rollup.config.js

import commonjs from 'rollup-plugin-commonjs'
// import livereload from 'rollup-plugin-livereload'
import polyfill from 'rollup-plugin-polyfill'
import typescript from 'rollup-plugin-typescript2'
// import {liveServer} from 'rollup-plugin-live-server';

let defaults = { compilerOptions: { declaration: true } }

const plugins = [
  typescript({
    tsconfigDefaults: defaults,
    tsconfig: 'tsconfig.json',
    // tsconfigOverride: override,
    outDir: './build',
  }),
  commonjs(),
  // livereload(),
  polyfill(['./index.ts']),
  // serve({
  //   open: true,
  // }),
]

export default {
  input: './src/index.ts',
  output: [
    {
      file: './build/index.es.js',
      format: 'es',
    },
    {
      file: './build/index.js',
      format: 'cjs',
    },
  ],
  plugins,
}