JS File extensions
Use .js for JavaScript file extensions. Avoid using .jsx.
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Rationale
Here are a few reasons to avoid the .jsx file extension: • Not recommended by the React team — The React themselves doesn't recommend the .jsx extension. The official create-react-app only later started supporting it in 2016 (v0.4.1). • Lack of support — Webpack, Node.js, and browsers do not support the .jsx file extension by default. It's possible to configure Webpack to support .jsx files, but this is more of an "aftermarket" tweak than a typical use case. • Developer friction — If you were to add a line of JSX into a .js file, you'd need to rename it to .jsx. This hurts the ergonomics of the developer experience, as noted by Dan Abramov in this comment.
References
See these online discussions on the issue: • https://github.com/airbnb/javascript/pull/985#issuecomment-239145468 • https://github.com/facebook/create-react-app/issues/87#issuecomment-234627904
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