@std/assert@1.0.19
Built and signed on GitHub Actions
Built and signed on GitHub Actions

latest

Works with

License

MIT

•

Downloads7,543/wk

•

Published2 months ago (1.0.19)

Common assertion functions, especially useful for testing

function assertFalse

assertFalse(expr: unknown,
msg?: string
): asserts expr is Falsy

Make an assertion, an error will be thrown if expr has a truthy value.

Examples

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

assertFalse(false); // Doesn't throw
assertFalse(true); // Throws

expr: unknown

The expression to test.

optional

msg: string =

The optional message to display if the assertion fails.

asserts expr is Falsy

AssertionError

If expr is truthy.

Add Package

deno add jsr:@std/assert

Import symbol

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

Import directly with a jsr specifier

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