diff --git a/.babelrc.js b/.babelrc.js
index 97f74e90d298..c58ed0e9a401 100644
--- a/.babelrc.js
+++ b/.babelrc.js
@@ -1,9 +1,14 @@
 module.exports = {
-  presets: ['@babel/preset-env', '@babel/preset-react', '@babel/preset-flow'],
+  presets: [
+    ['@babel/preset-env', { shippedProposals: true }],
+    '@babel/preset-react',
+    '@babel/preset-flow',
+  ],
   plugins: [
     'babel-plugin-emotion',
     'babel-plugin-macros',
     '@babel/plugin-proposal-class-properties',
+    '@babel/plugin-proposal-object-rest-spread',
     '@babel/plugin-proposal-export-default-from',
     [
       '@babel/plugin-transform-runtime',
@@ -20,7 +25,7 @@ module.exports = {
   overrides: [
     {
       test: './examples/vue-kitchen-sink',
-      presets: ['@babel/preset-env', 'babel-preset-vue'],
+      presets: [['@babel/preset-env', { shippedProposals: true }], 'babel-preset-vue'],
     },
     {
       test: [
diff --git a/.eslintignore b/.eslintignore
index 73f2bb84a21b..e8aacb9b8fa0 100644
--- a/.eslintignore
+++ b/.eslintignore
@@ -1,4 +1,5 @@
 dist
+lib/**/dll
 build
 coverage
 node_modules
diff --git a/.eslintrc.js b/.eslintrc.js
index 917bf9b00706..6de2f6ae78be 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -123,6 +123,12 @@ module.exports = {
     ],
   },
   overrides: [
+    {
+      files: ['**/__tests__/**', '**/*.test.js/**', '**/*.spec.js/**'],
+      rules: {
+        'import/no-extraneous-dependencies': ignore,
+      },
+    },
     {
       files: ['**/react-native*/**', '**/REACT_NATIVE*/**', '**/crna*/**'],
       rules: {
diff --git a/.gitignore b/.gitignore
index a1bdccd96d11..0ed76d9dcdc0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -23,3 +23,4 @@ integration/__image_snapshots__/__diff_output__
 .jest-test-results.json
 /examples/cra-kitchen-sink/src/__image_snapshots__/__diff_output__/
 lib/*.jar
+lib/**/dll
diff --git a/.teamcity/OpenSourceProjects_Storybook/buildTypes/OpenSourceProjects_Storybook_Bootstrap.kt b/.teamcity/OpenSourceProjects_Storybook/buildTypes/OpenSourceProjects_Storybook_Bootstrap.kt
index f18d4aaf8682..f609d196a3ea 100644
--- a/.teamcity/OpenSourceProjects_Storybook/buildTypes/OpenSourceProjects_Storybook_Bootstrap.kt
+++ b/.teamcity/OpenSourceProjects_Storybook/buildTypes/OpenSourceProjects_Storybook_Bootstrap.kt
@@ -17,6 +17,7 @@ object OpenSourceProjects_Storybook_Bootstrap : BuildType({
         addons/storyshots/*/dist/** => dist.zip/addons/storyshots
         app/*/dist/** => dist.zip/app
         lib/*/dist/** => dist.zip/lib
+        lib/core/dll/** => dist.zip/lib/core/dll
     """.trimIndent()
 
     vcs {
diff --git a/.teamcity/OpenSourceProjects_Storybook/buildTypes/OpenSourceProjects_Storybook_Examples.kt b/.teamcity/OpenSourceProjects_Storybook/buildTypes/OpenSourceProjects_Storybook_Examples.kt
index 53ee4bd40753..2fe164bb30e9 100644
--- a/.teamcity/OpenSourceProjects_Storybook/buildTypes/OpenSourceProjects_Storybook_Examples.kt
+++ b/.teamcity/OpenSourceProjects_Storybook/buildTypes/OpenSourceProjects_Storybook_Examples.kt
@@ -12,10 +12,10 @@ object OpenSourceProjects_Storybook_Examples : BuildType({
     name = "Examples"
 
     artifactRules = """
-${StorybookApp.values().map { it.artifactPath }.joinToString("\n")}
-examples/official-storybook/storybook-static => official.zip
-examples/official-storybook/image-snapshots/__image_snapshots__ => image-snapshots
-""".trimIndent()
+        ${StorybookApp.values().map { it.artifactPath }.joinToString("\n")}
+        examples/official-storybook/storybook-static => official.zip
+        examples/official-storybook/image-snapshots/__image_snapshots__ => image-snapshots
+    """.trimIndent()
 
     vcs {
         root(OpenSourceProjects_Storybook.vcsRoots.OpenSourceProjects_Storybook_HttpsGithubComStorybooksStorybookRefsHeadsMaster)
diff --git a/.teamcity/OpenSourceProjects_Storybook/buildTypes/StorybookApp.kt b/.teamcity/OpenSourceProjects_Storybook/buildTypes/StorybookApp.kt
index 93a9b13b25d7..3f043631ceea 100644
--- a/.teamcity/OpenSourceProjects_Storybook/buildTypes/StorybookApp.kt
+++ b/.teamcity/OpenSourceProjects_Storybook/buildTypes/StorybookApp.kt
@@ -82,7 +82,9 @@ enum class StorybookApp(val appName: String, val exampleDir: String, val merged:
                 }
 
                 artifacts {
-                    artifactRules = "dist.zip!**"
+                    artifactRules = """
+                        dist.zip!**
+                    """.trimIndent()
                 }
             }
         }
diff --git a/addons/backgrounds/package.json b/addons/backgrounds/package.json
index 27c85249afd4..c6fe0901734f 100644
--- a/addons/backgrounds/package.json
+++ b/addons/backgrounds/package.json
@@ -30,6 +30,7 @@
     "@emotion/styled": "^0.10.6",
     "@storybook/addons": "4.1.0-alpha.9",
     "@storybook/core-events": "4.1.0-alpha.9",
+    "eventemitter3": "^3.1.0",
     "global": "^4.3.2",
     "prop-types": "^15.6.2",
     "util-deprecate": "^1.0.2"
diff --git a/addons/backgrounds/src/__tests__/BackgroundPanel.js b/addons/backgrounds/src/__tests__/BackgroundPanel.js
index 6cdee1c901bb..c1591f483926 100644
--- a/addons/backgrounds/src/__tests__/BackgroundPanel.js
+++ b/addons/backgrounds/src/__tests__/BackgroundPanel.js
@@ -1,6 +1,6 @@
 import React from 'react';
 import { shallow, mount } from 'enzyme';
-import EventEmitter from 'events';
+import EventEmitter from 'eventemitter3';
 
 import BackgroundPanel from '../BackgroundPanel';
 import Events from '../constants';
diff --git a/addons/options/README.md b/addons/options/README.md
index e678f0eb9dfd..4de59b4ac8db 100644
--- a/addons/options/README.md
+++ b/addons/options/README.md
@@ -137,7 +137,7 @@ To install type definitions: `npm install -D @types/storybook__addon-options`
 
