TypeScript Version: 2.0.6
Code
interface GenericIdentityFn {
<T>(arg: T): T;
}
function identity(n: number): string {
return n.toString();
}
let myIdentity: GenericIdentityFn = identity;Expected behavior:
The code should not compile because identity does not satisfy the constraints of GenericIdentityFn. Namely, it accepts an argument of type number and returns type string, whereas the interface GenericIdentityFn describes a function that accepts an argument of type T and returns type T.
Actual behavior:
The code compiles.
Other notes:
This is based on an example from https://www.typescriptlang.org/docs/handbook/generics.html.
TypeScript Version: 2.0.6
Code
Expected behavior:
The code should not compile because
identitydoes not satisfy the constraints ofGenericIdentityFn. Namely, it accepts an argument of typenumberand returns typestring, whereas the interfaceGenericIdentityFndescribes a function that accepts an argument of typeTand returns typeT.Actual behavior:
The code compiles.
Other notes:
This is based on an example from https://www.typescriptlang.org/docs/handbook/generics.html.