Backport performance improvements and devtool fixes to webpack 2

.travis.yml

@@ -4,6 +4,7 @@ language: node_js
 branches:
   only:
     - master
+    - webpack-2
 
 cache:
   directories:
@@ -13,10 +14,10 @@ cache:
 matrix:
   include:
     - os: linux
-      node_js: "7"
+      node_js: "8"
       env: NO_WATCH_TESTS=1 JOB_PART=lint
     - os: linux
-      node_js: "7"
+      node_js: "8"
       env: NO_WATCH_TESTS=1 JOB_PART=test
     - os: linux
       node_js: "6"

appveyor.yml

@@ -4,6 +4,7 @@
 branches:
   only:
     - master
+    - webpack-2
 
 init:
   - git config --global core.autocrlf input
@@ -13,17 +14,17 @@ clone_depth: 50
 # what combinations to test
 environment:
   matrix:
-    - nodejs_version: 7
+    - nodejs_version: 8
       job_part: test
     - nodejs_version: 6
       job_part: test
 
 install:
   - ps: Install-Product node $env:nodejs_version x64
   - npm install yarn -g
-  - yarn install
-  - yarn link || yarn link
-  - yarn link webpack
+  - yarn install --frozen-lockfile
+  - yarn link --frozen-lockfile || yarn link --frozen-lockfile
+  - yarn link webpack --frozen-lockfile
 
 build: off
 

ci/travis-install.sh

@@ -1,5 +1,7 @@
 #!/bin/bash
 set -ev
 
-yarn link || true && yarn link webpack;
+yarn link --frozen-lockfile || true && yarn link webpack --frozen-lockfile;
+
+yarn --frozen-lockfile
 

circle.yml

@@ -8,7 +8,7 @@ machine:
 
 dependencies:
   pre:
-    - case $CIRCLE_NODE_INDEX in 0) NODE_VERSION=4 ;; 1) NODE_VERSION=7 ;; esac; nvm install $NODE_VERSION && nvm alias default $NODE_VERSION
+    - case $CIRCLE_NODE_INDEX in 0) NODE_VERSION=4 ;; 1) NODE_VERSION=8 ;; esac; nvm install $NODE_VERSION && nvm alias default $NODE_VERSION
   override:
     - yarn
     - yarn link || true && yarn link webpack

lib/EvalSourceMapDevToolModuleTemplatePlugin.js

@@ -10,7 +10,7 @@ const ModuleFilenameHelpers = require("./ModuleFilenameHelpers");
 class EvalSourceMapDevToolModuleTemplatePlugin {
 	constructor(compilation, options) {
 		this.compilation = compilation;
-		this.sourceMapComment = options.append || "//# sourceMappingURL=[url]";
+		this.sourceMapComment = options.append || "//# sourceURL=[module]\n//# sourceMappingURL=[url]";
 		this.moduleFilenameTemplate = options.moduleFilenameTemplate || "webpack:///[resource-path]?[hash]";
 		this.options = options;
 	}
@@ -61,13 +61,14 @@ class EvalSourceMapDevToolModuleTemplatePlugin {
 			sourceMap.sourceRoot = options.sourceRoot || "";
 			sourceMap.file = `${module.id}.js`;
 
-			const footer = self.sourceMapComment.replace(/\[url\]/g, `data:application/json;charset=utf-8;base64,${new Buffer(JSON.stringify(sourceMap), "utf8").toString("base64")}`); //eslint-disable-line
+			const footer = self.sourceMapComment.replace(/\[url\]/g, `data:application/json;charset=utf-8;base64,${new Buffer(JSON.stringify(sourceMap), "utf8").toString("base64")}`) + //eslint-disable-line
+				`\n//# sourceURL=webpack-internal:///${module.id}\n`; // workaround for chrome bug
 			source.__EvalSourceMapDevToolData = new RawSource(`eval(${JSON.stringify(content + footer)});`);
 			return source.__EvalSourceMapDevToolData;
 		});
 		moduleTemplate.plugin("hash", function(hash) {
 			hash.update("eval-source-map");
-			hash.update("1");
+			hash.update("2");
 		});
 	}
 }

lib/SourceMapDevToolPlugin.js

@@ -5,6 +5,7 @@
 "use strict";
 
