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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 { tryOnScopeDispose } from '@vueuse/core'
export type EventHookOn<T = any> = (fn: (param: T) => void) => { off: () => void }
export type EventHookOff<T = any> = (fn: (param: T) => void) => void
export type EventHookTrigger<T = any> = (param: T) => void
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: Array<(param: T) => void> = []
const off = (fn: (param: T) => void) => {
const index = fns.indexOf(fn)
if (index !== -1)
fns.splice(index, 1)
}
const on = (fn: (param: T) => void) => {
fns.push(fn)
tryOnScopeDispose(() => {
off(fn)
})
return {
off: () => off(fn),
}
}
const trigger = (param: T) => {
fns.forEach(fn => fn(param))
}
return {
on,
off,
trigger,
}
}