table-filter-multiselect/src/lib/eventStack/eventStack.js

## Install You need to have react and react-dom as dependencies in your project.

import EventTarget from './eventTarget'
import normalizeTarget from './normalizeTarget'

class EventStack {
	constructor() {
		this._targets = new Map()
	}

	// ------------------------------------
	// Target utils
	// ------------------------------------

	_find(target, autoCreate = true){
		const normalized = normalizeTarget(target)

		if (this._targets.has(normalized)) return this._targets.get(normalized)
		if (!autoCreate) return

		const eventTarget = new EventTarget(normalized)
		this._targets.set(normalized, eventTarget)

		return eventTarget
	}

	_remove(target){
		const normalized = normalizeTarget(target)

		this._targets.delete(normalized)
	}

	sub(name, handlers, options = {}){

		const { target = document, pool = 'default' } = options
		const eventTarget = this._find(target)

		eventTarget.sub(name, handlers, pool)
	}

	unsub(name, handlers, options = {}){

		const { target = document, pool = 'default' } = options
		const eventTarget = this._find(target, false)

		if (eventTarget) {
			eventTarget.unsub(name, handlers, pool)
			if (eventTarget.empty()) this._remove(target)
		}
	}
}

const instance = new EventStack()

export default instance