assertInstanceOf | /testing/asserts.ts | std@0.209.0

Module

std/testing/asserts.ts>assertInstanceOf

Deno standard library

denoland/deno_std

assertNotStrictEquals

Spy

spy

Has

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

function assertInstanceOf

import { assertInstanceOf } from "https://deno.land/std@0.209.0/testing/asserts.ts";

assertInstanceOf<T extends AnyConstructor>(

actual: unknown,

expectedType: T,

msg?,

): asserts actual is GetConstructorType<T>

Make an assertion that obj is an instance of type. If not then throw.

Examples

Example 1

import { assertInstanceOf } from "https://deno.land/std@0.209.0/assert/assert_instance_of.ts";

assertInstanceOf(new Date(), Date); // Doesn't throw
assertInstanceOf(new Date(), Number); // Throws

Type Parameters

T extends AnyConstructor

Parameters

actual: unknown

expectedType: T

optional

msg = [UNSUPPORTED]

Returns

asserts actual is GetConstructorType<T>