Typescript: Generic Type being inferred to Literal Type

Question

Having an issue where " f<T>(val:T) {}; f(5); " is causing T to be a Literal Type of 5 instead of Number. Can I specify that I do not want a literal type here, as I want T to be a number (or any non literal) in this case?

Answer 1

extends number will do that for you, but also will block any number types

let f1 = <T extends number>(val: T) => val;
let result1 = f1(5); // 5
let result2 = f1(true) // Error

But adding map number into 5 will works for any type

let f2 = <T>(val: T) => val;
let result1 = f2(5 as 5) // 5