Method empty

src/generic/key_value_filesystem.ts:742–749

* Delete all contents stored in the file system.

(cb: BFSOneArgCallback)

   * Delete all contents stored in the file system.
   */
  public empty(cb: BFSOneArgCallback): void {
    this.store.clear((e?) => {
      if (noError(e, cb)) {
        // INVARIANT: Root always exists.
        this.makeRootDirectory(cb);
      }
    });
  }

  public rename(oldPath: string, newPath: string, cb: BFSOneArgCallback): void {
    const tx = this.store.beginTransaction('readwrite');