rollup.config.dev.js

import typescript from 'rollup-plugin-typescript';
import commonjs from 'rollup-plugin-commonjs';
import nodeResolve from 'rollup-plugin-node-resolve';
import serve from 'rollup-plugin-serve';
import livereload from 'rollup-plugin-livereload';
import postcss from 'rollup-plugin-postcss';
import image from 'rollup-plugin-image';
import babel from 'rollup-plugin-babel';

// PostCSS plugins
import simplevars from 'postcss-simple-vars';
import nested from 'postcss-nested';
import cssnext from 'postcss-cssnext';

export default {
  entry: './src/index.ts',
  treeshake: true,
  sourceMap: 'inline',
  moduleName: 'trs',

  plugins: [
    typescript({
      typescript: require('typescript')
    }),
    postcss({
      extensions: ['.css'],
      plugins: [
        simplevars(),
        nested(),
        cssnext({
          warnForDuplicates: false,
        }),
      ],
    }),
    image(),    
    babel({
      exclude: 'node_modules/**'
    }),

    // Locate modules using the Node resolution algorithm, for using third party modules 
    // in node_modules
    nodeResolve({
      // use "jsnext:main" if possible
      // – see https://github.com/rollup/rollup/wiki/jsnext:main
      jsnext: true,

      // some package.json files have a `browser` field which
      // specifies alternative files to load for people bundling
      // for the browser. If that's you, use this option, otherwise
      // pkg.browser will be ignored
      browser: true,
    }),

    // for using non-ES6 third party modules
    commonjs(),

    // for development, serve index.html and live reload script on change
    serve({
      // Folder to serve files from,
      contentBase: '',

      // Set to true to return index.html instead of 404
      historyApiFallback: false,

      // Options used in setting up server
      host: 'localhost',
      port: 8080
    }),
    livereload('dist')
  ],
  targets: [
    // for development browser build for script tag includes
    {
      dest: 'dist/index.js',
      format: 'iife'
    }
  ]
}