babel-plugin-env-constants

Transform __DEV__, __PROD__, and __TEST__ constants to process.env.NODE_ENV conditionals.

// Input
if (__DEV__) {
  console.log('Some message in development!');
}

const value = __TEST__ ? 0 : 100;

// Output
if (process.env.NODE_ENV !== 'production') {
  console.log('Some message in development!');
}

const value = process.env.NODE_ENV === 'test' ? 0 : 100;

Installation

yarn add --dev babel-plugin-env-constants

Add the plugin to your root babel.config.* file.

module.exports = {
  plugins: ['babel-plugin-env-constants'],
};

And if you are using TypeScript, you'll most likely need to declare the globals yourself.

declare global {
  const __DEV__: boolean;
  const __PROD__: boolean;
  const __TEST__: boolean;
}

Requirements

• Linux, OSX, Windows
• Node 14.15+