1// Copyright Joyent, Inc. and other Node contributors. 2// 3// Permission is hereby granted, free of charge, to any person obtaining a 4// copy of this software and associated documentation files (the 5// "Software"), to deal in the Software without restriction, including 6// without limitation the rights to use, copy, modify, merge, publish, 7// distribute, sublicense, and/or sell copies of the Software, and to permit 8// persons to whom the Software is furnished to do so, subject to the 9// following conditions: 10// 11// The above copyright notice and this permission notice shall be included 12// in all copies or substantial portions of the Software. 13// 14// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 15// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 16// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN 17// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 18// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 19// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 20// USE OR OTHER DEALINGS IN THE SOFTWARE. 21 22'use strict'; 23// We've experienced a regression where the module loader stats a bunch of 24// directories on require() even if it's been called before. The require() 25// should caching the request. 26require('../common'); 27const fs = require('fs'); 28const assert = require('assert'); 29const { fixturesDir } = require('../common/fixtures'); 30 31let counter = 0; 32 33// Switch out the two stat implementations so that they increase a counter 34// each time they are called. 35 36const _statSync = fs.statSync; 37const _stat = fs.stat; 38 39fs.statSync = function() { 40 counter++; 41 return _statSync.apply(this, arguments); 42}; 43 44fs.stat = function() { 45 counter++; 46 return _stat.apply(this, arguments); 47}; 48 49// Load the module 'a' and 'http' once. It should become cached. 50require(`${fixturesDir}/a`); 51require('../fixtures/a.js'); 52require('./../fixtures/a.js'); 53require('http'); 54 55console.log(`counterBefore = ${counter}`); 56const counterBefore = counter; 57 58// Now load the module a bunch of times with equivalent paths. 59// stat should not be called. 60for (let i = 0; i < 100; i++) { 61 require(`${fixturesDir}/a`); 62 require('../fixtures/a.js'); 63 require('./../fixtures/a.js'); 64} 65 66// Do the same with a built-in module 67for (let i = 0; i < 100; i++) { 68 require('http'); 69} 70 71console.log(`counterAfter = ${counter}`); 72const counterAfter = counter; 73 74assert.strictEqual(counterBefore, counterAfter); 75