API Reference > imodeljs-frontend > QuantityFormatting > isCheckboxFormatPropEditorSpec isCheckboxFormatPropEditorSpec Function Beta CheckboxFormatPropEditorSpec type guard. isCheckboxFormatPropEditorSpec(item: CustomFormatPropEditorSpec): item is CheckboxFormatPropEditorSpec Parameter Type Description item CustomFormatPropEditorSpec Returns - item is CheckboxFormatPropEditorSpec Defined in core/frontend/src/quantity-formatting/QuantityFormatter.ts Line 75 Last Updated: 29 November, 2022