constructor(
    contents: $NestedFbtContentItems,
    errorListener: ?IFbtErrorListener,
  ) {
    this._contents = contents;
    this.__errorListener = errorListener;
    this._isSerializing = false;
    this._stringValue = null;
  }
(c) Meta Platforms, Inc. and affiliates. Confidential and proprietary.

This file is shared between www and fbsource and www is the source of truth.
When you make change to this file on www, please make sure you test it on
fbsource and send a diff to update the files too so that the 2 versions are
kept in sync.

Run the following command to sync the change from www to fbsource.
  js1 upgrade www-shared -p fbt --local ~/www

@flow
@format
@oncall i18n_fbt_js