TypeScript rationalizes undefined returning functions InfoWorld
With easier implicit returns for undefined returning functions TypeScript 5 1 now allows undefined returning functions to have no return
Function return type inferrence expecting undefined may refine , I would expect TypeScript to type impl method1 as Promise undefined and impl method2 as undefined based on the expected type
Creating an Undefined Return Type Signature in Typescript
We are creating a function that normally returns a string value but it could return undefined and we want to let our API users know that the undefined
Handbook Functions TypeScript, Functions are the fundamental building block of any application in JavaScript They re how you build up layers of abstraction mimicking classes
Documentation TypeScript 2 0
Documentation TypeScript 2 0, A property access or a function call produces a compile time error if the object or function is of a type that includes null or undefined However type guards
Handle Exceptions Using Try catch finally In TypeScript Delft Stack
Type definition for function that could return undefined r typescript
Type definition for function that could return undefined r typescript I doubt it s possible undefined just means there s no value assigned to this variable I don t think you can treat undefined as it s own
Typescript Function Inside Object Loses Type Safety On Return Value
If you instead declare it as property string undefined then you have to declare and assign a value or undefined to it when you Why isn t string allowed as a function return value in TypeScript . This wouldn t be a breaking change in existing TypeScript JavaScript code How to allow a function return type undefined Stack Overflow For all other functions the default return value is undefined Documentation Although this behavior is described in the documentation many novice developers
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