VitestassertType
- Type:
<T>(value: T): void
You can use this function as an alternative for expectTypeOf to easily assert that the argument type is equal to the generic provided.
ts
import { assertType } from 'vitest'
function concat(a: string, b: string): string
function concat(a: number, b: number): number
function concat(a: string | number, b: string | number): string | number
assertType<string>(concat('a', 'b'))
assertType<number>(concat(1, 2))
// @ts-expect-error wrong types
assertType(concat('a', 2))import { assertType } from 'vitest'
function concat(a: string, b: string): string
function concat(a: number, b: number): number
function concat(a: string | number, b: string | number): string | number
assertType<string>(concat('a', 'b'))
assertType<number>(concat(1, 2))
// @ts-expect-error wrong types
assertType(concat('a', 2))