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@std/assert@1.0.13
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denoland/std

Common assertion functions, especially useful for testing

This package works with Cloudflare Workers, Node.js, Deno, Bun, Browsers
This package works with Cloudflare Workers
This package works with Node.js
This package works with Deno
This package works with Bun
This package works with Browsers
JSR Score
100%
Published
3 days ago (1.0.13)
function assert
assert(
expr: unknown,
msg?: string,
): asserts expr

Make an assertion, error will be thrown if expr does not have truthy value.

Examples

Usage

import { assert } from "@std/assert";

assert("hello".includes("ello")); // Doesn't throw
assert("hello".includes("world")); // Throws

Parameters

expr: unknown

The expression to test.

optional
msg: string =

The optional message to display if the assertion fails.

Return Type

asserts expr

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Add Package

deno add jsr:@std/assert

Import symbol

import { assert } from "@std/assert/assert";
or

Import directly with a jsr specifier

import { assert } from "jsr:@std/assert/assert";

Add Package

pnpm i jsr:@std/assert
or (using pnpm 10.8 or older)
pnpm dlx jsr add @std/assert

Import symbol

import { assert } from "@std/assert/assert";

Add Package

yarn add jsr:@std/assert
or (using Yarn 4.8 or older)
yarn dlx jsr add @std/assert

Import symbol

import { assert } from "@std/assert/assert";

Add Package

npx jsr add @std/assert

Import symbol

import { assert } from "@std/assert/assert";

Add Package

bunx jsr add @std/assert

Import symbol

import { assert } from "@std/assert/assert";