Method sync

src/backend/Dropbox.ts:319–332

(cb: BFSOneArgCallback)

  }

  public sync(cb: BFSOneArgCallback): void {
    if (this.isDirty()) {
      const buffer = this.getBuffer(),
        arrayBuffer = buffer2ArrayBuffer(buffer);
      this._fs._writeFileStrict(this.getPath(), arrayBuffer, (e?: ApiError) => {
        if (!e) {
          this.resetDirty();
        }
        cb(e);
      });
    } else {
      cb();
    }
  }

  public close(cb: BFSOneArgCallback): void {
    this.sync(cb);