Test with Bun in CI

Bun is a newer JS runtime that aims to be faster yet Node-compatible.
It uses JSC as the underlying engine. Since it aims to be compatible
with Node, it's easy to reuse the existing testing infrastructure,
unlike with Deno, and since it uses JSC, there is a good reason to test
with Bun as well as Node.

.github/workflows/test.yml

@@ -41,6 +41,25 @@ jobs:
       run: npm run check
     - name: Test
       run: npm test
+  compiler-bun:
+    name: "Compiler with Bun"
+    runs-on: ubuntu-latest
+    needs: check
+    steps:
+    - uses: actions/checkout@v3
+    - name: Install Bun
+      uses: oven-sh/setup-bun@v1
+    - name: Install dependencies
+      run: bun install
+    - name: Build
+      run: bun run scripts/build
+    - name: Test
+      run: |
+        bun run ./tests/parser.js &&
+        bun run ./tests/compiler.js &&
+        bun run ./tests/browser.js &&
+        bun run ./tests/asconfig.js &&
+        bun run ./tests/transform.js
   bootstrap:
     name: "Bootstrap (${{ matrix.target }})"
     runs-on: ubuntu-latest