The first step to create this utility is obviously declaring a new TypeScript type and giving it a name: 1 - Declaring a new type. printDog({ breed: "Airedale", age: 3}) Argument of type '{ breed . Use Union types allows you to define a variable as a string, or a number, or an array, or an object, etc. In TypeScript, the array is also considered a data type similar to string, number, etc. For example, I have a type A, and I need to get the type of b. The first type we passed to the generic is the type for . This blog post answers the following questions: . Create Custom Valueof Similar to Keyof to Return Union of Property ... This will allow you to create types that check specific string formats . Hi there. Problem Solution: Solution 1: declare your property in your service like below ( it is advised to use an interface instead of any, which we used here for a quick fix) products: any[] = []; Solution 2 (not recommended) : If you are a busy programmer and knows exactly what you are doing and wants to save . TypeScript knows that and supports accessing the cancelBubble property of the PointerEvent class within the function: In TypeScript 4.1 and onwards, you can re-map keys in mapped types with an as clause in a mapped type: type MappedTypeWithNewProperties<Type> = { [Properties in keyof Type as NewKeyType]: Type[Properties] } You can leverage features like template literal types to create new property names from prior ones: type Getters < Type > = { A Quick Glance on TypeScript Getter - EDUCBA function setActiveVideo(event): void { activeVideo = videos[event.target.value]; } However, attempting to access the property using its name, in the same way, will result in as error: Element implicitly has an 'any' type because expression of type 'any' can't be . TypeScript: Get type of a property. The operator keyof helps us to use correct property name where it is needed. my-app (tsconfig project) Setting the name property fixes the issue and the sample works as expected: Typeof Type Operator - Using the typeof operator to create new types.
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