Function open

lib/internal/fs/promises.js:1351–1365

(path, flags, mode)

// Note that unlike fs.open() which uses numeric file descriptors,
// fsPromises.open() uses the fs.FileHandle class.
async function open(path, flags, mode) {
  const h = vfsState.handlers;
  if (h !== null) {
    const result = h.promisesOpen(path, flags, mode);
    if (result !== undefined) return result;
  }
  path = getValidatedPath(path);
  const flagsNumber = stringToFlags(flags);
  mode = parseFileMode(mode, 'mode', 0o666);
  return new FileHandle(await PromisePrototypeThen(
    binding.openFileHandle(path, flagsNumber, mode, kUsePromises),
    undefined,
    handleErrorFromBinding,
  ));
}

async function read(handle, bufferOrParams, offset, length, position) {
  let buffer = bufferOrParams;