Preventing form defaults. Fixes #294.

Downgrade node-sass (fixes #319)

.babelrc

@@ -1,13 +0,0 @@
-{
-  "plugins": [
-    "transform-class-properties",
-    "transform-react-constant-elements",
-    "transform-react-remove-prop-types",
-    [
-      "transform-react-jsx",
-      {
-        "pragma": "h"
-      }
-    ]
-  ]
-}

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,36 @@
+---
+name: Bug report
+about: Something is not working as expected
+labels: 
+
+---
+
+**Before you start**
+Please take a look at the [FAQ](https://github.com/GoogleChromeLabs/squoosh/wiki/FAQ) as well as the already opened issues! If nothing fits your problem, go ahead and fill out the following template:
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Version:**
+ - OS w/ version: [e.g. iOS 12]
+ - Browser w/ version [e.g. Chrome 70]
+ - Node version: [e.g. 10.11.0]
+ - npm version: [e.g. 6.4.1]
+
+**Is your issue related to the quality of image compression?**
+Please attach original and output images (you can drag & drop to attach). 
+- Original image 
+- Output image from Squoosh
+
+**Additional context, screenshots, screencasts**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,18 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+labels: 
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Does other service/app have this feature?**
+Add any service you know/use that has this feature (We want to know for research)
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.travis.yml

@@ -1,5 +1,7 @@
 language: node_js
 node_js:
 - node
+- 10
+- 8
 cache: npm
 script: npm run build || npm run build # scss ts definitions need to be generated before an actual build

README.md

@@ -1,5 +1,34 @@
-# Squoosh!
+# [Squoosh]!
 
-Squoosh will be an image compression web app that allows you to dive into the
+[Squoosh] is an image compression web app that allows you to dive into the advanced options provided
-advanced options provided by various image compressors.
+by various image compressors.
 
+# Privacy
+
+Google Analytics is used to record the following:
+
+* [Basic visit data](https://support.google.com/analytics/answer/6004245?ref_topic=2919631).
+* Before and after image size once an image is downloaded. These values are rounded to the nearest
+  kilobyte.
+
+Image compression is handled locally; no additional data is sent to the server.
+
+# Building locally
+
+Clone the repo, and:
+
+```sh
+npm install
+npm run build
+```
+
+You'll get an error on first build because of [a stupid bug we haven't fixed
+yet](https://github.com/GoogleChromeLabs/squoosh/issues/251).
+
+You can run the development server with:
+
+```sh
+npm start
+```
+
+[Squoosh]: https://squoosh.app

_headers.ejs

@@ -0,0 +1,18 @@
+# Long-term cache by default.
+/*
+  Cache-Control: max-age=31536000
+
+# And here are the exceptions:
+/
+  Cache-Control: no-cache
+
+/serviceworker.js
+  Cache-Control: no-cache
+
+/manifest.json
+  Cache-Control: must-revalidate, max-age=3600
+
+# URLs in /assets do not include a hash and are mutable.
+# But it isn't a big deal if the user gets an old version.
+/assets/*
+  Cache-Control: must-revalidate, max-age=3600

