Method open

lib/internal/vfs/file_system.js:780–796

* Opens a file asynchronously. * @param {string} filePath The path to open * @param {string|Function} [flags] Open flags or callback * @param {number|Function} [mode] File mode or callback * @param {Function} [callback] Callback (err, fd)

(filePath, flags, mode, callback)

   * @param {Function} [callback] Callback (err, fd)
   */
  open(filePath, flags, mode, callback) {
    if (typeof flags === 'function') {
      callback = flags;
      flags = 'r';
      mode = undefined;
    } else if (typeof mode === 'function') {
      callback = mode;
      mode = undefined;
    }

    const providerPath = this.#toProviderPath(filePath);
    this[kProvider].open(providerPath, flags, mode)
      .then((handle) => {
        const fd = openVirtualFd(handle);
        callback(null, fd);
      }, (err) => callback(err));
  }

  /**
   * Closes a file descriptor asynchronously.