assertExists | /assert/assert_exists.ts | std@0.222.0

Module

std/assert/assert_exists.ts>assertExists

The Deno Standard Library

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The Standard Library has been moved to JSR. See the blog post for details.

function assertExists

import { assertExists } from "https://deno.land/std@0.222.0/assert/assert_exists.ts";

assertExists<T>(actual: T, msg?: string): asserts actual is NonNullable<T>

Make an assertion that actual is not null or undefined. If not then throw.

Examples

Example 1

import { assertExists } from "https://deno.land/std@0.222.0/assert/assert_exists.ts";

assertExists("something"); // Doesn't throw
assertExists(undefined); // Throws

Type Parameters

Parameters

actual: T

optional

msg: string

Returns

asserts actual is NonNullable<T>