ -73,7 +73,7 @@ export async function createWebSocketConnection(
   };
 
   const closeHandler = (event: CloseEvent) => {
-    console.log("WebSocket closed:", event.code, event.reason);
+    console.info("WebSocket closed:", event.code, event.reason);
     cleanup();
     callbacks.onClose?.(event);
   };
diff --git a/src/websocket/connection/lifecycle/pingWebSocket.ts b/src/websocket/connection/lifecycle/pingWebSocket.ts
index 78b39a7..c848ce5 100644
--- a/src/websocket/connection/lifecycle/pingWebSocket.ts
+++ b/src/websocket/connection/lifecycle/pingWebSocket.ts
@@ -19,8 +19,8 @@ export interface PingCleanup {
   sendPing: () => void;
 }
 
-const DEFAULT_PING_INTERVAL = (window as any).WS_PING_PERIOD_MS ?? 30000;
-const DEFAULT_PONG_TIMEOUT = (window as any).WS_PING_TIMEOUT_PERIOD_MS ?? 35000;
+const DEFAULT_PING_INTERVAL = window.WS_PING_PERIOD_MS ?? 30000;
+const DEFAULT_PONG_TIMEOUT = window.WS_PING_TIMEOUT_PERIOD_MS ?? 35000;
 
 /**
  * Sets up a ping/pong mechanism to monitor WebSocket connection health
diff --git a/src/websocket/connection/lifecycle/useWebSocketReconnect.ts b/src/websocket/connection/lifecycle/useWebSocketReconnect.ts
index 95aa4cd..f0e8db6 100644
--- a/src/websocket/connection/lifecycle/useWebSocketReconnect.ts
+++ b/src/websocket/connection/lifecycle/useWebSocketReconnect.ts
@@ -18,6 +18,7 @@ export function useWebSocketReconnect(
       clearTimeout(reconnectTimeoutRef.current);
       reconnectTimeoutRef.current = null;
     }
+    // eslint-disable-next-line react-hooks/exhaustive-deps
   }, []);
 
   const scheduleReconnect = useCallback(() => {
@@ -35,7 +36,7 @@ export function useWebSocketReconnect(
     const delay = getRetryDelay(reconnectAttemptsRef.current, RECONNECT_CONFIG);
     reconnectAttemptsRef.current += 1;
 
-    console.log(
+    console.info(
       `Scheduling WebSocket reconnection in ${Math.round(delay)}ms ` +
         `(attempt ${reconnectAttemptsRef.current}/${MAX_RECONNECT_ATTEMPTS})`
     );
@@ -45,12 +46,13 @@ export function useWebSocketReconnect(
         reconnectTimeoutRef.current = null;
         return;
       }
-      console.log(
+      console.info(
         `Attempting WebSocket reconnection (attempt ${reconnectAttemptsRef.current}/${MAX_RECONNECT_ATTEMPTS})`
       );
       setShouldConnect((prev) => !prev);
       clearReconnectTimeout();
     }, delay);
+    // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [clearReconnectTimeout]);
   return { scheduleReconnect, clearReconnectTimeout };
 }
diff --git a/src/websocket/messaging/type/UpdateCalendarsAccumulators.ts b/src/websocket/messaging/type/UpdateCalendarsAccumulators.ts
index d6734d8..575f1c9 100644
--- a/src/websocket/messaging/type/UpdateCalendarsAccumulators.ts
+++ b/src/websocket/messaging/type/UpdateCalendarsAccumulators.ts
@@ -1,7 +1,8 @@
 import { AppDispatch } from "@/app/store";
+import { Calendar } from "@/features/Calendars/CalendarTypes";
 
 export interface UpdateCalendarsAccumulators {
-  calendarsToRefresh: Map<string, any>;
+  calendarsToRefresh: Map<string, { calendar: Calendar; type?: "temp" }>;
   calendarsToHide: Set<string>;
   debouncedUpdateFn?: (dispatch: AppDispatch) => void;
   currentDebouncePeriod?: number;
diff --git a/src/websocket/messaging/updateCalendars.ts b/src/websocket/messaging/updateCalendars.ts
index 7927633..68912df 100644
--- a/src/websocket/messaging/updateCalendars.ts
+++ b/src/websocket/messaging/updateCalendars.ts
@@ -1,5 +1,6 @@
 import type { AppDispatch } from "@/app/store";
 import { store } from "@/app/store";
+import { Calendar } from "@/features/Calendars/CalendarTypes";
 import { refreshCalendarWithSyncToken } from "@/features/Calendars/services";
 import { findCalendarById, getDisplayedCalendarRange } from "@/utils";
 import { setSelectedCalendars } from "@/utils/storage/setSelectedCalendars";
@@ -12,7 +13,10 @@ const DEFAULT_DEBOUNCE_MS = 0;
 
