test-repo/scripts/tools/bundle-test/index.js

import { createRequire } from "node:module";
import path from "node:path";
import url from "node:url";
import webpack from "webpack";
import packageConfig from "../../build/config.js";

function runWebpack(config) {
  return new Promise((resolve, reject) => {
    webpack(config, (error, stats) => {
      if (error) {
        reject(error);
        return;
      }

      if (stats.hasErrors()) {
        const { errors } = stats.toJson();
        const error = new Error(errors[0].message);
        error.errors = errors;
        reject(error);
        return;
      }

      resolve(stats);
    });
  });
}

const TEMPORARY_DIRECTORY = url.fileURLToPath(
  new URL("./.tmp", import.meta.url),
);

const { distDirectory, files } = packageConfig;
/* `require` in `parser-typescript.js`, #12338 */
for (const file of files) {
  if (file.platform !== "universal") {
    continue;
  }
  console.log(`${file.output.file}: `);

  const stats = await runWebpack({
    mode: "production",
    entry: path.join(distDirectory, file.output.file),
    output: {
      path: TEMPORARY_DIRECTORY,
      filename: `${file.output.file}.[contenthash:7].${
        file.output.format === "esm" ? "mjs" : "cjs"
      }`,
    },
    performance: { hints: false },
    optimization: { minimize: false },
  });
  const result = stats.toJson();
  const { warnings, assets } = result;

  if (warnings.length > 0) {
    console.log(warnings);
    throw new Error("Unexpected webpack warning.");
  }

  if (assets.length > 1) {
    console.log(assets);
    throw new Error("Unexpected assets.");
  }

  const outputFileName = assets[0].name;
  const outputFile = path.join(TEMPORARY_DIRECTORY, outputFileName);
  const require = createRequire(import.meta.url);

  try {
    if (file.output.format !== "esm") {
      require(outputFile);
    } else {
      await import(url.pathToFileURL(outputFile));
    }
  } catch (error) {
    console.log(`'${outputFileName}' is not functional.`);
    throw error;
  }

  console.log("  Passed.");
}