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@babel/plugin-transform-react-pure-annotations

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@babel/plugin-transform-react-pure-annotations

Mark top-level React method calls as pure for tree shaking

  • 7.25.9
  • latest
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increased by5.35%
Maintainers
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What is @babel/plugin-transform-react-pure-annotations?

The @babel/plugin-transform-react-pure-annotations package is a Babel plugin designed to enhance optimization for React components by automatically annotating React components with `/*#__PURE__*/` comments. These comments signal to JavaScript bundlers and minifiers, such as Terser, that the component functions can be safely tree-shaken if they are not used. This can lead to smaller bundle sizes in production builds.

What are @babel/plugin-transform-react-pure-annotations's main functionalities?

Automatic Pure Annotation for Functional Components

Automatically adds pure annotations to functional React components, indicating that they can be safely removed if unused.

Before:
const MyComponent = () => <div>Hello World</div>;

After:
const MyComponent = /*#__PURE__*/() => <div>Hello World</div>;

Automatic Pure Annotation for Class Components

Automatically adds pure annotations to the return value of render methods in class components, aiding in their potential tree-shaking.

Before:
class MyComponent extends React.Component {
  render() {
    return <div>Hello World</div>;
  }
}

After:
class MyComponent extends React.Component {
  render() {
    return /*#__PURE__*/<div>Hello World</div>;
  }
}

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Package last updated on 22 Oct 2024

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