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@std/testing@1.0.16
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denoland/std

Tools for testing Deno code like snapshot testing, bdd testing, and time mocking

This package works with Deno
This package works with Deno
JSR Score
94%
Published
3 months ago (1.0.16)

Testing utilities for types.

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

Functions

f
assertType

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

Type Aliases

T
Assert

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

T
AssertFalse

Asserts at compile time that the provided type argument's type resolves to false.

T
AssertTrue

Asserts at compile time that the provided type argument's type resolves to true.

T
Has

Checks if type T has the specified type U.

T
IsAny

Checks if type T is the any type.

T
IsExact

Checks if type T exactly matches type U.

T
IsNever

Checks if type T is the never type.

T
IsNullable

Checks if type T is possibly null or undefined.

T
IsUnknown

Checks if type T is the unknown type.

T
NotHas

Checks if type T does not have the specified type U.

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Add Package

deno add jsr:@std/testing

Import symbol

import * as mod from "@std/testing/types";
or

Import directly with a jsr specifier

import * as mod from "jsr:@std/testing/types";