codecs/README.md

@@ -11,6 +11,6 @@ $ npm install
 $ npm run build
 ```
 
-This will build two files: `<codec name>_<enc or dec>.js` and `<codec name>_<enc or dec>.wasm`. It will most likely be necessary to set [`Module["locateFile"]`](https://kripken.github.io/emscripten-site/docs/api_reference/module.html#affecting-execution) to sucessfully load the `.wasm` file. When the `.js` file is loaded, a global `<codec name>_<enc or dec>` is created with the same API as an [Emscripten `Module`](https://kripken.github.io/emscripten-site/docs/api_reference/module.html).
+This will build two files: `<codec name>_<enc or dec>.js` and `<codec name>_<enc or dec>.wasm`. It will most likely be necessary to set [`Module["locateFile"]`](https://kripken.github.io/emscripten-site/docs/api_reference/module.html#affecting-execution) to successfully load the `.wasm` file. When the `.js` file is loaded, a global `<codec name>_<enc or dec>` is created with the same API as an [Emscripten `Module`](https://kripken.github.io/emscripten-site/docs/api_reference/module.html).
 
 Each codec will document its API in its README.

config/asset-template-plugin.js

@@ -0,0 +1,47 @@
+const path = require('path');
+const fs = require('fs');
+const ejs = require('ejs');
+const AssetsPlugin = require('assets-webpack-plugin');
+
+module.exports = class AssetTemplatePlugin extends AssetsPlugin {
+  constructor(options) {
+    options = options || {};
+    if (!options.template) throw Error('AssetTemplatePlugin: template option is required.');
+    super({
+      useCompilerPath: true,
+      filename: options.filename,
+      processOutput: files => this._processOutput(files)
+    });
+    this._template = path.resolve(process.cwd(), options.template);
+    const ignore = options.ignore || /(manifest\.json|\.DS_Store)$/;
+    this._ignore = typeof ignore === 'function' ? ({ test: ignore }) : ignore;
+  }
+
+  _processOutput(files) {
+    const mapping = {
+      all: [],
+      byType: {},
+      entries: {}
+    };
+    for (const entryName in files) {
+      // non-entry-point-derived assets are collected under an empty string key
+      // since that's a bit awkward, we'll call them "assets"
+      const name = entryName === '' ? 'assets' : entryName;
+      const listing = files[entryName];
+      const entry = mapping.entries[name] = {
+        all: [],
+        byType: {}
+      };
+      for (let type in listing) {
+        const list = [].concat(listing[type]).filter(file => !this._ignore.test(file));
+        if (!list.length) continue;
+        mapping.all = mapping.all.concat(list);
+        mapping.byType[type] = (mapping.byType[type] || []).concat(list);
+        entry.all = entry.all.concat(list);
+        entry.byType[type] = (entry.byType[type] || []).concat(list);
+      }
+    }
+    mapping.files = mapping.all;
+    return ejs.render(fs.readFileSync(this._template, 'utf8'), mapping);
+  }
+};

global.d.ts

@@ -6,7 +6,8 @@ declare interface NodeModule {
 }
 
 declare interface Window {
-  STATE: any
+  STATE: any;
+  ga: typeof ga;
 }
 
 declare namespace JSX {

package.json

@@ -1,13 +1,13 @@
 {
   "private": true,
   "name": "squoosh",
-  "version": "0.1.0",
+  "version": "1.0.2",
   "license": "apache-2.0",
   "scripts": {
-    "start": "webpack serve --host 0.0.0.0 --hot",
+    "start": "webpack-dev-server --host 0.0.0.0 --hot",
     "build": "webpack -p",
-    "lint": "tslint -c tslint.json -t verbose 'src/**/*.{ts,tsx,js,jsx}'",
+    "lint": "tslint -c tslint.json  -p tsconfig.json -t verbose 'src/**/*.{ts,tsx,js,jsx}'",
-    "lintfix": "tslint -c tslint.json -t verbose --fix 'src/**/*.{ts,tsx,js,jsx}'"
+    "lintfix": "tslint -c tslint.json -p tsconfig.json -t verbose --fix 'src/**/*.{ts,tsx,js,jsx}'"
   },
   "husky": {
     "hooks": {
@@ -15,62 +15,55 @@
     }
   },
   "devDependencies": {
-    "@types/node": "^9.6.35",
+    "@types/node": "^10.12.6",
     "@types/pretty-bytes": "^5.1.0",
     "@types/webassembly-js-api": "0.0.1",
     "@webcomponents/custom-elements": "^1.2.1",
-    "babel-loader": "^7.1.5",
