Create Multiple JavaScript Bundles with rollup and gulp

gulpfile.js

const gulp = require('gulp')
const gutil = require('gulp-util')
const rollup = require('./rollup')

const jsModules = [
  {
    entry: 'src/js/main.js',
    dest: 'dist/js/main.min.js'
  },
  {
    entry: 'src/js/index.js',
    dest: 'dist/js/index.min.js'
  },
  {
    entry: 'src/js/some_other.js',
    dest: 'dist/js/some_other.min.js'
  }
]

gulp.task('rollup', function(callback) {
   rollup(jsModules, gutil, callback)
})

rollup.js

const rollup = require('rollup').rollup
const babel = require('rollup-plugin-babel')
const eslint = require('rollup-plugin-eslint')
const resolve = require('rollup-plugin-node-resolve')
const commonjs = require('rollup-plugin-commonjs')
const replace = require('rollup-plugin-replace')
const uglify = require('rollup-plugin-uglify')

module.exports = (modules, logger, callback) => {
  modules.forEach((module, i) => {
    rollup({
      entry: module.entry,
      plugins: [
        resolve({
          jsnext: true,
          main: true,
          browser: true
        }),
        commonjs(),
        eslint(),
        babel({
          exclude: 'node_modules/**'
        }),
        replace({
          ENV: JSON.stringify(process.env.NODE_ENV || 'development')
        }),
        (process.env.NODE_ENV === 'production' && uglify())
      ]
    })
    .then( bundle => {
      bundle.write({
        dest: module.dest,
        sourceMap: 'inline'
      })

      if (i === modules.length - 1) {
        callback()
      }
    })
    .catch(err => logger.log(err))
  })
}