rollup.config.js

import svelte from 'rollup-plugin-svelte'
import commonjs from '@rollup/plugin-commonjs'
import resolve from '@rollup/plugin-node-resolve'
import livereload from 'rollup-plugin-livereload'
import {terser} from 'rollup-plugin-terser'
import css from 'rollup-plugin-css-only'

const {name} = require('./package')

const production = !process.env.ROLLUP_WATCH

function serve () {
  let server

  function toExit () {
    if (server) server.kill(0)
  }

  return {
    writeBundle () {
      if (server) return
      server = require('child_process').spawn('npm', ['run', 'start', '--', '--dev'], {
        stdio: ['ignore', 'inherit', 'inherit'],
        shell: true
      })

      process.on('SIGTERM', toExit)
      process.on('exit', toExit)
    }
  }
}

export default {
  input: 'src/main.js',
  output: {
    sourcemap: true,
    format: 'umd',
    name: `${name}-[name]`,
    file: 'public/build/bundle.js'
  },
  plugins: [
    svelte({
      compilerOptions: {
        // enable run-time checks when not in production
        dev: !production
      }
    }),
    // we'll extract any component CSS out into
    // a separate file - better for performance
    css({output: 'bundle.css'}),

    // If you have external dependencies installed from
    // npm, you'll most likely need these plugins. In
    // some cases you'll need additional configuration -
    // consult the documentation for details:
    // https://github.com/rollup/plugins/tree/master/packages/commonjs
    resolve({
      browser: true,
      dedupe: ['svelte']
    }),
    commonjs(),

    // In dev mode, call `npm run start` once
    // the bundle has been generated
    !production && serve(),

    // Watch the `public` directory and refresh the
    // browser on changes when not in production
    !production && livereload('public'),

    // If we're building for production (npm run build
    // instead of npm run dev), minify
    production && terser()
  ],
  watch: {
    clearScreen: false
  }
}