isDefined

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導出大小

103 B

最後更改

4 個月前

Ref 的非空值檢查類型守衛。

用法

import { isDefined } from '@vueuse/core'

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

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

類型宣告

typescript

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>