+    "@webpack-cli/serve": "^0.1.2",
-    "babel-plugin-jsx-pragmatic": "^1.0.2",
+    "assets-webpack-plugin": "^3.9.7",
-    "babel-plugin-syntax-dynamic-import": "^6.18.0",
-    "babel-plugin-transform-class-properties": "^6.24.1",
-    "babel-plugin-transform-decorators-legacy": "^1.3.5",
-    "babel-plugin-transform-object-rest-spread": "^6.26.0",
-    "babel-plugin-transform-react-constant-elements": "^6.23.0",
-    "babel-plugin-transform-react-jsx": "^6.24.1",
-    "babel-plugin-transform-react-remove-prop-types": "^0.4.19",
-    "babel-preset-env": "^1.7.0",
-    "babel-register": "^6.26.0",
     "classnames": "^2.2.6",
-    "clean-webpack-plugin": "^0.1.19",
+    "clean-webpack-plugin": "^1.0.0",
     "comlink": "^3.0.3",
-    "copy-webpack-plugin": "^4.5.3",
+    "copy-webpack-plugin": "^4.6.0",
     "critters-webpack-plugin": "^2.0.1",
-    "css-loader": "^0.28.11",
+    "css-loader": "^1.0.1",
+    "ejs": "^2.6.1",
     "exports-loader": "^0.7.0",
     "file-drop-element": "^0.0.9",
-    "file-loader": "^1.1.11",
+    "file-loader": "^2.0.0",
     "html-webpack-plugin": "^3.2.0",
-    "husky": "^1.1.2",
+    "husky": "^1.1.4",
     "idb-keyval": "^3.1.0",
     "if-env": "^1.0.4",
     "linkstate": "^1.1.1",
     "loader-utils": "^1.1.0",
-    "pointer-tracker": "^2.0.3",
-    "minimatch": "^3.0.4",
     "mini-css-extract-plugin": "^0.4.4",
-    "node-sass": "^4.9.4",
+    "minimatch": "^3.0.4",
-    "optimize-css-assets-webpack-plugin": "^4.0.3",
+    "node-sass": "^4.9.0",
+    "optimize-css-assets-webpack-plugin": "^5.0.1",
+    "pointer-tracker": "^2.0.3",
     "preact": "^8.3.1",
     "prerender-loader": "^1.2.0",
     "pretty-bytes": "^5.1.0",
     "progress-bar-webpack-plugin": "^1.11.0",
     "raw-loader": "^0.5.1",
     "sass-loader": "^7.1.0",
-    "script-ext-html-webpack-plugin": "^2.0.1",
+    "script-ext-html-webpack-plugin": "^2.1.3",
-    "source-map-loader": "^0.2.3",
+    "source-map-loader": "^0.2.4",
-    "style-loader": "^0.22.1",
+    "style-loader": "^0.23.1",
-    "ts-loader": "^4.4.2",
+    "terser-webpack-plugin": "^1.1.0",
+    "ts-loader": "^5.3.0",
     "tslint": "^5.11.0",
-    "tslint-config-airbnb": "^5.9.2",
+    "tslint-config-airbnb": "^5.11.0",
     "tslint-config-semistandard": "^7.0.0",
     "tslint-react": "^3.6.0",
-    "typescript": "^2.9.2",
+    "typescript": "^3.1.6",
     "typings-for-css-modules-loader": "^1.7.0",
     "url-loader": "^1.1.2",
-    "webpack": "^4.19.1",
+    "webpack": "^4.25.1",
-    "webpack-bundle-analyzer": "^2.13.1",
+    "webpack-bundle-analyzer": "^3.0.3",
-    "webpack-cli": "^2.1.5",
+    "webpack-cli": "^3.1.2",
-    "webpack-dev-server": "^3.1.5",
+    "webpack-dev-server": "^3.1.10",
     "worker-plugin": "^1.1.1"
   }
 }

src/codecs/imagequant/options.tsx

@@ -1,6 +1,6 @@
 import { h, Component } from 'preact';
 import { bind } from '../../lib/initial-util';
-import { inputFieldValueAsNumber, konami } from '../../lib/util';
+import { inputFieldValueAsNumber, konami, preventDefault } from '../../lib/util';
 import { QuantizeOptions } from './processor-meta';
 import * as style from '../../components/Options/style.scss';
 import Expander from '../../components/expander';
@@ -42,7 +42,7 @@ export default class QuantizerOptions extends Component<Props, State> {
 
   render({ options }: Props, { extendedSettings }: State) {
     return (
-      <form class={style.optionsSection}>
+      <form class={style.optionsSection} onSubmit={preventDefault}>
         <Expander>
           {extendedSettings ?
             <label class={style.optionTextFirst}>

src/codecs/mozjpeg/options.tsx

@@ -1,6 +1,6 @@
 import { h, Component } from 'preact';
 import { bind } from '../../lib/initial-util';
-import { inputFieldChecked, inputFieldValueAsNumber } from '../../lib/util';
+import { inputFieldChecked, inputFieldValueAsNumber, preventDefault } from '../../lib/util';
 import { EncodeOptions, MozJpegColorSpace } from './encoder-meta';
 import * as style from '../../components/Options/style.scss';
