isNone | /src/option.ts | ahh@v0.13.0

The Deno 2 Release Candidate is here

Opinionated idiomatic features for TypeScript.

function isNone

import { isNone } from "https://deno.land/x/ahh@v0.13.0/src/option.ts";

isNone<T>(option: Option<T>): option is None

Returns whether option is a None value.

Examples

Example 1

import { assert } from "../test_deps.ts";
import O from "./option.ts";

assert(O.isNone(undefined));
assert(O.isNone(null));