add hw2

node_modules/thread-stream/test/on-message.js

@@ -0,0 +1,18 @@
+'use strict'
+
+const { parentPort } = require('worker_threads')
+const { Writable } = require('stream')
+
+function run () {
+  parentPort.once('message', function ({ text, takeThisPortPlease }) {
+    takeThisPortPlease.postMessage(`received: ${text}`)
+  })
+  return new Writable({
+    autoDestroy: true,
+    write (chunk, enc, cb) {
+      cb()
+    }
+  })
+}
+
+module.exports = run