rollup.lib.js

import resolve from "rollup-plugin-node-resolve";
import commonjs from "rollup-plugin-commonjs";
import babel from "rollup-plugin-babel";
import json from "rollup-plugin-json";
import compiler from "@ampproject/rollup-plugin-closure-compiler";
import bundleSize from "rollup-plugin-bundle-size";
import pkg from "./package.json";

const sourcemapOption = process.env.PROD ? undefined : "inline";

const babelPluginConfig = {
  // so Rollup can convert unsupported es6 code to es5
  exclude: ["node_modules/**"],
  plugins: [
    ["@babel/plugin-proposal-class-properties"],
    ["@babel/plugin-proposal-object-rest-spread"]
  ]
};

let plugins = [resolve(), commonjs(), json(), babel(babelPluginConfig)];

if (process.env.PROD) {
  plugins = [...plugins, compiler(), bundleSize()];
}

const libBundles = [
  {
    input: "lib/lib.js",
    output: {
      file: pkg.main,
      format: "cjs",
      sourcemap: sourcemapOption
    },
    watch: {
      clearScreen: false
    },
    plugins: plugins
  },
  {
    input: "lib/lib.js",
    output: {
      file: pkg.module,
      format: "esm",
      sourcemap: sourcemapOption
    },
    watch: {
      clearScreen: false
    },
    plugins: plugins
  },
  {
    input: "lib/lib.js",
    output: {
      file: pkg.iife,
      format: "iife",
      sourcemap: sourcemapOption,
      name: "AsBindIIFE"
    },
    watch: {
      clearScreen: false
    },
    plugins: plugins
  }
];

export default libBundles;