webpack-conditional-loader-react

Inspired by and modified from webpack-conditional-loader to work with react and the block comments used within JSX, conditional loader decides if a given block should be included in the final bundle.

Useful for removing instrumentation code and making your final production bundle smaller (therefore faster).

Installation

yarn add webpack-conditional-loader-react

or

npm install --save-dev webpack-conditional-loader-react

Usage

In your webpack.config.js

Put webpack-conditional-loader-react as the last loader in the array, so it will process the code before all others.

module: {
  rules: [{
    test: /\.js$/,
    use: ['babel-loader', 'webpack-conditional-loader-react']
  }]
}

Get an example config file here

On your code

Use {/*#if expression*/} and {/*#endif*/} to wrap blocks of code you want to be removed if a given predicate is false.

    <Fragment>
        Dashboard Component.
        {/*#if process.NODE_ENV === 'development'*/}
        <p>I am here for development purposes only</p>
        {/*#endif*/}
        {/*#if process.NODE_ENV !== 'development'*/}
        <p>I am here for everyones purposes</p>
        {/*#endif*/}
    </Fragment>

In the example above, the code will be removed if the enviroment variable NODE_ENV is not develpment, removing unnecessary code from your production bundle.

The same technique can be used to prevent loading packages in the production bundle.

Credits

• webpack-conditional-loader

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Reme Le Hane  ·  GitHub RemeJuan  ·  Twitter @RemeJuan