Add smoke tests to CI

.github/workflows/ci.yml

@@ -86,6 +86,66 @@ jobs:
     - name: Build src
       run: npx hereby build-src
 
+  smoke:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+    - uses: actions/setup-node@v3
+      with:
+        node-version: "*"
+        check-latest: true
+    - run:  npm ci
+
+    - run: npx hereby lkg
+    - run: |
+        npm pack
+        mv typescript*.tgz typescript.tgz
+        echo "PACKAGE=$PWD/typescript.tgz" >> $GITHUB_ENV
+
+    - name: Smoke test
+      run: |
+        cd "$(mktemp -d)"
+        npm init --yes
+        npm install $PACKAGE tslib
+
+        npx tsc --version
+        echo '{"seq": 1, "command": "status"}' | npx tsserver
+
+        cat > smoke.js << EOF
+        const { __importDefault, __importStar } = require("tslib");
+        const ts = require(process.argv[2]);
+
+        // See: https://github.com/microsoft/TypeScript/pull/51474#issuecomment-1310871623
+        const fns = [
+          [() => ts.version,                          true],
+          [() => ts.default.version,                  false],
+          [() => __importDefault(ts).version,         false],
+          [() => __importDefault(ts).default.version, true],
+          [() => __importStar(ts).version,            true],
+          [() => __importStar(ts).default.version,    true],
+        ];
+
+        for (const [fn, shouldSucceed] of fns) {
+          let success = false;
+          try {
+            success = !!fn();
+          }
+          catch {}
+          if (success !== shouldSucceed) {
+            if (success) {
+              console.error(`${fn.toString()} unexpectedly succeeded.`);
+            }
+            else {
+              console.error(`${fn.toString()} did not succeed.`);
+            }
+            process.exitCode = 1;
+          }
+        }
+        EOF
+
+        node ./smoke.js typescript
+        node ./smoke.js typescript/lib/tsserverlibrary
 
   misc:
     runs-on: ubuntu-latest