How to use the @ptsecurity/mosaic/core.MultipleMode.KEYBOARD function in @ptsecurity/mosaic

constructor(
        private elementRef: ElementRef,
        differs: IterableDiffers,
        changeDetectorRef: ChangeDetectorRef,
        @Attribute('tabindex') tabIndex: string,
        @Attribute('multiple') multiple: string
    ) {
        super(differs, changeDetectorRef);

        this.tabIndex = parseInt(tabIndex) || 0;

        if (multiple === MultipleMode.CHECKBOX || multiple === MultipleMode.KEYBOARD) {
            this.multipleMode = multiple;
        } else if (multiple !== null) {
            this.multipleMode = MultipleMode.CHECKBOX;
        }

        if (this.multipleMode === MultipleMode.CHECKBOX) {
            this.autoSelect = false;
            this.noUnselectLast = false;
        }

        this.selectionModel = new SelectionModel(this.multiple);
    }

constructor(
        private element: ElementRef,
        private changeDetectorRef: ChangeDetectorRef,
        @Attribute('tabindex') tabIndex: string,
        @Attribute('auto-select') autoSelect: string,
        @Attribute('no-unselect') noUnselect: string,
        @Attribute('multiple') multiple: string
    ) {
        super();

        this.autoSelect = autoSelect === null ? true : toBoolean(autoSelect);
        this.noUnselect = noUnselect === null ? true : toBoolean(noUnselect);

        if (multiple === MultipleMode.CHECKBOX || multiple === MultipleMode.KEYBOARD) {
            this.multipleMode = multiple;
        } else if (multiple !== null) {
            this.multipleMode = MultipleMode.CHECKBOX;
        }

        this._tabIndex = parseInt(tabIndex) || 0;

        this.selectionModel = new SelectionModel(this.multiple);
    }