 Make sure you also have the type definitions installed for the following libs:
 
- - node
- - react
+- node
+- react
  
 You can install them using `npm install -D @types/node @types/react`, assuming you are using Typescript >2.0.
diff --git a/lib/core/package.json b/lib/core/package.json
index dfe605dfa5b1..3f0be45700d0 100644
--- a/lib/core/package.json
+++ b/lib/core/package.json
@@ -6,9 +6,6 @@
     "storybook"
   ],
   "homepage": "https://github.com/storybooks/storybook/tree/master/lib/core",
-  "publishConfig": {
-    "access": "public"
-  },
   "bugs": {
     "url": "https://github.com/storybooks/storybook/issues"
   },
@@ -30,7 +27,6 @@
     "@emotion/core": "^0.13.1",
     "@emotion/provider": "^0.11.2",
     "@emotion/styled": "^0.10.6",
-    "@ndelangen/html-webpack-harddisk-plugin": "^0.2.0",
     "@storybook/addons": "4.1.0-alpha.9",
     "@storybook/channel-postmessage": "4.1.0-alpha.9",
     "@storybook/client-logger": "4.1.0-alpha.9",
@@ -53,10 +49,12 @@
     "detect-port": "^1.2.3",
     "dotenv-webpack": "^1.5.7",
     "ejs": "^2.6.1",
+    "eventemitter3": "^3.1.0",
     "express": "^4.16.3",
     "file-loader": "^2.0.0",
     "file-system-cache": "^1.0.5",
     "find-cache-dir": "^2.0.0",
+    "fs-extra": "^7.0.1",
     "global": "^4.3.2",
     "html-webpack-plugin": "^4.0.0-beta.2",
     "inquirer": "^6.2.0",
@@ -94,5 +92,8 @@
     "babel-loader": "^7.0.0 || ^8.0.0",
     "react": ">=16.3.0",
     "react-dom": ">=16.3.0"
+  },
+  "publishConfig": {
+    "access": "public"
   }
 }
diff --git a/lib/core/src/client/preview/story_store.js b/lib/core/src/client/preview/story_store.js
index cb96b7b6ca96..a2b5498105e4 100644
--- a/lib/core/src/client/preview/story_store.js
+++ b/lib/core/src/client/preview/story_store.js
@@ -1,5 +1,5 @@
 /* eslint no-underscore-dangle: 0 */
-import { EventEmitter } from 'events';
+import EventEmitter from 'eventemitter3';
 import Events from '@storybook/core-events';
 
 let count = 0;
diff --git a/lib/core/src/server/build-dev.js b/lib/core/src/server/build-dev.js
index 3956fc8e0725..ea9d878f5222 100644
--- a/lib/core/src/server/build-dev.js
+++ b/lib/core/src/server/build-dev.js
@@ -3,7 +3,7 @@ import https from 'https';
 import ip from 'ip';
 import favicon from 'serve-favicon';
 import path from 'path';
-import fs from 'fs';
+import fs from 'fs-extra';
 import chalk from 'chalk';
 import { logger, colors } from '@storybook/node-logger';
 import fetch from 'node-fetch';
@@ -21,12 +21,21 @@ import { getDevCli } from './cli';
 
 const defaultFavIcon = require.resolve('./public/favicon.ico');
 
+const cacheDir = findCacheDir({ name: 'storybook' });
 const cache = Cache({
-  basePath: findCacheDir({ name: 'storybook' }),
+  basePath: cacheDir,
   ns: 'storybook', // Optional. A grouping namespace for items.
 });
 
-function getServer(app, options) {
+const writeStats = async (name, stats) => {
+  await fs.writeFile(
+    path.join(cacheDir, `${name}-stats.json`),
+    JSON.stringify(stats.toJson(), null, 2),
+    'utf8'
+  );
+};
+
+async function getServer(app, options) {
   if (!options.https) {
     return app;
   }
@@ -42,37 +51,40 @@ function getServer(app, options) {
   }
 
   const sslOptions = {
-    ca: (options.sslCa || []).map(ca => fs.readFileSync(ca, 'utf-8')),
-    cert: fs.readFileSync(options.sslCert, 'utf-8'),
-    key: fs.readFileSync(options.sslKey, 'utf-8'),
+    ca: await Promise.all((options.sslCa || []).map(ca => fs.readFile(ca, 'utf-8'))),
+    cert: await fs.readFile(options.sslCert, 'utf-8'),
+    key: await fs.readFile(options.sslKey, 'utf-8'),
   };
 
   return https.createServer(sslOptions, app);
 }
 
-function applyStatic(app, options) {
+async function applyStatic(app, options) {
   const { staticDir } = options;
+
   let hasCustomFavicon = false;
 
-  if (staticDir) {
-    staticDir.forEach(dir => {
-      const staticPath = path.resolve(dir);
+  if (staticDir && staticDir.length) {
+    await Promise.all(
+      staticDir.map(async dir => {
+        const staticPath = path.resolve(dir);
 
-      if (!fs.existsSync(staticPath)) {
-        logger.error(`Error: no such directory to load static files: ${staticPath}`);
-        process.exit(-1);
-      }
+        if (await !fs.exists(staticPath)) {
+          logger.error(`Error: no such directory to load static files: ${staticPath}`);
+          process.exit(-1);
+        }
 
-      logger.info(`=> Loading static files from: ${staticPath} .`);
-      app.use(express.static(staticPath, { index: false }));
+        logger.info(`=> Loading static files from: ${staticPath} .`);
+        app.use(express.static(staticPath, { index: false }));
 
-      const faviconPath = path.resolve(staticPath, 'favicon.ico');
+        const faviconPath = path.resolve(staticPath, 'favicon.ico');
 
-      if (fs.existsSync(faviconPath)) {
-        hasCustomFavicon = true;
-        app.use(favicon(faviconPath));
-      }
-    });
+        if (await fs.exists(faviconPath)) {
+          hasCustomFavicon = true;
+          app.use(favicon(faviconPath));
+        }
+      })
+    );
   }
 
   if (!hasCustomFavicon) {
@@ -137,9 +149,9 @@ export async function buildDevStandalone(options) {
     }
 
     const app = express();
-    const server = getServer(app, options);
+    const server = await getServer(app, options);
 
