Add Check JavaScript action.

.github/workflows/check-js.yml

@@ -0,0 +1,44 @@
+name: Check JavaScript
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+jobs:
+  lint_test:
+    name: Lint and test
+    runs-on: macos-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install Chrome
+        uses: browser-actions/setup-chrome@v1
+
+      # - name: Install Firefox
+      #   uses: browser-actions/setup-firefox@v1
+
+      - name: Install Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+
+      - name: Install npm
+        # Install the version of npm that is required to build the project.
+        run: npm install -g npm@10
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Lint
+        run: npm run lint
+
+      - name: Test
+        run: npm test
+
+      - name: Generate coverage report
+        run: npm run coverage
+