 import Checkbox from '../../components/checkbox';
@@ -58,7 +58,7 @@ export default class MozJPEGEncoderOptions extends Component<Props, State> {
     // I'm rendering both lossy and lossless forms, as it becomes much easier when
     // gathering the data.
     return (
-      <form class={style.optionsSection}>
+      <form class={style.optionsSection} onSubmit={preventDefault}>
         <div class={style.optionOneCell}>
           <Range
             name="quality"

src/codecs/optipng/options.tsx

@@ -1,6 +1,6 @@
 import { h, Component } from 'preact';
 import { bind } from '../../lib/initial-util';
-import { inputFieldValueAsNumber } from '../../lib/util';
+import { inputFieldValueAsNumber, preventDefault } from '../../lib/util';
 import { EncodeOptions } from './encoder-meta';
 import Range from '../../components/range';
 import * as style from '../../components/Options/style.scss';
@@ -23,7 +23,7 @@ export default class OptiPNGEncoderOptions extends Component<Props, {}> {
 
   render({ options }: Props) {
     return (
-      <form class={style.optionsSection}>
+      <form class={style.optionsSection} onSubmit={preventDefault}>
         <div class={style.optionOneCell}>
           <Range
             name="level"

src/codecs/resize/options.tsx

@@ -1,7 +1,7 @@
 import { h, Component } from 'preact';
 import linkState from 'linkstate';
 import { bind, linkRef } from '../../lib/initial-util';
-import { inputFieldValueAsNumber, inputFieldValue } from '../../lib/util';
+import { inputFieldValueAsNumber, inputFieldValue, preventDefault } from '../../lib/util';
 import { ResizeOptions } from './processor-meta';
 import * as style from '../../components/Options/style.scss';
 import Checkbox from '../../components/checkbox';
@@ -78,7 +78,7 @@ export default class ResizerOptions extends Component<Props, State> {
 
   render({ options, isVector }: Props, { maintainAspect }: State) {
     return (
-      <form ref={linkRef(this, 'form')} class={style.optionsSection}>
+      <form ref={linkRef(this, 'form')} class={style.optionsSection} onSubmit={preventDefault}>
         <label class={style.optionTextFirst}>
           Method:
           <Select

src/codecs/webp/options.tsx

@@ -1,6 +1,6 @@
 import { h, Component } from 'preact';
 import { bind } from '../../lib/initial-util';
-import { inputFieldCheckedAsNumber, inputFieldValueAsNumber } from '../../lib/util';
+import { inputFieldCheckedAsNumber, inputFieldValueAsNumber, preventDefault } from '../../lib/util';
 import { EncodeOptions, WebPImageHint } from './encoder-meta';
 import * as style from '../../components/Options/style.scss';
 import Checkbox from '../../components/checkbox';
@@ -319,7 +319,7 @@ export default class WebPEncoderOptions extends Component<Props, State> {
     // I'm rendering both lossy and lossless forms, as it becomes much easier when
     // gathering the data.
     return (
-      <form class={style.optionsSection}>
+      <form class={style.optionsSection} onSubmit={preventDefault}>
         <label class={style.optionInputFirst}>
           <Checkbox
             name="lossless"

src/components/Output/index.tsx

@@ -48,6 +48,15 @@ export default class Output extends Component<Props, State> {
     const leftDraw = this.leftDrawable();
     const rightDraw = this.rightDrawable();
 
+    // Reset the pinch zoom, which may have an position set from the previous view, after pressing
+    // the back button.
+    this.pinchZoomLeft!.setTransform({
+      allowChangeEvent: true,
+      x: 0,
+      y: 0,
+      scale: 1,
+    });
+
     if (this.canvasLeft && leftDraw) {
       drawDataToCanvas(this.canvasLeft, leftDraw);
     }

src/components/compress/custom-els/MultiPanel/index.ts

@@ -103,7 +103,7 @@ export default class MultiPanel extends HTMLElement {
 
   // KeyDown event handler
   private _onKeyDown(event: KeyboardEvent) {
-    const selectedEl = document.activeElement;
+    const selectedEl = document.activeElement!;
     const heading = getClosestHeading(selectedEl);
 
     // if keydown event is not on heading element, ignore