-    applyStatic(app, options);
+    await applyStatic(app, options);
 
     const storybookMiddleware = await storybook(options);
 
@@ -148,7 +160,7 @@ export async function buildDevStandalone(options) {
     const serverListening = listenToServer(server, listenAddr);
 
     const [
-      { iframeStats, managerStats, managerTotalTime, iframeTotalTime },
+      { previewStats, managerStats, managerTotalTime, previewTotalTime },
       updateInfo,
     ] = await Promise.all([
       webpackValid,
@@ -214,7 +226,7 @@ export async function buildDevStandalone(options) {
           ${colors.green(`Storybook ${chalk.bold(options.packageJson.version)} started`)}
           ${chalk.gray(stripIndents`
           ${chalk.underline(prettyTime(managerTotalTime))} for manager and ${chalk.underline(
-            prettyTime(iframeTotalTime)
+            prettyTime(previewTotalTime)
           )} for preview`)}
 
           ${serveMessage.toString()}${updateMessage ? `\n\n${updateMessage}` : ''}
@@ -224,7 +236,11 @@ export async function buildDevStandalone(options) {
     );
 
     if (options.smokeTest) {
-      process.exit(iframeStats.toJson().warnings.length ? 1 : 0);
+      await writeStats('preview', previewStats);
+      await writeStats('manager', managerStats);
+      logger.info(`stats written to => ${chalk.cyan(path.join(cacheDir, '[name].json'))}`);
+
+      process.exit(previewStats.toJson().warnings.length ? 1 : 0);
       process.exit(managerStats.toJson().warnings.length ? 1 : 0);
     } else if (!options.ci) {
       opn(address).catch(() => {
diff --git a/lib/core/src/server/build-static.js b/lib/core/src/server/build-static.js
index 03a7e33bcbca..d89080b58972 100644
--- a/lib/core/src/server/build-static.js
+++ b/lib/core/src/server/build-static.js
@@ -1,4 +1,4 @@
-import fs from 'fs';
+import fs from 'fs-extra';
 import path from 'path';
 import webpack from 'webpack';
 import shelljs from 'shelljs';
@@ -9,23 +9,50 @@ import { getProdCli } from './cli';
 import loadConfig from './config';
 import loadManagerConfig from './manager/manager-config';
 
-const defaultFavIcon = require.resolve('./public/favicon.ico');
-
 export async function buildStaticStandalone(options) {
-  const { staticDir, watch, configDir, packageJson } = options;
+  const { staticDir, configDir, packageJson, watch } = options;
 
   const configType = 'PRODUCTION';
   const outputDir = path.join(process.cwd(), options.outputDir);
+  const dllPath = path.join(__dirname, '../../dll/*');
+  const defaultFavIcon = require.resolve('./public/favicon.ico');
 
   // create output directory if not exists
   shelljs.mkdir('-p', outputDir);
+  shelljs.mkdir('-p', path.join(outputDir, 'sb_dll'));
+
   // clear the static dir
   shelljs.rm('-rf', path.join(outputDir, 'static'));
   shelljs.cp(defaultFavIcon, outputDir);
 
-  logger.info('building manager..');
+  logger.info('clean outputDir..');
+  shelljs.rm('-rf', path.join(outputDir, 'static'));
+
+  shelljs.cp(defaultFavIcon, outputDir);
+
+  // copy all static files
+  if (staticDir && staticDir.length) {
+    await Promise.all(
+      staticDir.map(async dir => {
+        const staticPath = path.resolve(dir);
+
+        if (await !fs.exists(staticPath)) {
+          logger.error(`Error: no such directory to load static files: ${staticPath}`);
+          process.exit(-1);
+        }
+        shelljs.cp('-r', `${dir}/!(index.html)`, outputDir);
+      })
+    );
+    logger.info(`=> Copying static files from: ${staticDir.join(', ')}`);
+  }
+
+  logger.info(`=> Copying prebuild dll's..`);
+  shelljs.cp('-r', dllPath, path.join(outputDir, 'sb_dll'));
+
+  logger.info('=> Building manager..');
   const managerStartTime = process.hrtime();
 
+  logger.info('=> Loading manager config..');
   const managerConfig = await loadManagerConfig({
     configType,
     outputDir,
@@ -33,25 +60,40 @@ export async function buildStaticStandalone(options) {
     corePresets: [require.resolve('./manager/manager-preset.js')],
   });
 
-  await new Promise((res, rej) => {
-    webpack(managerConfig).run((err, stats) => {
-      const managerTotalTime = process.hrtime(managerStartTime);
-      logger.trace({ message: 'manager built', time: managerTotalTime });
-
-      if (err) {
-        rej(err);
-      } else if (stats.hasErrors()) {
-        rej(stats);
-      } else {
-        res(stats);
+  logger.info('=> Compiling manager..');
+  await new Promise((resolve, reject) => {
+    webpack(managerConfig).run((error, stats) => {
+      if (error || !stats || stats.hasErrors()) {
+        logger.error('=> Failed to build the manager');
+
+        if (error) {
+          logger.error(error.message);
+        }
+
+        if (stats && (stats.hasErrors() || stats.hasWarnings())) {
+          const { warnings, errors } = stats.toJson();
+
+          errors.forEach(e => logger.error(e));
+          warnings.forEach(e => logger.error(e));
+        }
+
+        process.exitCode = 1;
+        reject(error || stats);
+        return;
       }
+
+      logger.trace({ message: '=> manager built', time: process.hrtime(managerStartTime) });
+      stats.toJson().warnings.forEach(e => logger.warn(e));
+
+      resolve(stats);
     });
   });
 
-  // Build the webpack configuration using the `baseConfig`
-  // custom `.babelrc` file and `webpack.config.js` files
-  // NOTE changes to env should be done before calling `getBaseConfig`
-  const config = await loadConfig({
+  logger.info('=> Building preview..');
+  const previewStartTime = process.hrtime();
+
+  logger.info('=> Loading preview config..');
+  const previewConfig = await loadConfig({
     configType,
     outputDir,
     packageJson,
@@ -60,56 +102,60 @@ export async function buildStaticStandalone(options) {
     ...options,
   });
 
