Add eslint and fix linter issues

.eslintrc.json

@@ -0,0 +1,3 @@
+{
+	"extends": ["@nextcloud/eslint-config/typescript"]
+}

.github/workflows/lint-eslint.yml

@@ -0,0 +1,62 @@
+# This workflow is provided via the organization template repository
+#
+# https://github.com/nextcloud/.github
+# https://docs.github.com/en/actions/learn-github-actions/sharing-workflows-with-your-organization
+#
+# Use lint-eslint together with lint-eslint-when-unrelated to make eslint a required check for GitHub actions
+# https://docs.github.com/en/repositories/configuring-branches-and-merges-in-your-repository/defining-the-mergeability-of-pull-requests/troubleshooting-required-status-checks#handling-skipped-but-required-checks
+
+name: Lint eslint
+
+on:
+  pull_request:
+    paths:
+      - '.github/workflows/**'
+      - 'src/**'
+      - 'appinfo/info.xml'
+      - 'package.json'
+      - 'package-lock.json'
+      - 'tsconfig.json'
+      - '.eslintrc.*'
+      - '.eslintignore'
+      - '**.js'
+      - '**.ts'
+      - '**.vue'
+
+permissions:
+  contents: read
+
+concurrency:
+  group: lint-eslint-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+
+    name: eslint
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9 # v3.5.3
+
+      - name: Read package.json node and npm engines version
+        uses: skjnldsv/read-package-engines-version-actions@8205673bab74a63eb9b8093402fd9e0e018663a1 # v2.2
+        id: versions
+        with:
+          fallbackNode: '^20'
+          fallbackNpm: '^9'
+
+      - name: Set up node ${{ steps.versions.outputs.nodeVersion }}
+        uses: actions/setup-node@64ed1c7eab4cce3362f8c340dee64e5eaeef8f7c # v3
+        with:
+          node-version: ${{ steps.versions.outputs.nodeVersion }}
+
+      - name: Set up npm ${{ steps.versions.outputs.npmVersion }}
+        run: npm i -g npm@"${{ steps.versions.outputs.npmVersion }}"
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Lint
+        run: npm run lint

jest.config.ts

@@ -0,0 +1,7 @@
+import type { Config } from 'jest'
+
+const config: Config = {
+	testEnvironment: 'jsdom',
+}
+
+export default config

lib/index.ts

@@ -7,13 +7,13 @@ import { onError as onNotLoggedInError } from './interceptors/not-logged-in'
 
 interface CancelableAxiosInstance extends AxiosInstance {
 	CancelToken: CancelTokenStatic
-	isCancel(value: any): boolean
+	isCancel: typeof Axios.isCancel
 }
 
-const client: any = Axios.create({
+const client = Axios.create({
 	headers: {
-		requesttoken: getRequestToken() ?? ''
-	}
+		requesttoken: getRequestToken() ?? '',
+	},
 })
 const cancelableClient: CancelableAxiosInstance = Object.assign(client, {
 	CancelToken: Axios.CancelToken,
@@ -24,6 +24,6 @@ cancelableClient.interceptors.response.use(r => r, onCsrfTokenError(cancelableCl
 cancelableClient.interceptors.response.use(r => r, onMaintenanceModeError(cancelableClient))
 cancelableClient.interceptors.response.use(r => r, onNotLoggedInError)
 
-onRequestTokenUpdate(token => client.defaults.headers.requesttoken = token)
+onRequestTokenUpdate(token => { client.defaults.headers.requesttoken = token })
 
 export default cancelableClient

lib/interceptors/maintenance-mode.ts

@@ -20,8 +20,8 @@ export const onError = axios => async (error) => {
 		&& (!config[RETRY_DELAY_KEY] || config[RETRY_DELAY_KEY] <= 32)) {
 		const retryDelay = (config[RETRY_DELAY_KEY] ?? 1) * 2
 		console.warn(`Request to ${responseURL} failed because of maintenance mode. Retrying in ${retryDelay}s`)
-		await new Promise((resolve, _) => {
-			setTimeout(resolve, retryDelay*1000)
+		await new Promise((resolve) => {
+			setTimeout(resolve, retryDelay * 1000)
 		})
 
 		return axios({