Skip to main content
Home
Browse packagesDocs
Sign In with GitHubSign In with GitLab

@std/testing@0.215.0

latest
Works with
It is unknown whether this package works with Browsers, Deno, Node.js, Cloudflare Workers, Bun
It is unknown whether this package works with Browsers
It is unknown whether this package works with Deno
It is unknown whether this package works with Node.js
It is unknown whether this package works with Cloudflare Workers
It is unknown whether this package works with Bun
•JSR Score52%•
Published2 years ago (0.215.0)
function assertType
assertType<T extends true | false>(_expectTrue: T): void

Asserts at compile time that the provided type argument's type resolves to the expected boolean literal type.

Examples

Example 1

import { assertType, IsExact, IsNullable } from "@std/testing/types";

const result = "some result" as string | number;

// compile error if the type of `result` is not exactly `string | number`
assertType<IsExact<typeof result, string | number>>(true);

// causes a compile error that `true` is not assignable to `false`
assertType<IsNullable<string>>(true); // error: string is not nullable

Type Parameters

T extends true | false

Parameters

_expectTrue: T

Return Type

void

Report package

Please provide a reason for reporting this package. We will review your report and take appropriate action.

Please review the JSR usage policy before submitting a report.

Add Package

deno add jsr:@std/testing

Import symbol

import { assertType } from "@std/testing/types";
or

Import directly with a jsr specifier

import { assertType } from "jsr:@std/testing/types";