-  // config.output.path = path.resolve(outputDir);
-
-  // copy all static files
-  if (staticDir) {
-    staticDir.forEach(dir => {
-      if (!fs.existsSync(dir)) {
-        logger.error(`Error: no such directory to load static files: ${dir}`);
-        process.exit(-1);
-      }
-      logger.info(`=> Copying static files from: ${dir}`);
-      shelljs.cp('-r', `${dir}/!(index.html)`, outputDir);
+  if (watch) {
+    logger.info('=> Compiling preview in watch mode..');
+    await new Promise(() => {
+      webpack(previewConfig).watch(
+        {
+          aggregateTimeout: 1,
+        },
+        (error, stats) => {
+          if (!error) {
+            // eslint-disable-next-line no-console
+            console.log(stats.toString({ colors: true }));
+          } else {
+            logger.error(error.message);
+          }
+        }
+      );
+    });
+  } else {
+    logger.info('=> Compiling preview..');
+    await new Promise((resolve, reject) => {
+      webpack(previewConfig).run((error, stats) => {
+        if (error || !stats || stats.hasErrors()) {
+          logger.error('=> Failed to build the preview');
+          process.exitCode = 1;
+
+          if (error) {
+            logger.error(error.message);
+            return reject(error);
+          }
+
+          if (stats && (stats.hasErrors() || stats.hasWarnings())) {
+            const { warnings, errors } = stats.toJson();
+
+            errors.forEach(e => logger.error(e));
+            warnings.forEach(e => logger.error(e));
+            return reject(stats);
+          }
+        }
+
+        logger.trace({ message: '=> Preview built', time: process.hrtime(previewStartTime) });
+        stats.toJson().warnings.forEach(e => logger.warn(e));
+
+        return resolve(stats);
+      });
     });
   }
 
-  // compile all resources with webpack and write them to the disk.
-  return new Promise((resolve, reject) => {
-    const previewStartTime = process.hrtime();
-
-    const webpackCb = (err, stats) => {
-      if (err || stats.hasErrors()) {
-        logger.error('Failed to build the storybook');
-        // eslint-disable-next-line no-unused-expressions
-        err && logger.error(err.message);
-        // eslint-disable-next-line no-unused-expressions
-        stats && stats.hasErrors() && stats.toJson().errors.forEach(e => logger.error(e));
-        process.exitCode = 1;
-        return reject(err);
-      }
-
-      const previewTotalTime = process.hrtime(previewStartTime);
-      logger.trace({ message: 'preview built', time: previewTotalTime });
-
-      return resolve(stats);
-    };
-
-    logger.info('building preview..');
-    const compiler = webpack(config);
-
-    if (watch) {
-      compiler.watch({}, webpackCb);
-    } else {
-      compiler.run(webpackCb);
-    }
-  });
+  logger.info(`=> Output directory: ${outputDir}`);
 }
 
-export async function buildStatic({ packageJson, ...loadOptions }) {
+export function buildStatic({ packageJson, ...loadOptions }) {
   const cliOptions = getProdCli(packageJson);
 
-  await buildStaticStandalone({
+  return buildStaticStandalone({
     ...cliOptions,
     ...loadOptions,
     packageJson,
diff --git a/lib/core/src/server/dev-server.js b/lib/core/src/server/dev-server.js
index 10766dfb4ebc..7fd664eded1c 100644
--- a/lib/core/src/server/dev-server.js
+++ b/lib/core/src/server/dev-server.js
@@ -13,52 +13,59 @@ import loadManagerConfig from './manager/manager-config';
 let webpackResolve = () => {};
 let webpackReject = () => {};
 
+const dllPath = path.join(__dirname, '../../dll');
+
 export const webpackValid = new Promise((resolve, reject) => {
   webpackResolve = resolve;
   webpackReject = reject;
 });
 
+const cache = {};
+
 export default async function(options) {
   const configDir = path.resolve(options.configDir);
   const outputDir = path.resolve(options.outputDir || path.join(__dirname, '..', 'public'));
   const configType = 'DEVELOPMENT';
 
-  const managerStartTime = process.hrtime();
+  const startTime = process.hrtime();
   let managerTotalTime;
+  let previewTotalTime;
 
-  const managerConfig = await loadManagerConfig({
+  const managerPromise = loadManagerConfig({
     configType,
     outputDir,
     configDir,
+    cache,
     corePresets: [require.resolve('./manager/manager-preset.js')],
-  });
+  }).then(
+    config =>
+      new Promise((resolve, reject) => {
+        webpack(config).watch(
+          {
+            aggregateTimeout: 1,
+            ignored: /node_modules/,
+          },
+          (err, stats) => {
+            managerTotalTime = process.hrtime(startTime);
+            if (err || stats.hasErrors()) {
+              reject(stats);
+            } else {
+              resolve(stats);
+            }
+          }
+        );
+      })
+  );
 
   const iframeConfig = await loadConfig({
     configType,
     outputDir,
+    cache,
     corePresets: [require.resolve('./preview/preview-preset.js')],
     overridePresets: [require.resolve('./preview/custom-webpack-preset.js')],
     ...options,
   });
 
-  const managerPromise = new Promise((res, rej) => {
-    webpack(managerConfig).watch(
-      {
-        aggregateTimeout: 1,
-        ignored: /node_modules/,
-      },
-      (err, stats) => {
-        managerTotalTime = process.hrtime(managerStartTime);
-
-        if (err || stats.hasErrors()) {
-          rej(stats);
-        } else {
-          res(stats);
-        }
-      }
-    );
-  });
-
   const middlewareFn = getMiddleware(configDir);
 
   // remove the leading '/'
@@ -67,8 +74,6 @@ export default async function(options) {
     publicPath = publicPath.slice(1);
   }
 
-  const iframeStartTime = process.hrtime();
-  let iframeTotalTime;
   const iframeCompiler = webpack(iframeConfig);
   const devMiddlewareOptions = {
     publicPath: iframeConfig.output.publicPath,
@@ -92,30 +97,40 @@ export default async function(options) {
   // custom middleware
   middlewareFn(router);
 
-  const iframePromise = new Promise((res, rej) => {
+  const previewPromise = new Promise((resolve, reject) => {
     webpackDevMiddlewareInstance.waitUntilValid(stats => {
-      iframeTotalTime = process.hrtime(iframeStartTime);
+      previewTotalTime = process.hrtime(startTime);
 
-      if (stats.hasErrors()) {
-        rej(stats);
+      if (!stats) {
+        reject(new Error('no stats after building iframe'));
+      } else if (stats.hasErrors()) {
+        reject(stats);
       } else {
-        res(stats);
+        resolve(stats);
       }
     });
   });
 
