82 lines
2.3 KiB
JavaScript
82 lines
2.3 KiB
JavaScript
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'use strict';
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var isNative = /\.node$/;
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function forEach(obj, callback) {
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for ( var key in obj ) {
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if (!Object.prototype.hasOwnProperty.call(obj, key)) {
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continue;
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}
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callback(key);
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}
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}
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function assign(target, source) {
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forEach(source, function (key) {
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target[key] = source[key];
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});
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return target;
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}
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function clearCache(requireCache) {
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forEach(requireCache, function (resolvedPath) {
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if (!isNative.test(resolvedPath)) {
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delete requireCache[resolvedPath];
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}
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});
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}
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module.exports = function (requireCache, callback, callbackForModulesToKeep, module) {
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var originalCache = assign({}, requireCache);
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clearCache(requireCache);
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if (callbackForModulesToKeep) {
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var originalModuleChildren = module.children ? module.children.slice() : false; // Creates a shallow copy of module.children
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callbackForModulesToKeep();
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// Lists the cache entries made by callbackForModulesToKeep()
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var modulesToKeep = [];
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forEach(requireCache, function (key) {
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modulesToKeep.push(key);
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});
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// Discards the modules required in callbackForModulesToKeep()
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clearCache(requireCache);
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if (module.children) { // Only true for node.js
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module.children = originalModuleChildren; // Removes last references to modules required in callbackForModulesToKeep() -> No memory leak
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}
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// Takes the cache entries of the original cache in case the modules where required before
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for ( var i = 0; i < modulesToKeep.length; i+=1 ) {
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if (originalCache[modulesToKeep[i]]) {
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requireCache[modulesToKeep[i]] = originalCache[modulesToKeep[i]];
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}
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}
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}
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var freshModule = callback();
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var stealthCache = callbackForModulesToKeep ? assign({}, requireCache) : false;
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clearCache(requireCache);
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if (callbackForModulesToKeep) {
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// In case modules to keep were required inside the stealthy require for the first time, copy them to the restored cache
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for ( var k = 0; k < modulesToKeep.length; k+=1 ) {
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if (stealthCache[modulesToKeep[k]]) {
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requireCache[modulesToKeep[k]] = stealthCache[modulesToKeep[k]];
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}
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}
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}
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assign(requireCache, originalCache);
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return freshModule;
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};
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