BridgeJS: Check generated TypeScript validity in test suites

.github/workflows/test.yml

@@ -69,6 +69,8 @@ jobs:
           git diff --exit-code Sources/JavaScriptKit/Runtime
       - run: swift test --package-path ./Plugins/PackageToJS
       - run: swift test --package-path ./Plugins/BridgeJS
+      - name: Validate BridgeJS TypeScript declarations
+        run: npm run check:bridgejs-dts
 
   test-bridgejs-against-swift-versions:
     name: Test BridgeJS against Swift versions
@@ -90,6 +92,8 @@ jobs:
           node-version: '20'
       - name: Install TypeScript
         run: npm install
+      - name: Validate BridgeJS TypeScript declarations
+        run: npm run check:bridgejs-dts
       - name: Run BridgeJS tests
         # NOTE: Seems like the prebuilt SwiftSyntax binaries are not compatible with
         # non-macro dependents, so disable experimental prebuilts for now.

Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/tsconfig.json

@@ -0,0 +1,12 @@
+{
+  "compilerOptions": {
+    "strict": true,
+    "noEmit": true,
+    "skipLibCheck": false,
+    "target": "ES2020",
+    "module": "ES2020",
+    "moduleResolution": "node",
+    "lib": ["ES2020", "DOM"]
+  },
+  "include": ["*.d.ts"]
+}

package.json

@@ -13,7 +13,8 @@
     "build:clean": "rm -rf Runtime/lib",
     "build:ts": "cd Runtime; rollup -c",
     "prepublishOnly": "npm run build",
-    "format": "prettier --write Runtime/src"
+    "format": "prettier --write Runtime/src",
+    "check:bridgejs-dts": "tsc --project Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/tsconfig.json"
   },
   "keywords": [
     "Swift",