-  Promise.all([managerPromise, iframePromise])
-    .then(([managerStats, iframeStats]) => {
+  Promise.all([managerPromise, previewPromise])
+    .then(([managerStats, previewStats]) => {
       router.get('/', (request, response) => {
         response.set('Content-Type', 'text/html');
         response.sendFile(path.join(`${outputDir}/index.html`));
       });
+      router.get(/\/sb_dll\/(.+\.js)$/, (request, response) => {
+        response.set('Content-Type', 'text/javascript');
+        response.sendFile(path.join(`${dllPath}/${request.params[0]}`));
+      });
+      router.get(/\/sb_dll\/(.+\.LICENCE)$/, (request, response) => {
+        response.set('Content-Type', 'text/html');
+        response.sendFile(path.join(`${dllPath}/${request.params[0]}`));
+      });
       router.get(/(.+\.js)$/, (request, response) => {
-        response.set('Content-Type', 'text/javascript	');
+        response.set('Content-Type', 'text/javascript');
         response.sendFile(path.join(`${outputDir}/${request.params[0]}`));
       });
 
-      webpackResolve({ iframeStats, managerStats, managerTotalTime, iframeTotalTime });
+      webpackResolve({ previewStats, managerStats, managerTotalTime, previewTotalTime });
     })
     .catch(e => webpackReject(e));
 
diff --git a/lib/core/src/server/manager/manager-preset.js b/lib/core/src/server/manager/manager-preset.js
index 91956f8b1531..51123ec73b9d 100644
--- a/lib/core/src/server/manager/manager-preset.js
+++ b/lib/core/src/server/manager/manager-preset.js
@@ -7,7 +7,7 @@ export async function managerWebpack(_, options) {
 
 export async function managerEntries(_, options) {
   const { presets } = options;
-  const entries = [require.resolve('../common/polyfills')];
+  const entries = [];
 
   const installedAddons = await presets.apply('addons', [], options);
 
diff --git a/lib/core/src/server/manager/manager-webpack.config.js b/lib/core/src/server/manager/manager-webpack.config.js
index a40366842338..d70913b2b01b 100644
--- a/lib/core/src/server/manager/manager-webpack.config.js
+++ b/lib/core/src/server/manager/manager-webpack.config.js
@@ -1,22 +1,27 @@
+import path from 'path';
 import webpack from 'webpack';
 import Dotenv from 'dotenv-webpack';
 import HtmlWebpackPlugin from 'html-webpack-plugin';
-import HtmlWebpackHarddiskPlugin from '@ndelangen/html-webpack-harddisk-plugin';
 import CaseSensitivePathsPlugin from 'case-sensitive-paths-webpack-plugin';
 
+import findCacheDir from 'find-cache-dir';
+
 import { version } from '../../../package.json';
 import { getManagerHeadHtml } from '../utils/template';
 import { loadEnv, getBabelRuntimePath } from '../config/utils';
 
-export default ({ configDir, entries, outputDir }) => {
-  const { raw, stringified } = loadEnv();
+const coreDirName = path.dirname(require.resolve('@storybook/core/package.json'));
+const context = path.join(coreDirName, '../../node_modules');
+const cacheDir = findCacheDir({ name: 'storybook' });
 
-  const exclude = /node_modules/;
+export default ({ configDir, configType, entries, outputDir, cache }) => {
+  const { raw, stringified } = loadEnv();
+  const isProd = configType === 'PRODUCTION';
 
   return {
     name: 'manager',
-    mode: 'production',
-    bail: true,
+    mode: isProd ? 'production' : 'development',
+    bail: isProd,
     devtool: 'none',
     entry: entries,
     output: {
@@ -24,7 +29,12 @@ export default ({ configDir, entries, outputDir }) => {
       filename: '[name].[chunkhash].bundle.js',
       publicPath: '',
     },
+    cache,
     plugins: [
+      new webpack.DllReferencePlugin({
+        context,
+        manifest: path.join(__dirname, '../../../dll/storybook_ui-manifest.json'),
+      }),
       new HtmlWebpackPlugin({
         filename: `index.html`,
         chunksSortMode: 'none',
@@ -35,36 +45,15 @@ export default ({ configDir, entries, outputDir }) => {
           files,
           options,
           version,
+          dlls: ['/sb_dll/storybook_ui_dll.js'],
           headHtmlSnippet: getManagerHeadHtml(configDir, process.env),
         }),
         template: require.resolve(`../templates/index.ejs`),
       }),
-      new HtmlWebpackHarddiskPlugin(),
       new webpack.DefinePlugin({ 'process.env': stringified }),
       new CaseSensitivePathsPlugin(),
       new Dotenv({ silent: true }),
     ],
-    module: {
-      rules: [
-        {
-          test: /\.jsx?$/,
-          use: [
-            {
-              loader: 'babel-loader',
-            },
-          ],
-          exclude,
-        },
-        {
-          test: /\.md$/,
-          use: [
-            {
-              loader: require.resolve('raw-loader'),
-            },
-          ],
-        },
-      ],
-    },
     resolve: {
       extensions: ['.mjs', '.js', '.jsx', '.json'],
       modules: ['node_modules'].concat(raw.NODE_PATH || []),
@@ -74,6 +63,7 @@ export default ({ configDir, entries, outputDir }) => {
         'react-dom': require.resolve('react-dom'),
       },
     },
+    recordsPath: path.join(cacheDir, 'records.json'),
     optimization: {
       splitChunks: {
         chunks: 'all',
diff --git a/lib/core/src/server/preview/iframe-webpack.config.js b/lib/core/src/server/preview/iframe-webpack.config.js
index 56d154b4341b..30ae9cc9cec8 100644
--- a/lib/core/src/server/preview/iframe-webpack.config.js
+++ b/lib/core/src/server/preview/iframe-webpack.config.js
@@ -49,6 +49,7 @@ export default ({
           options,
           version: packageJson.version,
           headHtmlSnippet: getPreviewHeadHtml(configDir, process.env),
+          dlls: [],
           bodyHtmlSnippet: getPreviewBodyHtml(),
         }),
         template: require.resolve(`../templates/index.ejs`),
diff --git a/lib/core/src/server/templates/index.ejs b/lib/core/src/server/templates/index.ejs
index cb0822c14f90..11870aa616f2 100644
--- a/lib/core/src/server/templates/index.ejs
+++ b/lib/core/src/server/templates/index.ejs
@@ -38,6 +38,10 @@
 </script>
 <% } %>
 
