rollup.config.prod.js

import sourceMaps from 'rollup-plugin-sourcemaps';
import typescript from 'rollup-plugin-typescript2';
import json from 'rollup-plugin-json';
import { nodeResolve } from '@rollup/plugin-node-resolve';
import commonjs from '@rollup/plugin-commonjs';
import pkg from './package.json';

export default {
  input: 'src/index.ts',
  output: [
    { dir: 'dist/umd', name: 'NftscanSDK', format: 'umd', sourcemap: true },
    {
      dir: 'dist/cjs',
      format: 'cjs',
      sourcemap: true,
    },
    {
      dir: 'dist/esm',
      format: 'esm',
      sourcemap: true,
    },
    {
      dir: 'dist/es',
      format: 'es',
      sourcemap: true,
    },
  ],
  // Indicate here external modules you don't wanna include in your bundle (i.e.: 'lodash')
  external: [...Object.keys(pkg.dependencies || {})],
  watch: {
    include: 'src/**',
  },
  plugins: [
    // Allow json resolution
    json(),
    // Compile TypeScript files
    typescript({ useTsconfigDeclarationDir: true }),
    // Allow bundling cjs modules (unlike webpack, rollup doesn't understand cjs)
    commonjs(),
    // Allow node_modules resolution, so you can use 'external' to control
    // which external modules to include in the bundle
    // https://github.com/rollup/rollup-plugin-node-resolve#usage
    nodeResolve(),

    // Resolve source maps to the original source
    sourceMaps(),
  ],
};