The 16.5.0 package released to unpkg currently has the production/profiling variant present for cjs builds but there is no equivalent for umd builds. 

i.e. There is the file https://unpkg.com/react@16.5.0/cjs/react.profiling.min.js but there is no https://unpkg.com/react@16.5.0/umd/react.profiling.min.js

It would be great if a future release had the profiling variant packaged as umd as well.

Also thanks for the awesome framework!
packageName
  );
  const rollupOutputOptions = getRollupOutputOptions(
    mainOutputPath,
    format,
    peerGlobals,
    bundle.global,
    bundleType
  );
  console.log(`${chalk.bgYellow.black(' BUILDING ')} ${logKey}`);
  try {
    const result = await rollup(rollupConfig);
    await result.write(rollupOutputOptions);
  } catch (error) {
    console.log(`${chalk.bgRed.black(' OH NOES! ')} ${logKey}\n`);
    handleRollupError(error);
    throw error;
  }
  for (let i = 0; i < otherOutputPaths.length; i++) {
    await asyncCopyTo(mainOutputPath, otherOutputPaths[i]);
  }
  console.log(`${chalk.bgGreen.black(' COMPLETE ')} ${logKey}\n`);
}
function handleRollupWarning(warning) {
  if (warning.code === 'UNUSED_EXTERNAL_IMPORT') {
    const match = warning.message.match(/external module '([^']+)'/);
    if (!match || typeof match[1] !== 'string') {
      throw new Error(
        'Could not parse a Rollup warning. ' + 'Fix this method.'
      );