+<% dlls.forEach(file => { %>
+  <script src="<%= file %>"></script>
+<% }); %>
+
 <% files.js.forEach(file => { %>
   <script src="<%= file %>"></script>
 <% }); %>
diff --git a/lib/ui/package.json b/lib/ui/package.json
index 29af613ae4dc..897cd0c65268 100644
--- a/lib/ui/package.json
+++ b/lib/ui/package.json
@@ -6,9 +6,6 @@
     "storybook"
   ],
   "homepage": "https://github.com/storybooks/storybook/tree/master/lib/ui",
-  "publishConfig": {
-    "access": "public"
-  },
   "bugs": {
     "url": "https://github.com/storybooks/storybook/issues"
   },
@@ -20,9 +17,8 @@
   "main": "dist/index.js",
   "jsnext:main": "src/index.js",
   "scripts": {
-    "prepare": "node ../../scripts/prepare.js",
-    "publish-storybook": "bash ./.scripts/publish_storybook.sh",
-    "storybook": "start-storybook -p 9010"
+    "createDlls": "node -r esm ./scripts/createDlls.js",
+    "prepare": "node ../../scripts/prepare.js"
   },
   "dependencies": {
     "@emotion/core": "^0.13.1",
@@ -34,7 +30,7 @@
     "@storybook/podda": "^1.2.3",
     "@storybook/react-komposer": "^2.0.5",
     "deep-equal": "^1.0.1",
-    "events": "^3.0.0",
+    "eventemitter3": "^3.1.0",
     "fuse.js": "^3.3.0",
     "global": "^4.3.2",
     "keycode": "^2.2.0",
@@ -47,11 +43,14 @@
     "react-treebeard": "^3.1.0"
   },
   "devDependencies": {
-    "@storybook/addon-actions": "4.1.0-alpha.9",
-    "@storybook/react": "4.1.0-alpha.9"
+    "webpack": "^4.23.1",
+    "terser-webpack-plugin": "^1.1.0"
   },
   "peerDependencies": {
     "react": "*",
     "react-dom": "*"
+  },
+  "publishConfig": {
+    "access": "public"
   }
 }
diff --git a/lib/ui/scripts/createDlls.js b/lib/ui/scripts/createDlls.js
new file mode 100644
index 000000000000..427b4c0870ba
--- /dev/null
+++ b/lib/ui/scripts/createDlls.js
@@ -0,0 +1,52 @@
+import path from 'path';
+import webpack from 'webpack';
+
+import config from './webpackDllsConfig';
+
+const resolveLocal = dir => path.join(__dirname, dir);
+const webpackAsPromised = c =>
+  new Promise((res, rej) => {
+    webpack(c).run((err, stats) => {
+      if (err || stats.hasErrors() || stats.hasWarnings()) {
+        rej(stats);
+        return;
+      }
+      res(stats);
+    });
+  });
+
+const run = () =>
+  webpackAsPromised(
+    config({
+      entry: {
+        storybook_ui: [
+          'core-js/fn/array/iterator',
+          'airbnb-js-shims',
+          'core-js/es6/symbol',
+          'react',
+          'prop-types',
+          'react-dom',
+          '@storybook/components',
+          '@storybook/addons',
+          '@storybook/core-events',
+          '@emotion/styled',
+          '@emotion/provider',
+          '@emotion/core',
+          resolveLocal('../dist/index.js'),
+        ],
+      },
+    })
+  );
+
+run().then(
+  s => {
+    // eslint-disable-next-line no-console
+    console.log('success: ', s.toString());
+    process.exitCode = 0;
+  },
+  s => {
+    // eslint-disable-next-line no-console
+    console.error('failed: ', s.toString());
+    process.exitCode = 1;
+  }
+);
diff --git a/lib/ui/scripts/webpackDllsConfig.js b/lib/ui/scripts/webpackDllsConfig.js
new file mode 100644
index 000000000000..1e472c18b0d6
--- /dev/null
+++ b/lib/ui/scripts/webpackDllsConfig.js
@@ -0,0 +1,52 @@
+import path from 'path';
+import webpack from 'webpack';
+import TerserPlugin from 'terser-webpack-plugin';
+
+const resolveLocal = dir => path.join(__dirname, dir);
+
+const r = resolveLocal('../../../node_modules');
+const out = resolveLocal('../../core/dll');
+
+export default ({ entry, provided = [] }) => ({
+  name: 'storybook-ui',
+  mode: 'production',
+
+  entry,
+  output: {
+    path: out,
+    filename: '[name]_dll.js',
+    library: '[name]_dll',
+  },
+  externals: provided,
+
+  resolve: {
+    extensions: ['.mjs', '.js', '.jsx', '.json'],
+    modules: [path.join(__dirname, '../../../node_modules')],
+  },
+
+  plugins: [
+    new webpack.ProgressPlugin(),
+    new webpack.DllPlugin({
+      context: r,
+      path: `${out}/[name]-manifest.json`,
+      name: '[name]_dll',
+    }),
+  ],
+  optimization: {
+    concatenateModules: true,
+    portableRecords: true,
+    moduleIds: 'hashed',
+    minimizer: [
+      new TerserPlugin({
+        extractComments: {
+          condition: /^\**!|@preserve|@license|@cc_on/i,
+          filename: file => file.replace('.js', '.LICENCE'),
+          banner: licenseFile => `License information can be found in ${licenseFile}`,
+        },
+      }),
+    ],
+  },
+  performance: {
+    hints: false,
+  },
+});
diff --git a/lib/ui/src/modules/api/configs/init_api.js b/lib/ui/src/modules/api/configs/init_api.js
index 8e00ce5d0732..ddbb680c2cb2 100644
--- a/lib/ui/src/modules/api/configs/init_api.js
+++ b/lib/ui/src/modules/api/configs/init_api.js
@@ -1,4 +1,4 @@
-import { EventEmitter } from 'events';
+import EventEmitter from 'eventemitter3';
 import { getUrlState } from '../../ui/configs/handle_routing';
 
 export default function(provider, clientStore, actions) {
diff --git a/lib/ui/src/modules/ui/components/menu_item.stories.js b/lib/ui/src/modules/ui/components/menu_item.stories.js
index 23971b87c18f..1849a614bb64 100644
--- a/lib/ui/src/modules/ui/components/menu_item.stories.js
+++ b/lib/ui/src/modules/ui/components/menu_item.stories.js
@@ -1,6 +1,6 @@
 import React from 'react';
-import { storiesOf } from '@storybook/react';
-import { action } from '@storybook/addon-actions';
+import { storiesOf } from '@storybook/react'; // eslint-disable-line import/no-extraneous-dependencies
+import { action } from '@storybook/addon-actions'; // eslint-disable-line import/no-extraneous-dependencies
 
 import MenuItem from './menu_item';
 
diff --git a/lib/ui/src/modules/ui/components/search_box.stories.js b/lib/ui/src/modules/ui/components/search_box.stories.js
index 2d2d90819e71..98b746e0ad30 100644
--- a/lib/ui/src/modules/ui/components/search_box.stories.js
+++ b/lib/ui/src/modules/ui/components/search_box.stories.js
@@ -1,7 +1,7 @@
 import React from 'react';
 import ReactModal from 'react-modal';
-import { storiesOf } from '@storybook/react';
-import { action } from '@storybook/addon-actions';
+import { storiesOf } from '@storybook/react'; // eslint-disable-line import/no-extraneous-dependencies
+import { action } from '@storybook/addon-actions'; // eslint-disable-line import/no-extraneous-dependencies
 import { document, navigator } from 'global';
 
