Class DropboxFileSystem

src/backend/Dropbox.ts:354–666

 * NOTE: You must use the v0.10 version of the [Dropbox JavaScript SDK](https://www.npmjs.com/package/dropbox).
 */
export default class DropboxFileSystem extends BaseFileSystem implements FileSystem {
  public static readonly Name = "Dropbox";

  public static readonly Options: FileSystemOptions = {
    client: {
      type: "object",
      description: "An *authenticated* Dropbox client. Must be from the 0.10 JS SDK.",
      validator: (opt: Dropbox.Client, cb: BFSOneArgCallback): void => {
        if (opt.isAuthenticated && opt.isAuthenticated()) {
          cb();
        } else {
          cb(new ApiError(ErrorCode.EINVAL, `'client' option must be an authenticated Dropbox client from the v0.10 JS SDK.`));
        }
      }
    }
  };

  /**
   * Creates a new DropboxFileSystem instance with the given options.
   * Must be given an *authenticated* DropboxJS client from the old v0.10 version of the Dropbox JS SDK.
   */
  public static Create(opts: DropboxFileSystemOptions, cb: BFSCallback<DropboxFileSystem>): void {
    cb(null, new DropboxFileSystem(opts.client, false));
  }

  public static isAvailable(): boolean {
    // Checks if the Dropbox library is loaded.
    return typeof Dropbox !== 'undefined';
  }

  // The Dropbox client.
  private _client: CachedDropboxClient;

  /**
   * **Deprecated. Please use Dropbox.Create() method instead.**
   *
   * Constructs a Dropbox-backed file system using the *authenticated* DropboxJS client.
   *
   * Note that you must use the old v0.10 version of the Dropbox JavaScript SDK.
   */
  constructor(client: Dropbox.Client, deprecateMsg = true) {
    super();
    this._client = new CachedDropboxClient(client);
    deprecationMessage(deprecateMsg, DropboxFileSystem.Name, { client: "authenticated dropbox client instance" });
    constructErrorCodeLookup();
  }

  public getName(): string {
    return DropboxFileSystem.Name;
  }

  public isReadOnly(): boolean {
    return false;
  }

  // Dropbox doesn't support symlinks, properties, or synchronous calls

  public supportsSymlinks(): boolean {