type.maybe(Type)

Given a type, returns a TypeObject that will check values against against that type. Throws if the value is not of the provided type or null or undefined.

import { Reflect, type } from "can/everything";

let val = Reflect.convert(42, type.maybe(Number));
console.log(val); // -> 42

val = Reflect.convert(null, type.maybe(Number));
console.log(val); // -> null

val = Reflect.convert(undefined, type.maybe(Number));
console.log(val); // -> undefined

Reflect.convert("42", type.maybe(Number));
// throws for providing an invalid type.