import { isUnwrapOptionalOf } from "https://deno.land/x/unknownutil@v3.18.1/is.ts";
Return an Optional
un-annotated type predicate function that returns true
if the type of x
is T
.
To enhance performance, users are advised to cache the return value of this function and mitigate the creation cost.
import { is } from "@core/unknownutil";
const isMyType = is.UnwrapOptionalOf(is.OptionalOf(is.String));
const a: unknown = "a";
if (isMyType(a)) {
// a is narrowed to string
const _: string = a;
}
Type Parameters
P extends Predicate<unknown>
Parameters
pred: P