isDefined
用于 Ref 的非空检查类型守卫。
用法
ts
import { isDefined } from '@vueuse/core'
const example = ref(Math.random() ? 'example' : undefined) // Ref<string | undefined>
if (isDefined(example))
example // Ref<string>Type Declarations
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>Source
Contributors
Anthony Fu
丶远方
Anthony Fu
James Garbutt
bjacobgordon-cy
Glen