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	 * @return bool True if the block type is registered, false otherwise.
	 */
	public function is_registered( $name ) {
		return isset( $this->registered_block_types[ $name ] );
	}

	public function __wakeup() {
		if ( ! $this->registered_block_types ) {
			return;
		}
		if ( ! is_array( $this->registered_block_types ) ) {
			throw new UnexpectedValueException();
		}
		foreach ( $this->registered_block_types as $value ) {
			if ( ! $value instanceof WP_Block_Type ) {
				throw new UnexpectedValueException();
			}
		}
	}

	/**
	 * Utility method to retrieve the main instance of the class.
	 *
	 * The instance will be created if it does not exist yet.
	 *
	 * @since 5.0.0
	 *
	 * @return WP_Block_Type_Registry The main instance.
	 */
	public static function get_instance() {
		if ( null === self::$instance ) {
			self::$instance = new self();
		}

		return self::$instance;
	}
}