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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 | 2x 2x 2x 2x 2x 2x 8x 8x 8x 8x 8x 8x 8x 8x 8x 7x 1x 8x 1x 8x 7x 7x 7x 7x 7x 7x 8x 8x 8x 7x 7x 8x 8x | import { type ShallowRef, readonly, shallowRef } from '@vue/reactivity'
import { getCurrentInstance } from '../component'
import { warn } from '../warning'
import { EMPTY_OBJ } from '@vue/shared'
export const knownTemplateRefs: WeakSet<ShallowRef> = new WeakSet()
export function useTemplateRef<T = unknown, Keys extends string = string>(
key: Keys,
): Readonly<ShallowRef<T | null>> {
const i = getCurrentInstance()
const r = shallowRef(null)
if (i) {
const refs = i.refs === EMPTY_OBJ ? (i.refs = {}) : i.refs
let desc: PropertyDescriptor | undefined
if (
__DEV__ &&
(desc = Object.getOwnPropertyDescriptor(refs, key)) &&
!desc.configurable
) {
warn(`useTemplateRef('${key}') already exists.`)
} else {
Object.defineProperty(refs, key, {
enumerable: true,
get: () => r.value,
set: val => (r.value = val),
})
}
} else if (__DEV__) {
warn(
`useTemplateRef() is called when there is no active component ` +
`instance to be associated with.`,
)
}
const ret = __DEV__ ? readonly(r) : r
if (__DEV__) {
knownTemplateRefs.add(ret)
}
return ret
}
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