rollup.config.js

import resolve from 'rollup-plugin-node-resolve';
import commonjs from 'rollup-plugin-commonjs';
import buble from 'rollup-plugin-buble';
import license from 'rollup-plugin-license';
import replace from 'rollup-plugin-replace';
import path from 'path';

import {uglify} from 'rollup-plugin-uglify';

const minify = !process.env.ROLLUP_WATCH && !process.env.DEV;
/** globals process, __dirname **/

module.exports = [
    bundle('index.js', 'chroma'),
    bundle('index-light.js', 'chroma-light'),
];

function bundle(input, target) {
    return {
        input,
        output: {
            file: `${target}${minify ? '.min' : ''}.js`,
            format: 'umd',
            name: 'chroma',
        },
        plugins: [
            resolve(),
            commonjs(),

        replace({
                delimiters: ['@@', ''],
                'version': require('./package.json').version
            }),

            // If we're building for production (npm run build
            // instead of npm run dev), transpile and minify
            buble({
                transforms: { dangerousForOf: true }
            }),
            minify && uglify({
                 mangle: true
            }),
            license({
                sourcemap: true,
                //cwd: '.', // Default is process.cwd()

                banner: {
                    content: {
                        file: path.join(__dirname, 'LICENSE')
                    }
                }
            }),
        ]
    }
}