How to use the @pixi/settings.settings.GC_MODE function in @pixi/settings

*/
        this.maxIdle = settings.GC_MAX_IDLE;

        /**
         * Maximum number of item to check
         * @member {number}
         * @see PIXI.settings.GC_MAX_CHECK_COUNT
         */
        this.checkCountMax = settings.GC_MAX_CHECK_COUNT;

        /**
         * Current garabage collection mode
         * @member {PIXI.GC_MODES}
         * @see PIXI.settings.GC_MODE
         */
        this.mode = settings.GC_MODE;
    }