improve HotModuleReplacementPlugin performance

sokra · sokra · commit f2e5c1e9e817 · 2018-05-01T10:53:59.000+02:00
avoid unnessecary rehashing
diff --git a/lib/HotModuleReplacementPlugin.js b/lib/HotModuleReplacementPlugin.js
@@ -12,7 +12,6 @@ const ModuleHotDeclineDependency = require("./dependencies/ModuleHotDeclineDepen
 const ConstDependency = require("./dependencies/ConstDependency");
 const NullFactory = require("./NullFactory");
 const ParserHelpers = require("./ParserHelpers");
-const createHash = require("./util/createHash");
 
 module.exports = class HotModuleReplacementPlugin {
 	constructor(options) {
@@ -74,9 +73,7 @@ module.exports = class HotModuleReplacementPlugin {
 						records.moduleHashs = {};
 						for (const module of compilation.modules) {
 							const identifier = module.identifier();
-							const hash = createHash(compilation.outputOptions.hashFunction);
-							module.updateHash(hash);
-							records.moduleHashs[identifier] = hash.digest("hex");
+							records.moduleHashs[identifier] = module.hash;
 						}
 						records.chunkHashs = {};
 						for (const chunk of compilation.chunks) {
@@ -136,9 +133,7 @@ module.exports = class HotModuleReplacementPlugin {
 							return;
 						for (const module of compilation.modules) {
 							const identifier = module.identifier();
-							let hash = createHash(compilation.outputOptions.hashFunction);
-							module.updateHash(hash);
-							hash = hash.digest("hex");
+							let hash = module.hash;
 							module.hotUpdate = records.moduleHashs[identifier] !== hash;
 						}
 						const hotUpdateMainContent = {
