Add webpack benchmark

jest.config.js

@@ -0,0 +1,7 @@
+const path = require("path");
+
+module.exports = {
+  watchPathIgnorePatterns: [
+    path.resolve(__dirname, "build")
+  ]
+}

src/fixtures/webpack/a.js

@@ -0,0 +1,5 @@
+import b from "./b.js";
+
+const message = import("./c.js").then(c => c.default + b);
+
+export default message;

src/fixtures/webpack/b.js

@@ -0,0 +1 @@
+module.exports = 42;

src/fixtures/webpack/c.js

@@ -0,0 +1 @@
+export default "Hello world";

src/mocks/chokidar/index.js

@@ -0,0 +1,3 @@
+module.exports = {
+  watch: () => {}
+};

src/suite.js

@@ -22,5 +22,6 @@ suite.add(require("./source-map-benchmark"));
 suite.add(require("./typescript-benchmark"));
 suite.add(require("./uglify-js-benchmark"));
 suite.add(require("./uglify-es-benchmark"));
+suite.add(require("./webpack-benchmark"));
 
 module.exports = suite;

src/vfs.js

@@ -79,5 +79,18 @@ fs.writeFileSync(
   "third_party/vue.runtime.esm-nobuble-2.4.4.js",
   require("raw-loader!../third_party/vue.runtime.esm-nobuble-2.4.4.js")
 );
+fs.mkdirpSync("/src/fixtures/webpack");
+fs.writeFileSync(
+  "/src/fixtures/webpack/a.js",
+  require("raw-loader!./fixtures/webpack/a.js")
+);
+fs.writeFileSync(
+  "/src/fixtures/webpack/b.js",
+  require("raw-loader!./fixtures/webpack/b.js")
+);
+fs.writeFileSync(
+  "/src/fixtures/webpack/c.js",
+  require("raw-loader!./fixtures/webpack/c.js")
+);
 
 module.exports = fs;

src/webpack-benchmark.js

@@ -0,0 +1,37 @@
+// Copyright 2017 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+const webpack = require("webpack");
+
+const payloads = [
+  {
+    entry: "/src/fixtures/webpack/a.js"
+  }
+].map(({ entry }, i) => ({
+  entry,
+  output: {
+    path: "/dist/webpack/",
+    filename: `bundle.${i}.js`
+  },
+  // Using bail option in order to receive noisy errors in the benchmark if something went wrong
+  bail: true,
+  // We need to define that because Firefox has a Object.prototype.watch function
+  watch: false
+}));
+
+module.exports = {
+  name: "webpack",
+  defer: true,
+  fn(deferred) {
+    return Promise.all(
+      payloads.map(
+        config =>
+          new Promise((resolve, reject) => {
+            const compiler = webpack(config);
+            compiler.run((err, stats) => void (err ? reject(err) : resolve()));
+          })
+      )
+    ).then(() => deferred.resolve());
+  }
+};

src/webpack-benchmark.test.js

@@ -0,0 +1,45 @@
+// Copyright 2017 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+const path = require("path");
+const webpack = require("webpack");
+const webpackConfig = require("../webpack.config.js");
+
+const outputFile = path.resolve(
+  __dirname,
+  "..",
+  "build",
+  "webpack-benchmark.test.js"
+);
+let webpackBenchmark;
+
+beforeAll(
+  () =>
+    new Promise((resolve, reject) => {
+      const baseConfig = webpackConfig[0];
+      const config = Object.assign({}, baseConfig, {
+        entry: require.resolve("./webpack-benchmark.js"),
+        bail: true
+      });
+      config.output = Object.assign({}, baseConfig.output, {
+        libraryTarget: "commonjs2",
+        path: path.dirname(outputFile),
+        filename: path.basename(outputFile)
+      });
+      const compiler = webpack(config);
+      compiler.run(err => {
+        if (err) {
+          reject(err);
+          return;
+        }
+        webpackBenchmark = require(outputFile);
+        resolve();
+      });
+    })
+);
+
+it("webpack runs to completion", () =>
+  new Promise(resolve => {
+    webpackBenchmark.fn({ resolve });
+  }));

webpack.config.js

@@ -19,7 +19,10 @@ module.exports = [
     resolve: {
       alias: {
         fs: require.resolve("./src/vfs"),
-        module: require.resolve("./src/mocks/dummy")
+        "graceful-fs": require.resolve("./src/vfs"),
+        module: require.resolve("./src/mocks/dummy"),
+        chokidar: require.resolve("./src/mocks/chokidar"),
+        "uglify-js": require.resolve("./src/mocks/dummy")
       }
     },
     plugins: [
@@ -46,7 +49,10 @@ module.exports = [
       alias: {
         define: require.resolve("./src/mocks/dummy"),
         fs: require.resolve("./src/vfs"),
-        module: require.resolve("./src/mocks/dummy")
+        "graceful-fs": require.resolve("./src/vfs"),
+        module: require.resolve("./src/mocks/dummy"),
+        chokidar: require.resolve("./src/mocks/chokidar"),
+        "uglify-js": require.resolve("./src/mocks/dummy")
       }
     },
     plugins: [