TypeScript: fs.readDir recursive implementation

file.utils.ts

/* 
* Walks a directory (fs.readdir but recursively)
* Context:
* - fs does not have support for walk/readdir recursively
* - fs-extra moved "walk" functionality to https://github.com/jprichardson/node-klaw
*/

export const listDirectory = async (
  currentPath: string,
  includeDirectories = false,
  ignorePaths: Array<string> = ['.DS_Store'],
): Promise<string[]> => {
  const dirsAndFiles = fs
    .readdirSync(currentPath)
    .filter((f) => !ignorePaths.includes(f));
  const directories = dirsAndFiles.filter((f) =>
    fs.lstatSync(path.join(currentPath, f)).isDirectory(),
  );
  const result = dirsAndFiles
    .filter((f) => includeDirectories || !directories.includes(f))
    .map((f) => path.join(currentPath, f));

  const subResults = await Promise.all(
    directories.map(async (dir) => {
      const joinedPath = path.join(currentPath, dir);
      return listDirectory(joinedPath, includeDirectories);
    }),
  );
  result.push(...subResults.flatMap((s) => s));
  return result;
};