 import Component from './search_box';
diff --git a/lib/ui/src/modules/ui/components/shortcuts_help.stories.js b/lib/ui/src/modules/ui/components/shortcuts_help.stories.js
index 804b7481b9db..008cbede4c6d 100644
--- a/lib/ui/src/modules/ui/components/shortcuts_help.stories.js
+++ b/lib/ui/src/modules/ui/components/shortcuts_help.stories.js
@@ -1,7 +1,7 @@
 import React from 'react';
 import ReactModal from 'react-modal';
-import { storiesOf } from '@storybook/react';
-import { action } from '@storybook/addon-actions';
+import { storiesOf } from '@storybook/react'; // eslint-disable-line import/no-extraneous-dependencies
+import { action } from '@storybook/addon-actions'; // eslint-disable-line import/no-extraneous-dependencies
 import { document, navigator } from 'global';
 
 import ShortcutsHelp from './shortcuts_help';
diff --git a/lib/ui/src/modules/ui/components/stories_panel/index.stories.js b/lib/ui/src/modules/ui/components/stories_panel/index.stories.js
index d7f6aa967c09..ba212e127358 100644
--- a/lib/ui/src/modules/ui/components/stories_panel/index.stories.js
+++ b/lib/ui/src/modules/ui/components/stories_panel/index.stories.js
@@ -1,6 +1,6 @@
 import React from 'react';
-import { storiesOf } from '@storybook/react';
-import { action } from '@storybook/addon-actions';
+import { storiesOf } from '@storybook/react'; // eslint-disable-line import/no-extraneous-dependencies
+import { action } from '@storybook/addon-actions'; // eslint-disable-line import/no-extraneous-dependencies
 
 import StoriesPanel from './index';
 import { createHierarchies } from '../../libs/hierarchy';
diff --git a/lib/ui/src/modules/ui/components/stories_panel/stories_tree/index.stories.js b/lib/ui/src/modules/ui/components/stories_panel/stories_tree/index.stories.js
index 91ce0bc7f4f0..7438df3a6466 100644
--- a/lib/ui/src/modules/ui/components/stories_panel/stories_tree/index.stories.js
+++ b/lib/ui/src/modules/ui/components/stories_panel/stories_tree/index.stories.js
@@ -1,5 +1,5 @@
 import React from 'react';
-import { storiesOf } from '@storybook/react';
+import { storiesOf } from '@storybook/react'; // eslint-disable-line import/no-extraneous-dependencies
 
 import Stories from './index';
 import { setContext } from '../../../../../compose';
diff --git a/lib/ui/src/modules/ui/components/stories_panel/text_filter.stories.js b/lib/ui/src/modules/ui/components/stories_panel/text_filter.stories.js
index fe41c7940438..a5489fe26a5f 100644
--- a/lib/ui/src/modules/ui/components/stories_panel/text_filter.stories.js
+++ b/lib/ui/src/modules/ui/components/stories_panel/text_filter.stories.js
@@ -1,6 +1,6 @@
 import React from 'react';
-import { storiesOf } from '@storybook/react';
-import { action } from '@storybook/addon-actions';
+import { storiesOf } from '@storybook/react'; // eslint-disable-line import/no-extraneous-dependencies
+import { action } from '@storybook/addon-actions'; // eslint-disable-line import/no-extraneous-dependencies
 
 import TextFilter from './text_filter';
 
diff --git a/package.json b/package.json
index d905acdbd615..d19dc9d83e7e 100644
--- a/package.json
+++ b/package.json
@@ -65,10 +65,10 @@
     "babel-eslint": "^10.0.1",
     "babel-jest": "^23.6.0",
     "babel-loader": "^8.0.4",
+    "babel-plugin-dynamic-import-node": "^2.2.0",
     "babel-plugin-emotion": "^9.2.11",
     "babel-plugin-macros": "^2.4.2",
     "babel-plugin-require-context-hook": "^1.0.0",
-    "babel-plugin-dynamic-import-node": "^2.2.0",
     "babel-preset-vue": "^2.0.2",
     "chalk": "^2.4.1",
     "codecov": "^3.1.0",
@@ -89,6 +89,7 @@
     "eslint-plugin-prettier": "^3.0.0",
     "eslint-plugin-react": "^7.10.0",
     "eslint-teamcity": "^2.1.0",
+    "esm": "^3.0.84",
     "github-release-from-changelog": "^1.3.2",
     "glob": "^7.1.3",
     "husky": "^1.1.1",
@@ -121,7 +122,8 @@
     "tslint": "~5.11.0",
     "tslint-config-prettier": "^1.15.0",
     "tslint-plugin-prettier": "^2.0.1",
-    "typescript": "^3.1.6"
+    "typescript": "^3.1.6",
+    "uglifyjs-webpack-plugin": "^2.0.1"
   },
   "husky": {
     "hooks": {
diff --git a/scripts/bootstrap.js b/scripts/bootstrap.js
index 0f40276abbc8..b968eff9def3 100755
--- a/scripts/bootstrap.js
+++ b/scripts/bootstrap.js
@@ -73,7 +73,7 @@ const tasks = {
     },
   }),
   core: createTask({
-    name: `Core & Examples ${chalk.gray('(core)')}`,
+    name: `Core, Dll & Examples ${chalk.gray('(core)')}`,
     defaultValue: true,
     option: '--core',
     command: () => {
@@ -81,6 +81,17 @@ const tasks = {
       spawn('yarn install');
       log.info(prefix, 'prepare');
       spawn('lerna run prepare -- --silent');
+      log.info(prefix, 'dll');
+      spawn('lerna run createDlls --scope "@storybook/ui"');
+    },
+  }),
+  dll: createTask({
+    name: `Generate DLL ${chalk.gray('(dll)')}`,
+    defaultValue: false,
+    option: '--dll',
+    command: () => {
+      log.info(prefix, 'dll');
+      spawn('lerna run createDlls --scope "@storybook/ui"');
     },
   }),
   docs: createTask({
diff --git a/scripts/compile-js.js b/scripts/compile-js.js
index 78230420170b..1ebba2962c76 100644
--- a/scripts/compile-js.js
+++ b/scripts/compile-js.js
@@ -10,7 +10,7 @@ function getCommand(watch) {
     '--ignore **/__mocks__/,**/tests/*,**/__tests__/,**/**.test.js,**/stories/,**/**.story.js,**/**.stories.js,**/__snapshots__',
     './src --out-dir ./dist',
     '--copy-files',
-    `--config-file ${path.resolve(__dirname, '../.babelrc')}`,
+    `--config-file ${path.resolve(__dirname, '../.babelrc.js')}`,
   ];
 
   if (watch) {
diff --git a/yarn.lock b/yarn.lock
index 225b61f3ec9f..e1f843a2e74a 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1959,13 +1959,6 @@
     call-me-maybe "^1.0.1"
     glob-to-regexp "^0.3.0"
 
