If I have an api that looks like this:
const execute = (func) => {
return func();
};
how can I ensure that the function always returns a value? The only solution that comes to mind is:
type Func = () => !never;
const execute = (func: Func) => func();
however, !never does not exist.
The element that should be excluded is void, which represents the return type of a function that does not return any value.
(never essentially indicates that the function throws an error, and this cannot be excluded)
type voidIsUndefined = void extends undefined ? true : false; // false
type undefinedIsVoid = undefined extends void ? true : false; // true
function doNotAllowVoid<T>(fn: void extends T ? never : (() => T)): T {
return fn()
}
doNotAllowVoid(() => {}) // error
doNotAllowVoid(() => {
return;
}) // error, unable to resolve
doNotAllowVoid(() => undefined)
doNotAllowVoid(() => 123)
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