.

node_modules/stealthy-require/lib/index.js

@@ -0,0 +1,81 @@
+'use strict';
+
+var isNative = /\.node$/;
+
+function forEach(obj, callback) {
+    for ( var key in obj ) {
+        if (!Object.prototype.hasOwnProperty.call(obj, key)) {
+            continue;
+        }
+        callback(key);
+    }
+}
+
+function assign(target, source) {
+    forEach(source, function (key) {
+        target[key] = source[key];
+    });
+    return target;
+}
+
+function clearCache(requireCache) {
+    forEach(requireCache, function (resolvedPath) {
+        if (!isNative.test(resolvedPath)) {
+            delete requireCache[resolvedPath];
+        }
+    });
+}
+
+module.exports = function (requireCache, callback, callbackForModulesToKeep, module) {
+
+    var originalCache = assign({}, requireCache);
+    clearCache(requireCache);
+
+    if (callbackForModulesToKeep) {
+
+        var originalModuleChildren = module.children ? module.children.slice() : false; // Creates a shallow copy of module.children
+
+        callbackForModulesToKeep();
+
+        // Lists the cache entries made by callbackForModulesToKeep()
+        var modulesToKeep = [];
+        forEach(requireCache, function (key) {
+            modulesToKeep.push(key);
+        });
+
+        // Discards the modules required in callbackForModulesToKeep()
+        clearCache(requireCache);
+
+        if (module.children) { // Only true for node.js
+            module.children = originalModuleChildren; // Removes last references to modules required in callbackForModulesToKeep() -> No memory leak
+        }
+
+        // Takes the cache entries of the original cache in case the modules where required before
+        for ( var i = 0; i < modulesToKeep.length; i+=1 ) {
+            if (originalCache[modulesToKeep[i]]) {
+                requireCache[modulesToKeep[i]] = originalCache[modulesToKeep[i]];
+            }
+        }
+
+    }
+
+    var freshModule = callback();
+
+    var stealthCache = callbackForModulesToKeep ? assign({}, requireCache) : false;
+
+    clearCache(requireCache);
+
+    if (callbackForModulesToKeep) {
+        // In case modules to keep were required inside the stealthy require for the first time, copy them to the restored cache
+        for ( var k = 0; k < modulesToKeep.length; k+=1 ) {
+            if (stealthCache[modulesToKeep[k]]) {
+                requireCache[modulesToKeep[k]] = stealthCache[modulesToKeep[k]];
+            }
+        }
+    }
+
+    assign(requireCache, originalCache);
+
+    return freshModule;
+
+};