![]() ![]() This can also help with code splitting because only the CSS necessary for the components that you render will be loaded. You can also load CSS using a standard element in your HTML file, but referencing CSS from your components helps make it clear which components depend on which CSS. You can import a CSS file into a JavaScript or TypeScript file to load it along with a component. Parcel supports many different ways of styling applications written with React. ![]() See the Flow docs for more details on using Flow with Parcel. This also signals to Parcel which files can have Flow types that should be stripped when compiling for the browser. Then, use the // directive at the top of the files you'd like to type check. To add it to an existing project, first install flow-bin as a dependency: yarn add flow-bin -dev Flow #įlow is supported automatically when it is installed. See the TypeScript docs for more details on using TypeScript with Parcel. To add TypeScript definitions for React, install the following packages into your project: yarn add -dev tsx file from your HTML page, and Parcel will compile it as you'd expect. ![]() Keep entry components in their own files – Entry components should be in a separate file from the one that calls createRoot or they will be remounted on every change.įor more tips, see the official React Fast Refresh docs.Use a named function, or assign the arrow function to a variable instead. Avoid unnamed default exports – Declaring components using a default exported arrow function will cause state to be reset when it is changed.To preserve state, only export React components and move other exports to a different file if possible. Export only React components – If a file exports a mix of React components and other types of values, its state will be reset whenever it changes.Avoid class components – Fast Refresh only works with function components (and Hooks).See the Hot reloading docs for details on how this works. In most cases, it can preserve component state as code is edited, even if you make an error. Parcel has first-class support for React Fast Refresh, which gives you quick feedback as you edit your code without needing to reload the page. To learn more about JSX, see Introducing JSX and JSX In Depth in the React docs, and the JSX section from Parcel's JavaScript docs for details on how you can configure some details of how it's handled. If you’re using React 17 or later, it also automatically enables the modern JSX transform, which means you don't even need to import React for JSX to work, as you can see in App.js in the above example. Parcel supports JSX automatically when it detects you are using React. See Building a web app with Parcel for more details on getting started with a new project. This imported react-dom and used it to render our App component into the element in our page. Parcel follows the dependencies (such as a tag) from there to build your app.Īs you can see, we’ve referenced index.js from a element in our HTML file. Most Parcel apps start with an HTML file. Getting started #įirst, install react and react-dom into your project: yarn add react react-dom It includes a first-class development experience with Fast Refresh, and supports JSX, TypeScript, Flow, and many styling methodologies out of the box. Parcel works great for building single or multi-page React applications. ![]()
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