rollup.config.js

import babel from "@rollup/plugin-babel";
import resolve from "@rollup/plugin-node-resolve";
import commonjs from "@rollup/plugin-commonjs";
import webWorkerLoader from "rollup-plugin-web-worker-loader";

import pkg from "./package.json";

const INPUT_FILE_PATH = "src/index.js";
const OUTPUT_NAME = "RectQrScanner";

const GLOBALS = {
  react: "React",
  "react-dom": "ReactDOM",
};

const PLUGINS = [
  babel({
    babelHelpers: "runtime",
    exclude: "node_modules/**",
  }),
  resolve({
    browser: true,
    resolveOnly: [/^(?!react$)/, /^(?!react-dom$)/],
  }),
  commonjs(),
];

const EXTERNAL = ["react", "react-dom"];

// https://github.com/rollup/plugins/tree/master/packages/babel#babelhelpers
const CJS_AND_ES_EXTERNALS = EXTERNAL.concat(/@babel\/runtime/);

const OUTPUT_DATA = [
  {
    file: pkg.browser,
    format: "umd",
  },
  {
    file: pkg.main,
    format: "cjs",
    exports: "default",
  },
  {
    file: pkg.module,
    format: "es",
  },
];

const config = OUTPUT_DATA.map(({ file, format, exports }) => ({
  input: INPUT_FILE_PATH,
  output: {
    file,
    format,
    exports,
    name: OUTPUT_NAME,
    globals: GLOBALS,
  },
  external: ["cjs", "es"].includes(format) ? CJS_AND_ES_EXTERNALS : EXTERNAL,
  plugins: [
    webWorkerLoader({
      targetPlatform: "browser",
      inline: true,
    }),
  ].concat(...PLUGINS),
}));

export default config;