 const path = require("path");
+const crypto = require("crypto");
 const RequestShortener = require("./RequestShortener");
 const ConcatSource = require("webpack-sources").ConcatSource;
 const RawSource = require("webpack-sources").RawSource;
@@ -131,6 +132,7 @@ class SourceMapDevToolPlugin {
 					if(currentSourceMappingURLComment !== false && /\.css($|\?)/i.test(file)) {
 						currentSourceMappingURLComment = currentSourceMappingURLComment.replace(/^\n\/\/(.*)$/, "\n/*$1*/");
 					}
+					const sourceMapString = JSON.stringify(sourceMap);
 					if(sourceMapFilename) {
 						let filename = file;
 						let query = "";
@@ -139,22 +141,25 @@ class SourceMapDevToolPlugin {
 							query = filename.substr(idx);
 							filename = filename.substr(0, idx);
 						}
-						const sourceMapFile = compilation.getPath(sourceMapFilename, {
+						let sourceMapFile = compilation.getPath(sourceMapFilename, {
 							chunk,
 							filename,
 							query,
 							basename: basename(filename)
 						});
+						if(sourceMapFile.indexOf("[contenthash]") !== -1) {
+							sourceMapFile = sourceMapFile.replace(/\[contenthash\]/g, crypto.createHash("md5").update(sourceMapString).digest("hex"));
+						}
 						const sourceMapUrl = path.relative(path.dirname(file), sourceMapFile).replace(/\\/g, "/");
 						if(currentSourceMappingURLComment !== false) {
 							asset.__SourceMapDevToolData[file] = compilation.assets[file] = new ConcatSource(new RawSource(source), currentSourceMappingURLComment.replace(/\[url\]/g, sourceMapUrl));
 						}
-						asset.__SourceMapDevToolData[sourceMapFile] = compilation.assets[sourceMapFile] = new RawSource(JSON.stringify(sourceMap));
+						asset.__SourceMapDevToolData[sourceMapFile] = compilation.assets[sourceMapFile] = new RawSource(sourceMapString);
 						chunk.files.push(sourceMapFile);
 					} else {
 						asset.__SourceMapDevToolData[file] = compilation.assets[file] = new ConcatSource(new RawSource(source), currentSourceMappingURLComment
-							.replace(/\[map\]/g, () => JSON.stringify(sourceMap))
-							.replace(/\[url\]/g, () => `data:application/json;charset=utf-8;base64,${new Buffer(JSON.stringify(sourceMap), "utf-8").toString("base64")}`) // eslint-disable-line
+							.replace(/\[map\]/g, () => sourceMapString)
+							.replace(/\[url\]/g, () => `data:application/json;charset=utf-8;base64,${new Buffer(sourceMapString, "utf-8").toString("base64")}`) // eslint-disable-line
 						);
 					}
 				});

package.json

@@ -9,7 +9,7 @@
     "ajv": "^4.7.0",
     "ajv-keywords": "^1.1.1",
     "async": "^2.1.2",
-    "enhanced-resolve": "^3.0.0",
+    "enhanced-resolve": "^3.3.0",
     "interpret": "^1.0.0",
     "json-loader": "^0.5.4",
     "json5": "^0.5.1",
@@ -23,7 +23,7 @@
     "tapable": "~0.2.5",
     "uglify-js": "^2.8.27",
     "watchpack": "^1.3.1",
-    "webpack-sources": "^0.2.3",
+    "webpack-sources": "^1.0.1",
     "yargs": "^6.0.0"
   },
   "license": "MIT",
@@ -88,23 +88,23 @@
     "schemas/"
   ],
   "scripts": {
-    "test": "mocha test/*.test.js --harmony --check-leaks",
+    "test": "mocha test/*.test.js --max_old_space_size=4096 --harmony --check-leaks",
     "travis:test": "npm run cover:min",
     "travis:lint": "npm run lint-files && npm run nsp",
     "travis:benchmark": "npm run benchmark",
-    "appveyor:test": "node --max_old_space_size=4096 node_modules\\mocha\\bin\\mocha --harmony test/*.test.js",
+    "appveyor:test": "node node_modules\\mocha\\bin\\mocha --max_old_space_size=4096 --harmony test/*.test.js",
     "appveyor:benchmark": "npm run benchmark",
-    "circleci:test": "node --max_old_space_size=4096 node_modules/mocha/bin/mocha --harmony test/*.test.js",
+    "circleci:test": "node node_modules/mocha/bin/mocha --max_old_space_size=4096 --harmony test/*.test.js",
     "circleci:lint": "npm run lint-files && npm run nsp",
     "build:examples": "cd examples && node buildAll.js",
     "pretest": "npm run lint-files",
     "lint-files": "npm run lint && npm run beautify-lint",
     "lint": "eslint lib bin hot buildin \"test/**/webpack.config.js\" \"test/binCases/**/test.js\" \"examples/**/webpack.config.js\"",
     "beautify-lint": "beautify-lint \"lib/**/*.js\" \"hot/**/*.js\" \"bin/**/*.js\" \"benchmark/*.js\" \"test/*.js\"",
     "nsp": "nsp check --output summary",
-    "benchmark": "mocha test/*.benchmark.js --harmony -R spec",
-    "cover": "node --harmony ./node_modules/istanbul/lib/cli.js cover -x '**/*.runtime.js' node_modules/mocha/bin/_mocha -- test/*.test.js",
-    "cover:min": "node --harmony ./node_modules/.bin/istanbul cover -x '**/*.runtime.js' --report lcovonly node_modules/mocha/bin/_mocha -- test/*.test.js",
+    "benchmark": "mocha --max_old_space_size=4096 --harmony test/*.benchmark.js -R spec",
+    "cover": "node --max_old_space_size=4096 --harmony ./node_modules/istanbul/lib/cli.js cover -x '**/*.runtime.js' node_modules/mocha/bin/_mocha -- test/*.test.js",
+    "cover:min": "node --max_old_space_size=4096 --harmony ./node_modules/.bin/istanbul cover -x '**/*.runtime.js' --report lcovonly node_modules/mocha/bin/_mocha -- test/*.test.js",
     "publish-patch": "npm run lint && npm run beautify-lint && mocha && npm version patch && git push && git push --tags && npm publish"
   }
 }