@@ -252,8 +252,8 @@ export default class MultiPanel extends HTMLElement {
       return this.firstElementChild as HTMLElement;
     }
     // previous Element of active Element is previous Content,
-    // previous Element of previous Content  is previousHeading
+    // previous Element of previous Content is previousHeading
-    const previousContent = document.activeElement.previousElementSibling;
+    const previousContent = document.activeElement!.previousElementSibling;
     if (previousContent) {
       return previousContent.previousElementSibling as HTMLElement;
     }
@@ -263,7 +263,7 @@ export default class MultiPanel extends HTMLElement {
   private _nextHeading() {
     // activeElement would be the currently selected heading
     // 2 elemements after that would be the next heading.
-    const nextContent = document.activeElement.nextElementSibling;
+    const nextContent = document.activeElement!.nextElementSibling;
     if (nextContent) {
       return nextContent.nextElementSibling as HTMLElement;
     }

src/components/intro/index.tsx

@@ -129,6 +129,11 @@ export default class Intro extends Component<Props, State> {
         <ul class={style.relatedLinks}>
           <li><a href="https://github.com/GoogleChromeLabs/squoosh/">View the code</a></li>
           <li><a href="https://github.com/GoogleChromeLabs/squoosh/issues">Report a bug</a></li>
+          <li>
+            <a href="https://github.com/GoogleChromeLabs/squoosh/blob/master/README.md#privacy">
+              Privacy
+            </a>
+          </li>
         </ul>
       </div>
     );

src/components/intro/style.scss

@@ -48,6 +48,7 @@
 
 .logo {
   composes: abs-fill from '../../lib/util.scss';
+  pointer-events: none;
 }
 
 .open-image-guide {
@@ -144,6 +145,7 @@
 
 .demo-icon {
   composes: abs-fill from '../../lib/util.scss';
+  pointer-events: none;
 }
 
 .demo-description {

src/components/range/index.tsx

@@ -13,6 +13,8 @@ export default class Range extends Component<Props, State> {
   @bind
   private onTextInput(event: Event) {
     const input = event.target as HTMLInputElement;
+    const value = input.value.trim();
+    if (!value) return;
     this.rangeWc!.value = input.value;
     const { onInput } = this.props;
     if (onInput) onInput(event);

src/components/results/index.tsx

@@ -60,11 +60,16 @@ export default class Results extends Component<Props, State> {
 
   @bind
   onDownload() {
+    // GA can’t do floats. So we round to ints. We're deliberately rounding to nearest kilobyte to
+    // avoid cases where exact image sizes leak something interesting about the user.
+    const before = Math.round(this.props.source!.file.size / 1024);
+    const after = Math.round(this.props.imageFile!.size / 1024);
+    const change = Math.round(after / before * 1000);
+
     ga('send', 'event', 'compression', 'download', {
-      // GA can’t do floats. So we round to ints.
+      metric1: before,
-      metric1: Math.floor(this.props.source!.file.size),
+      metric2: after,
-      metric2: Math.floor(this.props.imageFile!.size),
+      metric3: change,
-      metric3: Math.floor(this.props.imageFile!.size / this.props.source!.file.size * 1000),
     });
   }
 

src/index.ts

@@ -13,11 +13,13 @@ if (!('customElements' in self)) {
   init();
 }
 
-window.ga = window.ga || ((...args) => (ga.q = ga.q || []).push(args));
+if (typeof PRERENDER === 'undefined') {
-ga('create', 'UA-128752250-1', 'auto');
+  window.ga = window.ga || ((...args) => (ga.q = ga.q || []).push(args));
-ga('set', 'transport', 'beacon');
+  ga('create', 'UA-128752250-1', 'auto');
-ga('send', 'pageview');
+  ga('set', 'transport', 'beacon');
-  // Load the GA script
+  ga('send', 'pageview');
-const s = document.createElement('script');
+    // Load the GA script
-s.src = 'https://www.google-analytics.com/analytics.js';
+  const s = document.createElement('script');
-document.head!.appendChild(s);
+  s.src = 'https://www.google-analytics.com/analytics.js';
+  document.head!.appendChild(s);
+}

src/lib/offliner.ts

