rollup.config.js

/* eslint-env node */
import pkg from './package.json';
import babel from 'rollup-plugin-babel';
import replace from 'rollup-plugin-replace';
import uglify from 'rollup-plugin-uglify';

const minify = process.env.NODE_ENV === 'production';

const banner = `/**
 * ${pkg.name} - ${pkg.description}
 * @version v${pkg.version}
 * @link ${pkg.homepage}
 * @license ${pkg.license}
 **/
`;

const [ filename ] = pkg.main.split( '/' ).reverse();
let name = filename.replace( '.js', '' );
const file = minify ? pkg.main.replace( '.js', '.min.js' ) : pkg.main;
const plugins = [
  replace({
    'Array.from': 'Array.prototype.slice.call'
  }),
  babel({
    exclude: 'node_modules/**'
  })
];

name = name.charAt( 0 ).toUpperCase() + name.slice( 1 );

if( minify ){
  plugins.push( uglify({
    output: {
      'comments': ( node, comment ) => {
        const text = comment.value,
          type = comment.type;

        if ( type === 'comment2' ) {
          // multiline comment
          return /@preserve|@license|@cc_on/i.test( text );
        }
      }
    }
  }));
}

export default {
  input: pkg.module,
  output: {
    banner,
    file,
    format: 'umd',
    indent: '  ',
    name
  },
  plugins
};