From 840806e07ef1bba4848a317319812e9faae3dc0f Mon Sep 17 00:00:00 2001
From: rickyes <ives199511@gmail.com>
Date: Tue, 14 Jul 2020 13:55:45 +0800
Subject: [PATCH] stream: refactor lazyLoadPromises

PR-URL: https://github.com/nodejs/node/pull/34354
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Robert Nagy <ronagy@icloud.com>
Reviewed-By: Zeyu Yang <himself65@outlook.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
---
 lib/stream.js | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/lib/stream.js b/lib/stream.js
index ed6cc19753c806..9ea9a0ceeebbab 100644
--- a/lib/stream.js
+++ b/lib/stream.js
@@ -49,28 +49,30 @@ Stream.PassThrough = require('_stream_passthrough');
 Stream.pipeline = pipeline;
 Stream.finished = eos;
 
+function lazyLoadPromises() {
+  if (promises === null) promises = require('stream/promises');
+  return promises;
+}
+
 ObjectDefineProperty(Stream, 'promises', {
   configurable: true,
   enumerable: true,
   get() {
-    if (promises === null) promises = require('stream/promises');
-    return promises;
+    return lazyLoadPromises();
   }
 });
 
 ObjectDefineProperty(pipeline, customPromisify, {
   enumerable: true,
   get() {
-    if (promises === null) promises = require('stream/promises');
-    return promises.pipeline;
+    return lazyLoadPromises().pipeline;
   }
 });
 
 ObjectDefineProperty(eos, customPromisify, {
   enumerable: true,
   get() {
-    if (promises === null) promises = require('stream/promises');
-    return promises.finished;
+    return lazyLoadPromises().finished;
   }
 });