Function buildCjsBundle

test/cjs.test.js:31–56

* Transpile every `.js` file under `src/` to CommonJS in `outDir`, copy * non-JS assets, then drop the `dist/cjs/package.json` type marker and * the same `module.exports = exports.default` post-build append the * `build:cjs` npm script writes. The test then `require()`s the result. * @param {str

(outDir)

 * @param {string} outDir target directory
 */
async function buildCjsBundle(outDir) {
  for (const entry of readdirSync(srcDir, { withFileTypes: true })) {
    const source = path.join(srcDir, entry.name);
    const target = path.join(outDir, entry.name);

    if (entry.name.endsWith(".js")) {
      const result = await transformFileAsync(source, { envName: "cjs" });

      writeFileSync(target, result.code);
    } else {
      copyFileSync(source, target);
    }
  }

  writeFileSync(
    path.join(outDir, "package.json"),
    `${JSON.stringify({ type: "commonjs" })}\n`,
  );

  const indexPath = path.join(outDir, "index.js");

  writeFileSync(
    indexPath,
    `${readFileSync(indexPath, "utf8")}module.exports = exports.default;\nmodule.exports.default = exports.default;\n`,
  );
}

describe("cjs", () => {
  let cjsDir;