API Reference > imodeljs-frontend > QuantityFormatting > QuantityTypeDefinition QuantityTypeDefinition Interface Beta Definition of a standard QuantityType that is registered with the QuantityFormatter. Methods Name Description generateFormatterSpec(formatProps: FormatProps, unitsProvider: UnitsProvider): Promise<FormatterSpec> Generate a [FormatterSpec]$(imodeljs-quantity) that will be called to format values. generateParserSpec(formatProps: FormatProps, unitsProvider: UnitsProvider): Promise<ParserSpec> Generate a [ParserSpec]$(imodeljs-quantity) that will be called to parse a string into a quantity value. getDefaultFormatPropsBySystem(requestedSystem: UnitSystemKey): FormatProps Properties Name Type Description description string Localized description that may be used to provide detailed description for the Quantity type. key Readonly string String used as a key to look up the quantity type. label string Localized label to display in UI persistenceUnit Readonly UnitProps The unit that the magnitude of the quantity is stored ie. type Readonly QuantityTypeArg The type value which can be one of the standard QuantityType enum values or a unique string if defining a custom type. Defined in core/frontend/src/quantity-formatting/QuantityFormatter.ts Line 115 Last Updated: 29 November, 2022