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import { isset } from 'topkat-utils'
import { newSystemCtx } from './ctx'
export const event = {
/**
* @param priority the higher the prior
*/
on<EventName extends keyof GDeventNames>(
eventName: EventName,
callback: (...params: GDeventNames[EventName]) => any,
priority = 50
) {
event.registeredEvents[eventName] ??= []
event.registeredEvents[eventName].push([priority, callback])
event.registeredEvents[eventName].sort(([priorityA], [priorityB]) => priorityA - priorityB)
},
/** unregister a callback from an event */
off<EventName extends keyof GDeventNames>(
eventName: EventName,
callback: (...params: GDeventNames[EventName]) => any,
) {
if (!isset(event.registeredEvents[eventName])) return
const eventIndex = event.registeredEvents[eventName].findIndex(([, callback2]) => callback === callback2)
if (eventIndex !== -1) {
event.registeredEvents[eventName].splice(eventIndex, 1)
return true
} else return false
},
/** asynchronous error catchable event
* will run all callbacks according to their priority
* @param {array} paramsValidationArray
* @returns {Object} metadata (will be passed as final argument of each event function to be modified by the different modules)
*/
async emit<EventName extends keyof GDeventNames>(
eventName: EventName,
...params: GDeventNames[EventName]
) {
// TODO try catch in all events and message like plz use try catch in your events handlers
const metadata = {}
event.registeredEvents[eventName] ??= []
for (const [, callback] of event.registeredEvents[eventName]) await callback(...params, metadata)
return metadata
},
/** SYNCHRONOUS
*/
emitSync<EventName extends keyof GDeventNames>(
eventName: EventName,
...params: GDeventNames[EventName]
) {
const metadata = {}
event.registeredEvents[eventName] ??= []
for (const [, callback] of event.registeredEvents[eventName]) callback(newSystemCtx(), ...params, metadata)
return metadata
},
registeredEvents: {} as { [EventName: string]: Array<[priority: number, callback: Function]> },
}
export default event // @deprecated default |