rollup.config.js

import replace from "rollup-plugin-replace";
import { uglify } from "rollup-plugin-uglify";

import pkg from "./package.json";

const mergeAll = objs => Object.assign({}, ...objs);

const configBase = {
  input: "src/confetti.js",
  output: {
    exports: "default"
  },
  external: [
    ...Object.keys(pkg.dependencies || {}),
    ...Object.keys(pkg.peerDependencies || {})
  ],
  plugins: []
};

const umdConfig = mergeAll([
  configBase,
  {
    output: mergeAll([
      configBase.output,
      {
        file: pkg.main,
        format: "umd",
        name: "ConfettiGenerator"
      }
    ]),
    external: Object.keys(pkg.peerDependencies || {})
  }
]);

const devUmdConfig = mergeAll([
  umdConfig,
  {
    plugins: umdConfig.plugins.concat(
      replace({
        "process.env.NODE_ENV": JSON.stringify("development")
      })
    )
  }
]);

const prodUmdConfig = mergeAll([
  umdConfig,
  {
    output: mergeAll([
      umdConfig.output,
      { file: umdConfig.output.file.replace(/\.js$/, ".min.js") }
    ])
  },
  {
    plugins: umdConfig.plugins.concat(
      replace({
        "process.env.NODE_ENV": JSON.stringify("production")
      }),
      uglify({
        compress: {
          pure_getters: true,
          unsafe: true,
          unsafe_comps: true
        }
      })
    )
  }
]);

const webConfig = mergeAll([
  configBase,
  {
    output: [
      mergeAll([configBase.output, { file: pkg.module, format: "es" }]),
      mergeAll([configBase.output, { file: pkg.main, format: "cjs" }])
    ]
  }
]);

export default [devUmdConfig, prodUmdConfig, webConfig];