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This is useful because there is no way to\n   * synchronously read the value because it might be driven natively.\n   *\n   * See https://reactnative.dev/docs/animatedvalue.html#addlistener\n   */\n\n\n  addListener(callback) {\n    var id = String(_uniqueId++);\n    this._listeners[id] = callback;\n\n    if (this.__isNative) {\n      this._startListeningToNativeValueUpdates();\n    }\n\n    return id;\n  }\n  /**\n   * Unregister a listener. 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