WP_Theme_JSON_Resolver::get_user_global_styles_post_id() WordPress Method

	public static function get_user_global_styles_post_id() {
		if ( null !== static::$user_custom_post_type_id ) {
			return static::$user_custom_post_type_id;
		}

		$user_cpt = static::get_user_data_from_wp_global_styles( wp_get_theme(), true );

		if ( array_key_exists( 'ID', $user_cpt ) ) {
			static::$user_custom_post_type_id = $user_cpt['ID'];
		}

		return static::$user_custom_post_type_id;
	}