Note that the project only includes a few ES6 polyfills: While we recommend using experimental proposals with some caution, Facebook heavily uses these features in the product code, so we intend to provide codemods if any of these proposals change in the future. Learn more about different proposal stages. Class Fields and Static Properties (part of stage 3 proposal).Object Rest/Spread Properties (stage 3 proposal).In addition to ES6 syntax features, it also supports:

This project supports a superset of the latest JavaScript standard. Supported Language Features and Polyfills We commit to keeping the breaking changes minimal so you can upgrade react-scripts painlessly. In most cases bumping the react-scripts version in package.json and running npm install in this folder should be enough, but it’s good to consult the changelog for potential breaking changes. To update an existing project to a new version of react-scripts, open the changelog, find the version you’re currently on (check package.json in this folder if you’re not sure), and apply the migration instructions for the newer versions. When you run create-react-app, it always creates the project with the latest version of react-scripts so you’ll get all the new features and improvements in newly created apps automatically. You almost never need to update create-react-app itself: it delegates all the setup to react-scripts. react-scripts is a development dependency in the generated projects (including this one).create-react-app is a global command-line utility that you use to create new projects.Injecting Data from the Server into the PageĬreate React App is divided into two packages:.'Invalid Host Header' Errors After Configuring Proxy.Adding Development Environment Variables In.Adding Temporary Environment Variables In Your Shell.Referencing Environment Variables in the HTML.Adding Assets Outside of the Module System.Adding a CSS Preprocessor (Sass, Less etc.).Supported Language Features and Polyfills.

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