schemas/webpackOptionsSchema.json

@@ -459,6 +459,9 @@
         "cachePredicate": {
           "instanceof": "Function"
         },
+        "cacheWithContext": {
+          "type": "boolean"
+        },
         "descriptionFiles": {
           "$ref": "#/definitions/common.arrayOfStringValues"
         },

test/configCases/source-map/source-map-filename-contenthash/index.js

@@ -0,0 +1,6 @@
+it("should contain contenthash as query parameter and path", function() {
+	var fs = require("fs");
+	var source = fs.readFileSync(__filename, "utf-8");
+	var match = /sourceMappingURL\s*=.*-([A-Fa-f0-9]{32})\.map\?([A-Fa-f0-9]{32})-([A-Fa-f0-9]{32})/.exec(source);
+	match.length.should.be.eql(4);
+});

test/configCases/source-map/source-map-filename-contenthash/webpack.config.js

@@ -0,0 +1,16 @@
+var webpack = require("../../../../");
+module.exports = {
+	node: {
+		__dirname: false,
+		__filename: false
+	},
+	devtool: "source-map",
+	output: {
+		sourceMapFilename: "[file]-[contenthash].map?[contenthash]-[contenthash]",
+	},
+	plugins: [
+		new webpack.optimize.UglifyJsPlugin({
+			sourceMap: true
+		})
+	]
+};

yarn.lock

@@ -1086,9 +1086,9 @@ encoding@^0.1.11:
   dependencies:
     iconv-lite "~0.4.13"
 
-enhanced-resolve@^3.0.0:
-  version "3.1.0"
-  resolved "https://registry.yarnpkg.com/enhanced-resolve/-/enhanced-resolve-3.1.0.tgz#9f4b626f577245edcf4b2ad83d86e17f4f421dec"
+enhanced-resolve@^3.3.0:
+  version "3.3.0"
+  resolved "https://registry.yarnpkg.com/enhanced-resolve/-/enhanced-resolve-3.3.0.tgz#950964ecc7f0332a42321b673b38dc8ff15535b3"
   dependencies:
     graceful-fs "^4.1.2"
     memory-fs "^0.4.0"
@@ -3689,9 +3689,9 @@ source-list-map@^0.1.4, source-list-map@~0.1.7:
   version "0.1.8"
   resolved "https://registry.yarnpkg.com/source-list-map/-/source-list-map-0.1.8.tgz#c550b2ab5427f6b3f21f5afead88c4f5587b2106"
 
-source-list-map@^1.1.1:
-  version "1.1.2"
-  resolved "https://registry.yarnpkg.com/source-list-map/-/source-list-map-1.1.2.tgz#9889019d1024cce55cdc069498337ef6186a11a1"
+source-list-map@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/source-list-map/-/source-list-map-2.0.0.tgz#aaa47403f7b245a92fbc97ea08f250d6087ed085"
 
 source-map@0.4.x, source-map@^0.4.4:
   version "0.4.4"
@@ -4158,11 +4158,11 @@ webpack-sources@^0.1.0:
     source-list-map "~0.1.7"
     source-map "~0.5.3"
 
-webpack-sources@^0.2.3:
-  version "0.2.3"
-  resolved "https://registry.yarnpkg.com/webpack-sources/-/webpack-sources-0.2.3.tgz#17c62bfaf13c707f9d02c479e0dcdde8380697fb"
+webpack-sources@^1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/webpack-sources/-/webpack-sources-1.0.1.tgz#c7356436a4d13123be2e2426a05d1dad9cbe65cf"
   dependencies:
-    source-list-map "^1.1.1"
+    source-list-map "^2.0.0"
     source-map "~0.5.3"
 
 whatwg-fetch@>=0.10.0: