Function join

lib/internal/fs/utils.js:229–250

(path, name)

const bufferSep = Buffer.from(pathModule.sep);

function join(path, name) {
  if ((typeof path === 'string' || isUint8Array(path)) &&
      name === undefined) {
    return path;
  }

  if (typeof path === 'string' && isUint8Array(name)) {
    const pathBuffer = Buffer.from(pathModule.join(path, pathModule.sep));
    return Buffer.concat([pathBuffer, name]);
  }

  if (typeof path === 'string' && typeof name === 'string') {
    return pathModule.join(path, name);
  }

  if (isUint8Array(path) && isUint8Array(name)) {
    return Buffer.concat([path, bufferSep, name]);
  }

  throw new ERR_INVALID_ARG_TYPE(
    'path', ['string', 'Buffer'], path);
}

function getDirents(path, { 0: names, 1: types }, callback) {
  let i;