rollup.config.js

import nodeResolve from 'rollup-plugin-node-resolve';
import babel from 'rollup-plugin-babel';
import { uglify } from 'rollup-plugin-uglify';
import pkg from './package.json';

const banner = `/* ${pkg.name} v${pkg.version} - ${pkg.author} */`;
export default {
  banner,
  input: 'src/index.js',
  plugins: [
    nodeResolve(),
    babel(),
    process.env.NODE_ENV === 'production' &&
      uglify({
        output: {
          // Preserve banner
          preamble: banner,
        },
      }),
  ],
  output:
    process.env.NODE_ENV === 'production'
      ? {
          format: process.env.TARGET === 'bowser' ? 'amd' : 'cjs',
          file: `dist/${
            process.env.TARGET === 'bowser' ? 'index.amd' : 'index'
          }.min.js`,
          sourcemap: true,
        }
      : {
          format: process.env.TARGET === 'bowser' ? 'amd' : 'cjs',
          file: `dist/${
            process.env.TARGET === 'bowser' ? 'index.amd' : 'index'
          }.js`,
        },
};