From 466cda05484c612769effb8c61a9a8ea8379bef2 Mon Sep 17 00:00:00 2001
From: cjihrig <cjihrig@gmail.com>
Date: Mon, 10 Sep 2018 09:57:15 -0400
Subject: fs: ensure readdir() callback is only called once

This commit ensures that the readdir() callback can only be
called once when the withFileTypes parameter is supplied.

PR-URL: https://github.com/nodejs/node/pull/22793
Fixes: https://github.com/nodejs/node/issues/22778
Reviewed-By: Bryan English <bryan@bryanenglish.com>
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>
Reviewed-By: Minwoo Jung <minwoo@nodesource.com>
---
 lib/internal/util.js | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'lib/internal/util.js')

diff --git a/lib/internal/util.js b/lib/internal/util.js
index 43b9974068..5cb1b281ba 100644
--- a/lib/internal/util.js
+++ b/lib/internal/util.js
@@ -365,6 +365,15 @@ function isInsideNodeModules() {
   return false;
 }
 
+function once(callback) {
+  let called = false;
+  return function(...args) {
+    if (called) return;
+    called = true;
+    callback(...args);
+  };
+}
+
 module.exports = {
   assertCrypto,
   cachedResult,
@@ -381,6 +390,7 @@ module.exports = {
   join,
   normalizeEncoding,
   objectToString,
+  once,
   promisify,
   spliceOne,
   removeColors,
-- 
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