rollup.config.js

import babel from '@rollup/plugin-babel';
import commonjs from '@rollup/plugin-commonjs';
import resolve from '@rollup/plugin-node-resolve';
import { stripIndent } from 'common-tags';
import { uglify } from 'rollup-plugin-uglify';

const uglifyOptions = {
  mangle: false,
  compress: false,
  output: {
    beautify: true,
    indent_level: 2,
    preamble:
      stripIndent`
      /*
       * Warning: This file is auto-generated, do not modify. Instead, make your changes in 'app/javascript/beyond_canvas/' and run \`yarn build\`
       */
      //= require jquery3
      //= require rails-ujs
      //= require_self
    ` + '\n',
  },
};

export default {
  input: 'app/javascript/beyond_canvas/base.js',
  output: {
    file: 'app/assets/javascripts/beyond_canvas/base.js',
    format: 'umd',
    name: 'ActiveAdmin',
  },
  plugins: [
    resolve(),
    commonjs(),
    babel(),
    uglify(uglifyOptions)
  ],
  // Use client's yarn dependencies instead of bundling everything
  external: [
    'jquery'
  ]
};