diff --git a/.eslintrc.cjs b/.eslintrc.cjs
index 130810f2a65..4c39cb23edb 100644
--- a/.eslintrc.cjs
+++ b/.eslintrc.cjs
@@ -2,5 +2,9 @@ module.exports = {
 	root: true,
 	extends: [
 		'@nextcloud',
+		'@nextcloud/eslint-config/typescript',
 	],
+	rules: {
+		'@typescript-eslint/no-unused-vars': ['off'],
+	}
 }
diff --git a/package.json b/package.json
index dd0690bb83a..0ab61ed4383 100644
--- a/package.json
+++ b/package.json
@@ -20,8 +20,8 @@
     "build": "vite --mode production build",
     "dev": "vite --mode development build",
     "watch": "vite --mode development build --watch",
-    "lint": "eslint --ext .js,.vue src cypress",
-    "lint:fix": "eslint --ext .js,.vue src cypress --fix",
+    "lint": "tsc && eslint --ext .js,.vue src cypress",
+    "lint:fix": "tsc && eslint --ext .js,.vue src cypress --fix",
     "stylelint": "stylelint src/**/*.vue src/**/*.scss src/**/*.css css/*.scss",
     "stylelint:fix": "stylelint src/**/*.vue src/**/*.scss src/**/*.css css/*.scss --fix",
     "test": "NODE_ENV=test jest",
diff --git a/src/helpers/base64.js b/src/helpers/base64.ts
similarity index 90%
rename from src/helpers/base64.js
rename to src/helpers/base64.ts
index 3b3becae567..fd7acdf176a 100644
--- a/src/helpers/base64.js
+++ b/src/helpers/base64.ts
@@ -34,7 +34,7 @@ import { toBase64, fromBase64 } from 'lib0/buffer'
  *
  * @param {ArrayBuffer} data - binary data to encode
  */
-export function encodeArrayBuffer(data) {
+export function encodeArrayBuffer(data: ArrayBuffer): string {
 	const view = new Uint8Array(data)
 	return toBase64(view)
 }
@@ -43,6 +43,6 @@ export function encodeArrayBuffer(data) {
  *
  * @param {string} encoded - base64 encoded string to decode
  */
-export function decodeArrayBuffer(encoded) {
+export function decodeArrayBuffer(encoded: string): ArrayBuffer {
 	return fromBase64(encoded)
 }
diff --git a/src/helpers/yjs.js b/src/helpers/yjs.js
index a34331d2ebb..6c56c6122c0 100644
--- a/src/helpers/yjs.js
+++ b/src/helpers/yjs.js
@@ -20,7 +20,7 @@
  *
  */
 
-import { encodeArrayBuffer, decodeArrayBuffer } from '../helpers/base64.js'
+import { encodeArrayBuffer, decodeArrayBuffer } from '../helpers/base64.ts'
 import * as Y from 'yjs'
 import * as decoding from 'lib0/decoding.js'
 import * as encoding from 'lib0/encoding.js'
diff --git a/src/services/WebSocketPolyfill.js b/src/services/WebSocketPolyfill.js
index 9273027bf2e..4ee98ee6579 100644
--- a/src/services/WebSocketPolyfill.js
+++ b/src/services/WebSocketPolyfill.js
@@ -21,7 +21,7 @@
  */
 
 import { logger } from '../helpers/logger.js'
-import { encodeArrayBuffer, decodeArrayBuffer } from '../helpers/base64.js'
+import { encodeArrayBuffer, decodeArrayBuffer } from '../helpers/base64.ts'
 
 /**
  *