Question

Is there a TypeScript equivalent of C#’s Func keyword?

On a preliminary exploration of TypeScript today converting some existing code, I used interface for classes/objects but found myself duplicating function types unnecessarily. Am I missing something?

In the following I’ve defined an interface for an object type (Data) and would benefit from naming (data: Data) => void too

interface Funcs {
    box: (data: Data) => void;
    lbl: (data: Data) => void;
}

Thanks!

Answer 1

A function type (args) => t is just an abbreviation for the object type {(args): t}, so the following should work:

interface Func {
  (data: Data): void;
}

interface Funcs {
  box: Func;
  lbl: Func;
}