rollup.config.js

// Adapted from https://github.com/rollup/rollup-starter-lib/
import json from '@rollup/plugin-json';
import resolve from '@rollup/plugin-node-resolve';
import commonjs from '@rollup/plugin-commonjs';
//import replace from 'rollup-plugin-replace'
import pkg from './package.json';

export default [
  // browser-friendly UMD build
  // {
  //   input: 'src/index.js',
  //   external: [
  //     'ms',
  //     'bip39',
  //     'eciesjs',
  //     '@cosmjs/launchpad',
  //     '@cityofzion/neon-core',
  //     '@cityofzion/neon-js',
  //     '@polkadot/util-crypto',
  //     '@polkadot/keyring',
  //     'axios'
  //   ],
  //   output: {
  //     name: pkg.name,
  //     file: pkg.browser,
  //     format: 'umd'
  //   },
  //   plugins: [
  //     resolve({
  //       browser: true
  //     }),
  //     // replace(),
  //     commonjs(),
  //     json()
  //   ]
  // },

  {
    input: 'src/index.js',
    external: [
      'ms',
      '@cosmostation/cosmosjs',
      '@polkadot/util-crypto',
      '@polkadot/keyring',
      '@solana/web3.js',
      'avalanche',
      'axios',
      'bs58',
      'sha.js',
      'bip39',
      'bip32',
      'elliptic',
      'eciesjs',
      'ethers',
      'tweetnacl'
    ],
    output: [
      { file: pkg.main, format: 'cjs' },
      { file: pkg.module, format: 'es' }
    ],
    plugins: [
    ]
  }
];