From 5f032a7a269b66d48505869b0ae4fb1db403b118 Mon Sep 17 00:00:00 2001
From: ZYSzys <zyszys98@gmail.com>
Date: Tue, 19 Mar 2019 14:00:49 +0800
Subject: util: extract uncurryThis function for reuse

PR-URL: https://github.com/nodejs/node/pull/23081
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Weijia Wang <starkwang@126.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Denys Otrishko <shishugi@gmail.com>
Reviewed-By: John-David Dalton <john.david.dalton@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
---
 lib/internal/util.js | 12 ++++++++++++
 1 file changed, 12 insertions(+)

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

diff --git a/lib/internal/util.js b/lib/internal/util.js
index bb2a101c4e..f5b5fbedd4 100644
--- a/lib/internal/util.js
+++ b/lib/internal/util.js
@@ -385,6 +385,17 @@ function once(callback) {
   };
 }
 
+const ReflectApply = Reflect.apply;
+
+// This function is borrowed from the function with the same name on V8 Extras'
+// `utils` object. V8 implements Reflect.apply very efficiently in conjunction
+// with the spread syntax, such that no additional special case is needed for
+// function calls w/o arguments.
+// Refs: https://github.com/v8/v8/blob/d6ead37d265d7215cf9c5f768f279e21bd170212/src/js/prologue.js#L152-L156
+function uncurryThis(func) {
+  return (thisArg, ...args) => ReflectApply(func, thisArg, args);
+}
+
 module.exports = {
   assertCrypto,
   cachedResult,
@@ -405,6 +416,7 @@ module.exports = {
   promisify,
   spliceOne,
   removeColors,
+  uncurryThis,
 
   // Symbol used to customize promisify conversion
   customPromisifyArgs: kCustomPromisifyArgsSymbol,
-- 
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