-"@ndelangen/html-webpack-harddisk-plugin@^0.2.0":
-  version "0.2.0"
-  resolved "https://registry.yarnpkg.com/@ndelangen/html-webpack-harddisk-plugin/-/html-webpack-harddisk-plugin-0.2.0.tgz#d2eb570597c83c1aa93d1f2fcb3d874a5855de07"
-  integrity sha512-55Mo2b5WtIT0l653y6ocu7C6QzznbasEnlixGzA26WK8Fj81wuEY3xf5N5bNAvDVfrwTLIPTXdEUGgPdrPLszw==
-  dependencies:
-    mkdirp "^0.5.1"
-
 "@ngrx/store@^6.1.2":
   version "6.1.2"
   resolved "https://registry.yarnpkg.com/@ngrx/store/-/store-6.1.2.tgz#20fb5ab4d79571b804a348093aa11a167fe2946f"
@@ -5967,6 +5960,26 @@ cacache@^11.0.1, cacache@^11.0.2:
     unique-filename "^1.1.0"
     y18n "^4.0.0"
 
+cacache@^11.2.0:
+  version "11.3.1"
+  resolved "https://registry.yarnpkg.com/cacache/-/cacache-11.3.1.tgz#d09d25f6c4aca7a6d305d141ae332613aa1d515f"
+  integrity sha512-2PEw4cRRDu+iQvBTTuttQifacYjLPhET+SYO/gEFMy8uhi+jlJREDAjSF5FWSdV/Aw5h18caHA7vMTw2c+wDzA==
+  dependencies:
+    bluebird "^3.5.1"
+    chownr "^1.0.1"
+    figgy-pudding "^3.1.0"
+    glob "^7.1.2"
+    graceful-fs "^4.1.11"
+    lru-cache "^4.1.3"
+    mississippi "^3.0.0"
+    mkdirp "^0.5.1"
+    move-concurrently "^1.0.1"
+    promise-inflight "^1.0.1"
+    rimraf "^2.6.2"
+    ssri "^6.0.0"
+    unique-filename "^1.1.0"
+    y18n "^4.0.0"
+
 cache-base@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/cache-base/-/cache-base-1.0.1.tgz#0a7f46416831c8b662ee36fe4e7c59d76f666ab2"
@@ -9325,6 +9338,11 @@ eslint@^5.8.0:
     table "^5.0.2"
     text-table "^0.2.0"
 
+esm@^3.0.84:
+  version "3.0.84"
+  resolved "https://registry.yarnpkg.com/esm/-/esm-3.0.84.tgz#bb108989f4673b32d4f62406869c28eed3815a63"
+  integrity sha512-SzSGoZc17S7P+12R9cg21Bdb7eybX25RnIeRZ80xZs+VZ3kdQKzqTp2k4hZJjR7p9l0186TTXSgrxzlMDBktlw==
+
 espree@^3.4.3:
   version "3.5.4"
   resolved "https://registry.yarnpkg.com/espree/-/espree-3.5.4.tgz#b0f447187c8a8bed944b815a660bddf5deb5d1a7"
@@ -10397,6 +10415,15 @@ fs-extra@^5.0.0:
     jsonfile "^4.0.0"
     universalify "^0.1.0"
 
+fs-extra@^7.0.1:
+  version "7.0.1"
+  resolved "https://registry.yarnpkg.com/fs-extra/-/fs-extra-7.0.1.tgz#4f189c44aa123b895f722804f55ea23eadc348e9"
+  integrity sha512-YJDaCJZEnBmcbw13fvdAM9AwNOJwOzrE4pqMqBq5nFiEqXUqHwlK4B+3pUw6JNvfSPtX05xFHtYy/1ni01eGCw==
+  dependencies:
+    graceful-fs "^4.1.2"
+    jsonfile "^4.0.0"
+    universalify "^0.1.0"
+
 fs-minipass@^1.2.5:
   version "1.2.5"
   resolved "https://registry.yarnpkg.com/fs-minipass/-/fs-minipass-1.2.5.tgz#06c277218454ec288df77ada54a03b8702aacb9d"
@@ -22259,7 +22286,7 @@ uglify-es@^3.1.9, uglify-es@^3.3.4:
     commander "~2.13.0"
     source-map "~0.6.1"
 
-uglify-js@3.4.x, uglify-js@^3.1.4, uglify-js@^3.4.0:
+uglify-js@3.4.x, uglify-js@^3.0.0, uglify-js@^3.1.4, uglify-js@^3.4.0:
   version "3.4.9"
   resolved "https://registry.yarnpkg.com/uglify-js/-/uglify-js-3.4.9.tgz#af02f180c1207d76432e473ed24a28f4a782bae3"
   integrity sha512-8CJsbKOtEbnJsTyv6LE6m6ZKniqMiFWmm9sRbopbkGs3gMPPfd3Fh8iIA4Ykv5MgaTbqHr4BaoGLJLZNhsrW1Q==
@@ -22281,6 +22308,20 @@ uglifyjs-webpack-plugin@^1.2.4:
     webpack-sources "^1.1.0"
     worker-farm "^1.5.2"
 
+uglifyjs-webpack-plugin@^2.0.1:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/uglifyjs-webpack-plugin/-/uglifyjs-webpack-plugin-2.0.1.tgz#f346af53ed496ce72fef462517d417f62bec3010"
+  integrity sha512-1HhCHkOB6wRCcv7htcz1QRPVbWPEY074RP9vzt/X0LF4xXm9l4YGd0qja7z88abDixQlnVwBjXsTBs+Xsn/eeQ==
+  dependencies:
+    cacache "^11.2.0"
+    find-cache-dir "^2.0.0"
+    schema-utils "^1.0.0"
+    serialize-javascript "^1.4.0"
+    source-map "^0.6.1"
+    uglify-js "^3.0.0"
+    webpack-sources "^1.1.0"
+    worker-farm "^1.5.2"
+
 uid-number@0.0.6:
   version "0.0.6"
   resolved "https://registry.yarnpkg.com/uid-number/-/uid-number-0.0.6.tgz#0ea10e8035e8eb5b8e4449f06da1c730663baa81"