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index.ts
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index.ts
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/**
* The source code for this function was inspired by vue-apollo's `useEventHook` util
* https://github.com/vuejs/vue-apollo/blob/v4/packages/vue-apollo-composable/src/util/useEventHook.ts
*/
import type { IsAny } from '../utils/types'
import { tryOnScopeDispose } from '../tryOnScopeDispose'
// any extends void = true
// so we need to check if T is any first
type Callback<T> = IsAny<T> extends true
? (param: any) => void
: (
[T] extends [void]
? () => void
: (param: T) => void
)
export type EventHookOn<T = any> = (fn: Callback<T>) => { off: () => void }
export type EventHookOff<T = any> = (fn: Callback<T>) => void
export type EventHookTrigger<T = any> = (param?: T) => Promise<unknown[]>
export interface EventHook<T = any> {
on: EventHookOn<T>
off: EventHookOff<T>
trigger: EventHookTrigger<T>
}
/**
* Utility for creating event hooks
*
* @see https://vueuse.org/createEventHook
*/
export function createEventHook<T = any>(): EventHook<T> {
const fns: Set<Callback<T>> = new Set()
const off = (fn: Callback<T>) => {
fns.delete(fn)
}
const on = (fn: Callback<T>) => {
fns.add(fn)
const offFn = () => off(fn)
tryOnScopeDispose(offFn)
return {
off: offFn,
}
}
const trigger: EventHookTrigger<T> = (...args) => {
return Promise.all(Array.from(fns).map(fn => fn(...(args as [T]))))
}
return {
on,
off,
trigger,
}
}