Merge pull request #5997 from filipesilva/concatenated-module-identifier

Use shorter identifier for ConcatenatedModules

lib/optimize/ConcatenatedModule.js

@@ -7,6 +7,7 @@
 const Module = require("../Module");
 const Template = require("../Template");
 const Parser = require("../Parser");
+const crypto = require("crypto");
 const acorn = require("acorn");
 const escope = require("escope");
 const ReplaceSource = require("webpack-sources/lib/ReplaceSource");
@@ -210,6 +211,7 @@ class ConcatenatedModule extends Module {
 				Object.assign(this.assets, m.assets);
 			}
 		}
+		this._identifier = this._createIdentifier();
 	}
 
 	get modules() {
@@ -219,12 +221,7 @@ class ConcatenatedModule extends Module {
 	}
 
 	identifier() {
-		return this._orderedConcatenationList.map(info => {
-			switch(info.type) {
-				case "concatenated":
-					return info.module.identifier();
-			}
-		}).filter(Boolean).join(" ");
+		return this._identifier;
 	}
 
 	readableIdentifier(requestShortener) {
@@ -297,6 +294,18 @@ class ConcatenatedModule extends Module {
 		return list;
 	}
 
+	_createIdentifier() {
+		const orderedConcatenationListIdentifiers = this._orderedConcatenationList.map(info => {
+			switch(info.type) {
+				case "concatenated":
+					return info.module.identifier();
+			}
+		}).filter(Boolean).join(" ");
+		const hash = crypto.createHash("md5");
+		hash.update(orderedConcatenationListIdentifiers);
+		return this.rootModule.identifier() + " " + hash.digest("hex");
+	}
+
 	source(dependencyTemplates, outputOptions, requestShortener) {
 		// Metainfo for each module
 		const modulesWithInfo = this._orderedConcatenationList.map((info, idx) => {