fs: lazy load createPromise/promiseResolve

PR-URL: #20766
Reviewed-By: Joyee Cheung <[email protected]>
Reviewed-By: Michaël Zasso <[email protected]>
Reviewed-By: Minwoo Jung <[email protected]>
Reviewed-By: Tiancheng "Timothy" Gu <[email protected]>
Reviewed-By: Benjamin Gruenbaum <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>

Author: jasnell

lib/fs.js

@@ -44,7 +44,6 @@ const {
 const util = require('util');
 const pathModule = require('path');
 const { isUint8Array } = require('internal/util/types');
-const { createPromise, promiseResolve } = process.binding('util');
 
 const binding = process.binding('fs');
 const fs = exports;
@@ -250,6 +249,7 @@ fs.exists = function(path, callback) {
 
 Object.defineProperty(fs.exists, internalUtil.promisify.custom, {
   value: (path) => {
+    const { createPromise, promiseResolve } = process.binding('util');
     const promise = createPromise();
     fs.exists(path, (exists) => promiseResolve(promise, exists));
     return promise;