rollup.scripts.js

import babel from 'rollup-plugin-babel';
import license from 'rollup-plugin-license';
import { terser } from 'rollup-plugin-terser';
import prettier from 'rollup-plugin-prettier';

const createBanner = ({ id, version, license, homepage }) => ({banner:`/*!
 * ${ id } ${ version }
 * Licensed under ${ license }, https://opensource.org/licenses/${ license }/
 * Please visit ${ homepage } for details.
 */
/* eslint-disable */
`});

const createBuild = (options) => {
  const { format, id, name, minify = false, transpile = false } = options;

  // get filename
  const filename = ['dist/', name];
  if (format === 'es') {
    filename.push('.esm');
  }
  if (minify) {
    filename.push('.min');
  }
  filename.push('.js');

  // collect plugins
  const plugins = [];
  if (transpile) {
    plugins.push(babel({
      exclude: ['node_modules/**']
    }))
  }
  if (minify) {
    plugins.push(terser())
  }
  else {
    plugins.push(prettier({
      singleQuote: true,
      parser: 'babel'
    }))
  }
  plugins.push(license(createBanner(options)))
  
  // return Rollup config
  return {
    input: 'src/js/index.js',
    treeshake: false,
    output: [
      {
        format,
        name: id,
        file: filename.join('')
      }
    ],
    plugins
  }
};

export default (metadata, configs) => configs.map(config => createBuild({ ...metadata, ...config }));