File walker for Node

example.js

const ignoredExtensions = ['tsx', 'mdx'];
const ignoredDirectories = ['components', 'assets', 'hooks'];

export async function getStaticProps() {
  const routes = await walkFiles(
    path.resolve(process.cwd(), 'src/pages'),
    ({ filePath, files, name, extension, isDirectory, children }) => {
      const slug = `${path.dirname(filePath)}/${name}`.split('pages')[1];
      const containsIndex = files.some((file) => file.name.startsWith('index'));
      const isIndexFile = name === 'index';
      const isPrivateFile = name[0] === '_';
      const isIgnoredFile =
        !isDirectory && !ignoredExtensions.includes(extension);
      const isIgnoredDirectory =
        isDirectory && !containsIndex && ignoredDirectories.includes(name);

      if (isIndexFile || isPrivateFile || isIgnoredFile || isIgnoredDirectory) {
        return null;
      }

      return {
        name,
        slug,
        children,
      };
    }
  );
  return { props: { routes } };
}

walkFiles.js

async function walkFiles(filePath, format, isDirectory = null) {
  const extension = path.extname(filePath).slice(1);
  const name = path.basename(filePath, `.${extension}`);
  let children = [];
  if (isDirectory !== false) {
    const files = await fs.readdir(filePath, { withFileTypes: true });
    children = await Promise.all(
      files.map((file) =>
        walkFiles(`${filePath}/${file.name}`, format, file.isDirectory())
      )
    );
    children = children.filter(Boolean);
  }
  if (isDirectory === null) {
    return children;
  }
  return format({
    name,
    filePath,
    extension: extension === '' ? null : extension,
    isDirectory,
    children,
  });
}