Conditional Import based on environment variable

Question

I have a react component which has X options for a stylesheet to be imported which is using CSS Modules.

I ideally want to have a global environment variable fetched

Answer 1

For example as a workaround when your component is mounting you can try check env variables and then require specific css file like below:

class App extends Component {
    componentWillMount() {
         if(process.env.CUSTOM_ENV_VAR === 'test') {
            require('styles1.css');
         } else {
            require('styles2.css');
         }
    }
}

Resolving it as a promise should do the trick with css modules:

if (process.env.CUSTOM_ENV_VAR === 'theme1') {
    import('./theme1.css').then(() => {
        // ...
    });
else (process.env.CUSTOM_ENV_VAR === 'theme2') {
    import('./theme2.css').then(() => {
        //...
    });
}

import(`./${process.env.CUSTOM_ENV_VAR}.css`).then(() => {
    //...
});

reference-part: ES6 Module Loader