Add linting workflow to CI

.eslintignore

@@ -4,3 +4,5 @@ client/out/**
 client/bundle.js
 server/node_modules/**
 server/out/**
+jest-style-mock.js
+jest.config.js

.github/workflows/lint.yml

@@ -0,0 +1,31 @@
+# SPDX-FileCopyrightText: The PFDL VS Code Extension Contributors
+# SPDX-License-Identifier: MIT
+
+name: Lint
+
+on:
+  pull_request:
+    branches:
+      - main
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: read
+
+jobs:
+  run-lint:
+    name: Lint check
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+      - name: Setup Node
+        uses: actions/setup-node@60edb5dd545a775178f52524783378180af0d1f8 # v4.0.2
+        with:
+          node-version: '18'
+      - name: Install npm packages
+        run: npm install
+      - name: Run ESLint check
+        run: npm run lint

package.json

@@ -104,7 +104,8 @@
     "postinstall": "cd client && npm install && cd ../server && npm install && cd ..",
     "test": "jest client/src/test/*.test.ts",
     "test:ci": "jest --config ./jest.config.js --collectCoverage --coverageDirectory=\"./coverage\" --ci --reporters=default --reporters=jest-junit --watchAll=false",
-    "browserify": "browserify ./client/out/code_visualization/main.js -g browserify-css -o ./client/bundle.js"
+    "browserify": "browserify ./client/out/code_visualization/main.js -g browserify-css -o ./client/bundle.js",
+    "lint": "eslint ./"
   },
   "devDependencies": {
     "@types/jest": "^29.5.5",