 function createDebouncedUpdate(
   debouncePeriodMs: number,
-  getCalendarsToRefresh: () => Map<string, any>,
+  getCalendarsToRefresh: () => Map<
+    string,
+    { calendar: Calendar; type?: "temp" }
+  >,
   getCalendarsToHide: () => Set<string>
 ) {
   return debounce(
@@ -55,8 +59,7 @@ export function updateCalendars(
   );
   accumulateCalendarsToHide(calendarsToHide, accumulators.calendarsToHide);
 
-  const debouncePeriod =
-    (window as any).WS_DEBOUNCE_PERIOD_MS ?? DEFAULT_DEBOUNCE_MS;
+  const debouncePeriod = window.WS_DEBOUNCE_PERIOD_MS ?? DEFAULT_DEBOUNCE_MS;
 
   if (debouncePeriod > 0) {
     if (
@@ -94,7 +97,7 @@ export function updateCalendars(
 function accumulateCalendarsToRefresh(
   state: ReturnType<typeof store.getState>,
   calendarPaths: Set<string>,
-  calendarsToRefreshMap: Map<string, any>
+  calendarsToRefreshMap: Map<string, { calendar: Calendar; type?: "temp" }>
 ) {
   calendarPaths.forEach((calendarPath) => {
     const calendarId = parseCalendarPath(calendarPath);
@@ -126,7 +129,7 @@ function accumulateCalendarsToHide(
 function processCalendarsToRefresh(
   dispatch: AppDispatch,
   currentRange: { start: Date; end: Date },
-  calendarsMap: Map<string, any>
+  calendarsMap: Map<string, { calendar: Calendar; type?: "temp" }>
 ) {
   calendarsMap.forEach((calendar) => {
     dispatch(
diff --git a/src/websocket/operations/registerToCalendars.ts b/src/websocket/operations/registerToCalendars.ts
index ebdde12..740fd1b 100644
--- a/src/websocket/operations/registerToCalendars.ts
+++ b/src/websocket/operations/registerToCalendars.ts
@@ -12,5 +12,5 @@ export function registerToCalendars(
     })
   );
 
-  console.log("Registered to calendars", calendarURIList);
+  console.info("Registered to calendars", calendarURIList);
 }
diff --git a/src/websocket/operations/unregisterToCalendars.ts b/src/websocket/operations/unregisterToCalendars.ts
index 03a9be1..688eaa2 100644
--- a/src/websocket/operations/unregisterToCalendars.ts
+++ b/src/websocket/operations/unregisterToCalendars.ts
@@ -12,5 +12,5 @@ export function unregisterToCalendars(
     })
   );
 
-  console.log("Unregistered to calendars", calendarURIList);
+  console.info("Unregistered to calendars", calendarURIList);
 }
diff --git a/src/window.d.ts b/src/window.d.ts
new file mode 100644
index 0000000..5844bb2
--- /dev/null
+++ b/src/window.d.ts
@@ -0,0 +1,33 @@
+import type { AppIconProps } from "@/components/Menubar/Menubar";
+import type { MutableRefObject } from "react";
+import type { CalendarApi } from "@fullcalendar/core";
+
+export {};
+
+declare global {
+  interface Window {
+    SSO_BASE_URL: string;
+    SSO_CLIENT_ID: string;
+    SSO_SCOPE: string;
+    SSO_REDIRECT_URI: string;
+    SSO_RESPONSE_TYPE: "code";
+    SSO_CODE_CHALLENGE_METHOD: "S256";
+    SSO_POST_LOGOUT_REDIRECT: string;
+
+    CALENDAR_BASE_URL: string;
+    MAIL_SPA_URL: string;
+    VIDEO_CONFERENCE_BASE_URL: string;
+
+    DEBUG: boolean;
+    LANG: string;
+
+    WEBSOCKET_URL: string;
+    WS_DEBOUNCE_PERIOD_MS: number;
+    WS_PING_PERIOD_MS: number;
+    WS_PING_TIMEOUT_PERIOD_MS: number;
+
+    appList: AppIconProps[];
+
+    __calendarRef: MutableRefObject<CalendarApi | null>;
+  }
+}