unwrapErr

function ResultAsync.unwrapErr(
    result: AwaitableResult<T, E>
): Promise<E>

Unwraps the Err value from the result. If the result is an Ok, throws a ResultError with a default message.

Example

data-first

await ResultAsync.unwrapErr(err("fail"));
// "fail"

await ResultAsync.unwrapErr(ok(5));
// throws ResultError("Called Ok.unwrapErr()")

data-last

await pipe(err("fail"), ResultAsync.unwrapErr());
// "fail"