Babel preset used by Create React App
Create React apps with no build configuration.
- Creating an App – How to create a new app.
- User Guide– How to develop apps bootstrapped with Create React App.
npx create-react-app my-app cd my-app npm start
If you've previously installed
npm install -g create-react-app, we recommend you uninstall the package using
npm uninstall -g create-react-appto ensure that npx always uses the latest version.
Then open http://localhost:3000/to see your app.
When you’re ready to deploy to production, create a minified bundle with
npm run build.
You don’tneed to install or configure tools like Webpack or Babel. They are preconfigured and hidden so that you can focus on the code.
Create a project, and you’re good to go.
You’ll need to have Node 8.16.0 or Node 10.16.0 or later version on your local development machine(but it’s not required on the server). You can use nvm(macOS/Linux) or nvm-windowsto switch Node versions between different projects.
To create a new app, you may choose one of the following methods:
npx create-react-app my-app
npm init react-app my-app
npm init <initializer>is available in npm 6+
yarn create react-app my-app
yarn create <starter-kit-package>is available in Yarn 0.25+
It will create a directory called
my-appinside the current folder.
Inside that directory, it will generate the initial project structure and install the transitive dependencies:
my-app ├── README.md ├── node_modules ├── package.json ├── .gitignore ├── public │ ├── favicon.ico │ ├── index.html │ └── manifest.json └── src ├── App.css ├── App.js ├── App.test.js ├── index.css ├── index.js ├── logo.svg └── serviceWorker.js
No configuration or complicated folder structures, only the files you need to build your app. Once the installation is done, you can open your project folder:
Inside the newly created project, you can run some built-in commands:
Runs the app in development mode. Open http://localhost:3000to view it in the browser.
The page will automatically reload if you make changes to the code. You will see the build errors and lint warnings in the console.
Runs the test watcher in an interactive mode. By default, runs tests related to files changed since the last commit.
Builds the app for production to the
It correctly bundles React in production mode and optimizes the build for the best performance.
The build is minified and the filenames include the hashes.
Your app is ready to be deployed.
You can find detailed instructions on using Create React App and many tips in its documentation.
Please refer to the User Guidefor this and other information.
One Dependency:There is only one build dependency. It uses Webpack, Babel, ESLint, and other amazing projects, but provides a cohesive curated experience on top of them.
No Configuration Required:You don't need to configure anything. A reasonably good configuration of both development and production builds is handled for you so you can focus on writing code.
No Lock-In:You can “eject” to a custom setup at any time. Run a single command, and all the configuration and build dependencies will be moved directly into your project, so you can pick up right where you left off.
Your environment will have everything you need to build a modern single-page React app:
- React, JSX, ES6, TypeScript and Flow syntax support.
- Language extras beyond ES6 like the object spread operator.
- Autoprefixed CSS, so you don’t need
-webkit-or other prefixes.
- A fast interactive unit test runner with built-in support for coverage reporting.
- A live development server that warns about common mistakes.
- A build script to bundle JS, CSS, and images for production, with hashes and sourcemaps.
- An offline-first service workerand a web app manifest, meeting all the Progressive Web Appcriteria. (_Note: Using the service worker is opt-in as of
- Hassle-free updates for the above tools with a single dependency.
Check out this guidefor an overview of how these tools fit together.
The tradeoff is that these tools are preconfigured to work in a specific way. If your project needs more customization, you can "eject"and customize it, but then you will need to maintain this configuration.
Create React App is a great fit for:
- Learning Reactin a comfortable and feature-rich development environment.
- Starting new single-page React applications.
- Creating exampleswith React for your libraries and components.
Here are a few common cases where you might want to try something else:
If you want to try Reactwithout hundreds of transitive build tool dependencies, consider using a single HTML file or an online sandbox instead.
If you need to integrate React code with a server-side template frameworklike Rails, Django or Symfony, or if you’re not building a single-page app, consider using nwb, or Neutrinowhich are more flexible. For Rails specifically, you can use Rails Webpacker. For Symfony, try Symfony's Webpack Encore.
If your website is mostly static(for example, a portfolio or a blog), consider using Gatsbyinstead. Unlike Create React App, it pre-renders the website into HTML at the build time.
All of the above tools can work with little to no configuration.
If you prefer configuring the build yourself, follow this guide.
Looking for something similar, but for React Native? Check out Expo CLI.
We'd love to have your helping hand on
create-react-app! See CONTRIBUTING.mdfor more information on what we're looking for and how to get started.
This project exists thanks to all the people who contribute.
Thanks to Netlifyfor hosting our documentation.
We are grateful to the authors of existing related projects for their ideas and collaboration:
Create React App is open source software licensed as MIT.
以上是 @0xaio/babel-preset-react-app 的使用教程帮助文档。