fix(node/worker_threads): data url not encoded properly with eval (#27184)

When using the `eval` option on Node's `worker_threads` the code is
passed as a `data:` URL. But we didn't encode the actual code for that,
which lead to syntax errors when including characters not allowed in an
URL.

Fixes a part of https://github.com/denoland/deno/issues/27167

ext/node/polyfills/worker_threads.ts

@@ -42,6 +42,7 @@ const {
   SafeWeakMap,
   SafeMap,
   TypeError,
+  encodeURIComponent,
 } = primordials;
 
 const debugWorkerThreads = false;
@@ -123,7 +124,11 @@ class NodeWorker extends EventEmitter {
       );
     }
     if (options?.eval) {
-      specifier = `data:text/javascript,${specifier}`;
+      const code = typeof specifier === "string"
+        ? encodeURIComponent(specifier)
+        // deno-lint-ignore prefer-primordials
+        : specifier.toString();
+      specifier = `data:text/javascript,${code}`;
     } else if (
       !(typeof specifier === "object" && specifier.protocol === "data:")
     ) {

tests/unit_node/worker_threads_test.ts

@@ -136,6 +136,25 @@ Deno.test({
   },
 });
 
+Deno.test({
+  name: "[node/worker_threads] Worker eval",
+  async fn() {
+    // Check that newlines are encoded properly
+    const worker = new workerThreads.Worker(
+      `
+      import { parentPort } from "node:worker_threads"
+      console.log("hey, foo") // comment
+      parentPort.postMessage("It works!");
+      `,
+      {
+        eval: true,
+      },
+    );
+    assertEquals((await once(worker, "message"))[0], "It works!");
+    worker.terminate();
+  },
+});
+
 Deno.test({
   name: "[node/worker_threads] worker thread with type module",
   async fn() {