isDefined

Ref 的非无效检查类型保护。

¥Non-nullish checking type guard for Ref.

用法

¥Usage

import { isDefined } from '@vueuse/core'

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

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

类型声明

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>

源代码

源代码 • 文档

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