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 = {
    input: 'index.js',
    output: {
        file: `chroma${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: {
                file: path.join(__dirname, 'LICENSE'),
                encoding: 'utf-8', // Default is utf-8
            }
        }),
    ]
};