import { Emitter } from '@dcloudio/uni-runtime'
import { $Off, $On, $Once } from '../interface.uts'

const emitter = new Emitter()

export const $on = defineSyncApi<$On>('$on', (eventName, callback): number => {
    // TODO EventStopHandler
    return emitter.on(eventName, callback)
})

export const $off = defineSyncApi<$Off>('$off', (eventName, callback) => {
    emitter.off(eventName, callback)
})

export const $once = defineSyncApi<$Once>('$once', (eventName, callback): number => {
    return emitter.once(eventName, callback)
})

export function $emit(eventName: string, ...args: Array<any | null>): void {
    emitter.emit(eventName, ...args)
}