rollup.config.js

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


const isProd = process.env.env === 'production';

const format = process.env.format || 'umd';
const isES = format === 'es';
const file = 'dist/ispin' +
  (format !== 'umd' ? '.' + format : '') +
  (isProd ? '.min' : '') +
  '.js';

const input = 'src/ispin.js';

const babelConf = isES ? {
  presets: [
    ['@babel/preset-env', {
      modules: false,
      useBuiltIns: 'entry',
      targets: {
        browsers: [
          'Chrome >= 60',
          'Safari >= 10.1',
          'iOS >= 10.3',
          'Firefox >= 54',
          'Edge >= 15',
        ],
      },
    }],
    '@babel/preset-flow',
  ],
} : {
  presets: [
    ['@babel/preset-env', {
      'modules': false,
      'useBuiltIns': 'entry'
    }],
    '@babel/preset-flow',
  ],
  exclude: 'node_modules/**',
  plugins: ['@babel/plugin-proposal-object-rest-spread', '@babel/plugin-transform-object-assign']
};


export default {
  input,
  output: {
    file,
    format,
    name: 'ISpin',
    sourcemap: true,
  },
  plugins: [
    eslint({configFile: '.eslintrc'}),
    resolve(),
    babel(babelConf),
    !isES && commonjs(),
    isProd && terser()
  ]
}