jails-js/src/utils/pubsub.ts

Jails - Elegant and Minimalistic Javascript Application Library

const topics: any = {}
const _async: any = {}

export const publish = (name, params) => {

	_async[name] = isObject(params)? Object.assign({}, _async[name], params): params

	if (topics[name]) {
		topics[name].forEach(topic => topic(params))
	}
}

export const subscribe = (name, method) => {
	topics[name] = topics[name] || []
	topics[name].push(method)
	if (name in _async) {
		method(_async[name])
	}
	return () => {
		topics[name] = topics[name].filter( fn => fn != method )
	}
}

const isObject = (value) => {
	return (typeof value === 'object' && value !== null && !Array.isArray(value))
}