rollup.config.ts

import commonjs from 'rollup-plugin-commonjs'
import sourceMaps from 'rollup-plugin-sourcemaps'
import nodeResolve from 'rollup-plugin-node-resolve'
import dts from 'rollup-plugin-dts'
import typescript from 'rollup-plugin-typescript2'
import { terser } from 'rollup-plugin-terser'
import { resolve } from 'path'

const outputDirectory = resolve(__dirname, 'dist')
const inputFile = resolve(__dirname, 'src/index.ts')

const npmConfig = require(resolve(__dirname, `package.json`))

const external = Object.keys(npmConfig.dependencies || {})
const dev = Boolean(process.env.ROLLUP_WATCH)

export default [
  {
    input: inputFile,
    external,
    output: [
      {
        file: `${outputDirectory}/bundle.cjs.js`,
        format: 'cjs',
        sourceMap: true
      },
      {
        file: `${outputDirectory}/bundle.esm.js`,
        format: 'esm',
        sourceMap: true
      },
      {
        file: `${outputDirectory}/bundle.amd.js`,
        sourceMap: true,
        format: 'amd',
        name: 'Ecs'
      }
    ],
    plugins: [
      nodeResolve({
        extensions: ['.ts']
      }),
      commonjs(),
      typescript({
        tsconfig: resolve(__dirname, 'tsconfig.json')
      }),
      sourceMaps(),
      !dev && terser()
    ]
  },
  {
    input: inputFile,
    output: [{ file: `${outputDirectory}/index.d.ts`, format: 'es' }],
    plugins: [dts()]
  }
]