rollup.config.js

import babel from 'rollup-plugin-babel'
import json from 'rollup-plugin-json'
import autoExternal from 'rollup-plugin-auto-external'
import cleanup from 'rollup-plugin-cleanup'

const config = [
  {
    input: 'src/index.js',
    output: [
      {
        file: 'dist/web3-zsl.cjs.js',
        format: 'cjs'
      },
      {
        name: 'Web3',
        file: 'dist/web3-zsl.umd.js',
        format: 'umd',
        globals: {
          'web3': 'web3',
        }
      }
    ],
    plugins: [
      babel({
        exclude: 'node_modules/**',
        babelrc: false,
        runtimeHelpers: true,
        presets: [
          [
            '@babel/env',
            {
              modules: false,
              targets: {
                node: '6',
                browsers: 'last 2 versions'
              },
            },
          ],
        ],
        plugins: [
          '@babel/plugin-proposal-export-default-from',
          '@babel/plugin-proposal-export-namespace-from',
          ['@babel/plugin-transform-runtime', {'helpers': true, 'regenerator': true}],
        ],
      }),
      json(),
      autoExternal(),
      cleanup(),
    ],
  },
  {
    input: 'src/index.js',
    output: [
      {
        file: 'dist/web3-zsl.esm.js',
        format: 'es',
      },
    ],
    plugins: [
      babel({
        exclude: 'node_modules/**',
        babelrc: false,
        plugins: [
          '@babel/plugin-proposal-export-default-from',
          '@babel/plugin-proposal-export-namespace-from',
        ],
      }),
      json(),
      autoExternal(),
      cleanup(),
    ],
  },
]

export default config