Basic glob function

glob.js

const partition = (func, array) => array.reduce(([pass, nopass], item) => {
  if (func(item)) {
    return [[...pass, item], nopass]
  }
  return [pass, [...nopass, item]]
}, [[], []]);


const glob = async (path, regex) => {
  const dirContent = await fsp.readdir(path, {withFileTypes: true})
  const [folders, files] = partition(file => file.isDirectory(), dirContent)

  const matchingFiles = files.reduce((all, file) => {
    if (!regex.test(file.name)) {
      return all;
    }
    const filePath = path ? join(path, file.name) : file.name;
    return [...all, filePath];
  }, []);

  const rest = await folders.reduce(async (all, folder) => {
    const previous = await all;
    const folderPath = join(path, folder.name);
    const globbed = await glob(folderPath, regex);
    return [...previous, ...globbed];
  }, []);

  return [...matchingFiles, ...rest]
};