// rollup.config.js
import redirect from 'rollup-plugin-redirect-files';

export default {
    input: 'src/index.js',
    output: {
        file: 'dist/bundle.js',
        format: 'cjs'
    },
    plugins: {
        redirect({
            verbose: false, // output redirected files to console
            targets: [
                { from: '^(.*regex)[0-9]*(.*)$', to: '$1$2' }, // redirect a.regex23.b → a.regex.b
                { fromExt: 'env', toExt: 'prod' }, // redirect config.env.js → config.prod.js
                { fromExt: '.env', toExt: '.prod' }, // same thing, style choice
                { fromExt: 'env', toExt: process.env.BUILD } // run rollup with `--environment BUILD:prod`
            ]
        });
    }
};

{
    from: `^(.*)\\${fromExt}(.*)$`,
    to: `$1${toExt}$2`
}