feat(runtime/worker): Structured cloning worker message passing (#9323)

This commit upgrade "Worker.postMessage()" implementation to use 
structured clone algorithm instead of non-spec compliant JSON serialization.

1 files changed, 31 insertions, 0 deletions

diff --git a/cli/tests/workers/bench_large_message.ts b/cli/tests/workers/bench_large_message.ts
new file mode 100644
index 000000000..53076e711
--- /dev/null
+++ b/cli/tests/workers/bench_large_message.ts
@@ -0,0 +1,31 @@
+// Copyright 2020 the Deno authors. All rights reserved. MIT license.
+
+function oneWorker(i: number) {
+  return new Promise<void>((resolve) => {
+    let countDown = 10;
+    const worker = new Worker(
+      new URL("worker_large_message.js", import.meta.url).href,
+      { type: "module" },
+    );
+    worker.onmessage = (e): void => {
+      if (countDown > 0) {
+        countDown--;
+        return;
+      }
+      worker.terminate();
+      resolve();
+    };
+    worker.postMessage("hi " + i);
+  });
+}
+
+function bench() {
+  const promises = [];
+  for (let i = 0; i < 50; i++) {
+    promises.push(oneWorker(i));
+  }
+
+  return Promise.all(promises);
+}
+
+bench();