rollup.config.js

const path = require("path")
const { readFileSync, writeFileSync } = require("fs");

import buble from "rollup-plugin-buble"
import commonjs from "rollup-plugin-commonjs"
import resolve from "rollup-plugin-node-resolve"
import {uglify} from "rollup-plugin-uglify"
import replace from "rollup-plugin-replace"
import includePaths from "rollup-plugin-includepaths"

function manifest(location) {
  let entries = {}
  return {
    name: "manifest",
    renderChunk(code, chunk, options) {
      if(chunk.isEntry) {
        entries[`${chunk.name}.js`] = chunk.fileName
      }
    },
    writeBundle(bundle) {
      let existing = {}
      try {
        existing = JSON.parse(readFileSync(location, "utf-8"));
      } catch (e) {
        existing = {}
      }

      writeFileSync(
        path.resolve(process.cwd(), location),
        JSON.stringify(Object.assign(existing, entries), null, 2),
        "utf8"
      )
    }
  }
}

export default {
  external: ["jquery"],
  plugins: [
    includePaths({
      include: {},
      paths: [`${process.env.npm_package_config_paths_src}/js`],
      external: [],
      extensions: [".js", ".json"]
    }),
    resolve({
      jsnext: true, // Default: false
      main: true, // Default: true
      browser: true,
      extensions: [".js", ".json"]
    }),
    commonjs({
      include: ["node_modules/**", `${process.env.npm_package_config_paths_src}/**`],
      extensions: [".js", ".json"],
      // if false then skip sourceMap generation for CommonJS modules
      sourceMap: true, // Default: true
    }),
    buble(),
    replace({
      exclude: "node_modules/**",
      "process.env.NODE_ENV": JSON.stringify(process.env.NODE_ENV || "development"),
    }),
    (process.env.NODE_ENV === "production" && uglify()),
    (process.env.NODE_ENV === "production" && manifest(`${process.env.npm_package_config_paths_dest}/manifest.json`))
  ],
  output: {
    entryFileNames: (process.env.NODE_ENV === "production") ? "[name].[hash].js" : "[name].js",
		chunkFileNames: (process.env.NODE_ENV === "production") ? "[name].[hash].js" : "[name].js",
    format: "iife",
    globals: {
      jquery: "$"
    },
    sourcemap: (process.env.NODE_ENV !== "production") ? true : false
  }
}