Add an integration test for worker thread TS compilation

Author: airhorns

integration-test/app-worker-thread/.swcrc

@@ -0,0 +1,15 @@
+{
+  "jsc": {
+    "parser": {
+      "syntax": "typescript",
+      "tsx": true,
+      "decorators": true,
+      "dynamicImport": true
+    },
+    "target": "esnext"
+  },
+  "module": {
+    "type": "commonjs",
+    "lazy": true
+  }
+}

integration-test/app-worker-thread/app-thread.ts

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+import { parentPort, threadId } from "worker_threads";
+
+function fibonacci(n: number): number {
+  if (n <= 1) return n;
+  return fibonacci(n - 1) + fibonacci(n - 2);
+}
+
+parentPort?.on("message", (message: number) => {
+  const result = fibonacci(message);
+  parentPort?.postMessage({
+    input: message,
+    result: result,
+    threadId: threadId,
+  });
+});

integration-test/app-worker-thread/package.json

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+{
+  "name": "app-worker-thread",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "type": "commonjs",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "license": "ISC"
+}

integration-test/app-worker-thread/run.ts

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+import path from "path";
+import { Worker } from "worker_threads";
+
+async function runWorkerThread(n: number): Promise<{ input: number; result: number; threadId: number }> {
+  return new Promise((resolve, reject) => {
+    const worker = new Worker(path.join(__dirname, "app-thread.js"));
+
+    worker.on("message", (result) => {
+      console.log(`Fibonacci(${result.input}) = ${result.result} (calculated in thread ${result.threadId})`);
+      resolve(result);
+    });
+
+    worker.on("error", reject);
+    worker.on("exit", (code) => {
+      if (code !== 0) {
+        reject(new Error(`Worker stopped with exit code ${code}`));
+      }
+    });
+
+    worker.postMessage(n);
+  });
+}
+
+async function main() {
+  console.log("Starting worker thread test...");
+  try {
+    const result = await runWorkerThread(10);
+    console.log("IT WORKED", result);
+  } catch (error) {
+    console.error("Worker thread test failed:", error);
+  }
+}
+
+main();

integration-test/app-worker-thread/test.sh

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+#!/usr/bin/env bash
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"
+set -ex
+
+$DIR/../../pkg/wds.bin.js $@ $DIR/run.ts | grep "IT WORKED"