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node_modules/webpack/lib/NamedModulesPlugin.js

@@ -4,21 +4,51 @@
 */
 "use strict";
 
+const createHash = require("./util/createHash");
+const RequestShortener = require("./RequestShortener");
+
+const getHash = str => {
+	const hash = createHash("md4");
+	hash.update(str);
+	return hash.digest("hex").substr(0, 4);
+};
+
 class NamedModulesPlugin {
 	constructor(options) {
 		this.options = options || {};
 	}
 
 	apply(compiler) {
-		compiler.plugin("compilation", (compilation) => {
-			compilation.plugin("before-module-ids", (modules) => {
-				modules.forEach((module) => {
-					if(module.id === null && module.libIdent) {
-						module.id = module.libIdent({
-							context: this.options.context || compiler.options.context
-						});
+		compiler.hooks.compilation.tap("NamedModulesPlugin", compilation => {
+			compilation.hooks.beforeModuleIds.tap("NamedModulesPlugin", modules => {
+				const namedModules = new Map();
+				const context = this.options.context || compiler.options.context;
+
+				for (const module of modules) {
+					if (module.id === null && module.libIdent) {
+						module.id = module.libIdent({ context });
 					}
-				});
+
+					if (module.id !== null) {
+						const namedModule = namedModules.get(module.id);
+						if (namedModule !== undefined) {
+							namedModule.push(module);
+						} else {
+							namedModules.set(module.id, [module]);
+						}
+					}
+				}
+
+				for (const namedModule of namedModules.values()) {
+					if (namedModule.length > 1) {
+						for (const module of namedModule) {
+							const requestShortener = new RequestShortener(context);
+							module.id = `${module.id}?${getHash(
+								requestShortener.shorten(module.identifier())
+							)}`;
+						}
+					}
+				}
 			});
 		});
 	}