tools: add no-duplicate-requires rule

PR-URL: https://github.com/nodejs/node/pull/21712
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: Weijia Wang <starkwang@126.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Jon Moss <me@jonathanmoss.me>

1 files changed, 2 insertions, 2 deletions

diff --git a/doc/api/worker_threads.md b/doc/api/worker_threads.md
index d20fd0fce5..8b301f42a8 100644
--- a/doc/api/worker_threads.md
+++ b/doc/api/worker_threads.md
@@ -286,7 +286,7 @@ For example:
 ```js
 const assert = require('assert');
 const {
-  Worker, MessageChannel, MessagePort, isMainThread
+  Worker, MessageChannel, MessagePort, isMainThread, parentPort
 } = require('worker_threads');
 if (isMainThread) {
   const worker = new Worker(__filename);
@@ -296,7 +296,7 @@ if (isMainThread) {
     console.log('received:', value);
   });
 } else {
-  require('worker_threads').once('message', (value) => {
+  parentPort.once('message', (value) => {
     assert(value.hereIsYourPort instanceof MessagePort);
     value.hereIsYourPort.postMessage('the worker is sending this');
     value.hereIsYourPort.close();