rollup.js

import {eslint} from 'rollup-plugin-eslint';
import babel from 'rollup-plugin-babel';
import resolve from 'rollup-plugin-node-resolve';
import commonjs from 'rollup-plugin-commonjs';
import replace from 'rollup-plugin-replace';
import {terser} from 'rollup-plugin-terser';

export default [{
  input: 'src/js/player51.js',
  output: [
    {
      file: 'build/cjs/player51.min.js',
      format: 'cjs',
      name: 'Player51',
    },
    {
      file: 'build/iife/player51.min.js',
      format: 'iife',
      name: 'Player51',
    },
  ],
  plugins: [
    resolve(),
    commonjs(),
    eslint({
      exclude: [
        'node_modules/**',
        'src/css/**',
      ],
    }),
    babel({
      exclude: 'node_modules/**',
    }),
    replace({
      exclude: 'node_modules/**',
      ENV: JSON.stringify(process.env.NODE_ENV || 'dev'),
    }),
    ((process.env.NODE_ENV === 'prod' || process.env.NODE_ENV === 'production')
     && terser()),
  ],
}];