ci: add GitHub Actions workflow for automated testing

.github/workflows/test.yml

@@ -0,0 +1,35 @@
+name: Test
+
+on:
+  pull_request:
+    branches: [ main ]
+  push:
+    branches: [ main ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: [14.x, 16.x, 18.x]
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v3
+        with:
+          node-version: ${{ matrix.node-version }}
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run tests
+        run: npm test
+
+      - name: Upload coverage
+        uses: actions/upload-artifact@v3
+        with:
+          name: coverage-${{ matrix.node-version }}
+          path: coverage/

jest.config.js

@@ -0,0 +1,30 @@
+/** @type {import('ts-jest').JestConfigWithTsJest} */
+export default {
+  preset: 'ts-jest',
+  testEnvironment: 'node',
+  roots: ['<rootDir>/src'],
+  testMatch: ['**/__tests__/**/*.test.ts'],
+  moduleFileExtensions: ['ts', 'js', 'json', 'node'],
+  setupFilesAfterEnv: ['<rootDir>/src/__tests__/setup.ts'],
+  transform: {
+    '^.+\\.tsx?$': [
+      'ts-jest',
+      {
+        useESM: true,
+        isolatedModules: true
+      }
+    ]
+  },
+  moduleNameMapper: {
+    '^(\\.{1,2}/.*)\\.js$': '$1'
+  },
+  extensionsToTreatAsEsm: ['.ts'],
+  collectCoverage: true,
+  coverageDirectory: 'coverage',
+  coverageReporters: ['text', 'lcov'],
+  collectCoverageFrom: [
+    'src/**/*.ts',
+    '!src/**/*.test.ts',
+    '!src/__tests__/**'
+  ]
+};

package.json

@@ -6,6 +6,9 @@
   "scripts": {
     "build": "tsc && chmod +x dist/index.js",
     "start": "node dist/index.js",
+    "test": "jest --coverage",
+    "test:watch": "jest --watch",
+    "test:coverage": "jest --coverage",
     "test:list": "node --loader ts-node/esm src/index.ts list",
     "test:install": "node --loader ts-node/esm src/index.ts install",
     "test:installed": "node --loader ts-node/esm src/index.ts installed",
@@ -16,8 +19,6 @@
     "version:major": "npm version major",
     "publish:npm": "npm run build && npm publish --access public",
     "pr-check": "node src/scripts/pr-check.js",
-    "test:watch": "NODE_OPTIONS=--experimental-vm-modules jest --config jest.config.mjs --watch",
-    "test:coverage": "NODE_OPTIONS=--experimental-vm-modules jest --config jest.config.mjs --coverage",
     "prepare": "npm run build"
   },
   "bin": {

tsconfig.json

@@ -1,7 +1,7 @@
 {
   "compilerOptions": {
     "target": "ES2020",
-    "module": "ES2020",
+    "module": "commonjs",
     "moduleResolution": "node",
     "esModuleInterop": true,
     "strict": true,