Memory leak test of require-uncached

readme.md

Run:

• node memory-leak.js
• node node fixed-memory-leak.js

Output will be four heapdumps files with coresponding names. Heapdumps can be inspected via Chrome Devtools.

fixed-memory-leak.js

const heapdump = require('heapdump');
const uncached = require('./require-uncached-patch.js');

let i;

for (i = 0; i < 100000; i++) {
  require('./module.js')();
}

heapdump.writeSnapshot('./FixedMemoryLeakBefore-' + Date.now() + '.heapsnapshot');

for (i=0; i < 100000; i++) {
  uncached('./module.js')();
}

heapdump.writeSnapshot('./FixedMemoryLeakAfter-' + Date.now() + '.heapsnapshot');

memory-leak.js

const heapdump = require('heapdump');
const uncached = require('require-uncached');

let i;

for (i = 0; i < 100000; i++) {
  require('./module.js')();
}

heapdump.writeSnapshot('./MemoryLeakBefore-' + Date.now() + '.heapsnapshot');

for (i=0; i < 100000; i++) {
  uncached('./module.js')();
}

heapdump.writeSnapshot('./MemoryLeakAfter-' + Date.now() + '.heapsnapshot');

module.js

module.exports = () => {};

package.json

{
  "name": "require-leak",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "heapdump": "~0.3.7",
    "require-uncached": "~1.0.2"
  }
}

require-uncached-patch.js

'use strict';
var path = require('path');
var resolveFrom = require('resolve-from');
var callerPath = require('caller-path');

module.exports = function (moduleId) {
	if (typeof moduleId !== 'string') {
		throw new TypeError('Expected a string');
	}

	var filePath = resolveFrom(path.dirname(callerPath()), moduleId);
	
	// delete itself from module parent
	if (require.cache[filePath] && require.cache[filePath].parent) {
		var i = require.cache[filePath].parent.children.length;
		while (i--) {
			if (require.cache[filePath].parent.children[i].id === filePath) {
				require.cache[filePath].parent.children.splice(i, 1);
			}
		}
	}
	// delete module from cache
	delete require.cache[filePath];
	
	// return fresh module
	return require(filePath);
};