HTML 3 JavaScript 2

Deployment 28 Supported Language Features and Polyfills 10 Running Tests 10 Troubleshooting 8 Adding Flow 4 Proxying API Requests in Development 3 Debugging in the Editor 3 Adding a CSS Preprocessor (Sass, Less etc.) 2 Making a Progressive Web App 2 Formatting Code Automatically 2 Using the `public` Folder 2 Adding a Stylesheet 2 Pre-Rendering into Static HTML Files 2 Syntax Highlighting in the Editor 1 Injecting Data from the Server into the Page 1 Changing the Page `<title>` 1 Importing a Component 1 Analyzing the Bundle Size 1 Updating to New Releases 1 Sending Feedback 1 Integrating with an API Backend 1 Displaying Lint Output in the Editor 1 Available Scripts 1 Can I Use Decorators? 1 Adding Bootstrap 1 Developing Components in Isolation 1

[Firebase](https://firebase.google.com/) 17 `npm run eject` 12 Configuring a WebSocket Proxy 6 WebStorm 4 Using a Custom Theme 4 `Button.js` 3 `npm start` doesn’t detect changes 3 When to Use the `public` Folder 3 `npm test` hangs on macOS Sierra 3 Visual Studio Code 2 Disabling jsdom 2 [GitHub Pages](https://pages.github.com/) 2 Serving Apps with Client-Side Routing 2 [Heroku](https://www.heroku.com/) 1 Offline-First Considerations 1 Getting Started with Storybook 1 Coverage Reporting 1 Moment.js locales are missing 1 Other Solutions 1 [Azure](https://azure.microsoft.com/) 1 Writing Tests 1 With React Router 1 Building for Relative Paths 1 Snapshot Testing 1 Testing Components 1 [Surge](https://surge.sh/) 1 `npm run build` exits too early 1 [Netlify](https://www.netlify.com/) 1 [Now](https://zeit.co/now) 1 Command Line Interface 1 Ruby on Rails 1 On CI servers 1 `DangerButton.js` 1 Getting Started with Styleguidist 1 Progressive Web App Metadata 1 "Invalid Host Header" Errors After Configuring Proxy 1 Adding Development Environment Variables In `.env` 1 `npm start` 1 Editor Integration 1

yaml 2 vue 2 typescript 2 scss 2 printer 2 prettier 2 markdown 2 less 2 jsx 2 json 2 javascript 2 html 2 graphql 2 formatter 2 flow 2 css 2 ast 2 angular 2