@@ -42,6 +42,9 @@ async function updateReady(reg: ServiceWorkerRegistration): Promise<void> {
 
 /** Set up the service worker and monitor changes */
 export async function offliner(showSnack: SnackBarElement['showSnackbar']) {
+  // This needs to be a typeof because Webpack.
+  if (typeof PRERENDER === 'boolean') return;
+
   if (process.env.NODE_ENV === 'production') {
     navigator.serviceWorker.register('../sw');
   }
@@ -60,6 +63,10 @@ export async function offliner(showSnack: SnackBarElement['showSnackbar']) {
     location.reload();
   });
 
+  // If we don't have a controller, we don't need to check for updates – we've just loaded from the
+  // network.
+  if (!hasController) return;
+
   const reg = await navigator.serviceWorker.getRegistration();
   // Service worker not registered yet.
   if (!reg) return;

src/lib/util.ts

@@ -297,3 +297,10 @@ export async function transitionHeight(el: HTMLElement, opts: TransitionOptions)
     el.addEventListener('transitioncancel', listener);
   });
 }
+
+/**
+ * Simple event listener that prevents the default.
+ */
+export function preventDefault(event: Event) {
+  event.preventDefault();
+}

src/manifest.json

@@ -3,7 +3,7 @@
   "short_name": "Squoosh",
   "start_url": "/",
   "display": "standalone",
-  "orientation": "portrait",
+  "orientation": "any",
   "background_color": "#fff",
   "theme_color": "#f78f21",
   "icons": [

src/missing-types.d.ts

@@ -39,7 +39,3 @@ declare var ga: {
   (...args: any[]): void;
   q: any[];
 };
-
-interface Window {
-  ga: typeof ga;
-}

src/sw/util.ts

@@ -56,8 +56,6 @@ export async function cacheBasics(cacheName: string, buildAssets: string[]) {
   const toCache = ['/', '/assets/favicon.ico'];
 
   const prefixesToCache = [
-    // First interaction JS & CSS:
-    'first-interaction.',
     // Main app JS & CSS:
     'main-app.',
     // Service worker handler:

webpack.config.js

@@ -2,7 +2,7 @@ const fs = require('fs');
 const path = require('path');
 const webpack = require('webpack');
 const CleanPlugin = require('clean-webpack-plugin');
-const UglifyJsPlugin = require('uglifyjs-webpack-plugin');
+const TerserPlugin = require('terser-webpack-plugin');
 const ProgressBarPlugin = require('progress-bar-webpack-plugin');
 const MiniCssExtractPlugin = require('mini-css-extract-plugin');
 const OptimizeCssAssetsPlugin = require('optimize-css-assets-webpack-plugin');
@@ -14,6 +14,7 @@ const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPl
 const WorkerPlugin = require('worker-plugin');
 const AutoSWPlugin = require('./config/auto-sw-plugin');
 const CrittersPlugin = require('critters-webpack-plugin');
+const AssetTemplatePlugin = require('./config/asset-template-plugin');
 
 function readJson (filename) {
   return JSON.parse(fs.readFileSync(filename));
@@ -225,7 +226,7 @@ module.exports = function (_, env) {
       // For now we're not doing SSR.
       new HtmlPlugin({
         filename: path.join(__dirname, 'build/index.html'),
-        template: '!!prerender-loader?string!src/index.html',
+        template: isProd ? '!!prerender-loader?string!src/index.html' : 'src/index.html',
         minify: isProd && {
           collapseWhitespace: true,
           removeScriptTypeAttributes: true,
@@ -238,8 +239,11 @@ module.exports = function (_, env) {
         compile: true
       }),
 
-      new AutoSWPlugin({
+      new AutoSWPlugin({ version: VERSION }),
-        version: VERSION
+
+      isProd && new AssetTemplatePlugin({
+        template: path.join(__dirname, '_headers.ejs'),
+        filename: '_headers',
       }),
 
       new ScriptExtHtmlPlugin({
@@ -286,12 +290,10 @@ module.exports = function (_, env) {
 
     optimization: {
       minimizer: [
-        new UglifyJsPlugin({
+        new TerserPlugin({
           sourceMap: isProd,
-          extractComments: {
+          extractComments: 'build/licenses.txt',
-            file: 'build/licenses.txt'
+          terserOptions: {
-          },
-          uglifyOptions: {
             compress: {
               inline: 1
             },