isDefined

Category

Utilities

Export Size

103 B

Last Changed

last week

Non-nullish checking type guard for Ref.

Usage

import { isDefined } from '@vueuse/core'

const example = ref(Math.random() ? 'example' : undefined) // Ref<string | undefined>

if (isDefined(example))
  example // Ref<string>

Type Declarations

export type IsDefinedReturn = boolean
export declare function isDefined<T>(
  v: ComputedRef<T>,
): v is ComputedRef<Exclude<T, null | undefined>>
export declare function isDefined<T>(
  v: Ref<T>,
): v is Ref<Exclude<T, null | undefined>>
export declare function isDefined<T>(v: T): v is Exclude<T, null | undefined>

Source

Source • Docs

Contributors

Anthony Fu

Anthony Fu

Robin

James Garbutt

bjacobgordon-cy

Glen

Changelog

v13.1.0 on 4/8/2025

c1d6e - feat(shared): ensure return types exists (#4659)

v12.0.0-beta.1 on 11/21/2024

0a9ed - feat!: drop Vue 2 support, optimize bundles and clean up (#4349)

v11.0.0-beta.3 on 8/14/2024

fd884 - fix: moves most specific overload to the top (#4141)