native.js
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	import { microSeconds as micro, isNode } from '../util';
	export var microSeconds = micro;
	export var type = 'native';
	export function create(channelName) {
	var state = {
	messagesCallback: null,
	bc: new BroadcastChannel(channelName),
	subFns: [] // subscriberFunctions

	};

	state.bc.onmessage = function (msg) {
	if (state.messagesCallback) {
	state.messagesCallback(msg.data);
	}
	};

	return state;
	}
	export function close(channelState) {
	channelState.bc.close();
	channelState.subFns = [];
	}
	export function postMessage(channelState, messageJson) {
	try {
	channelState.bc.postMessage(messageJson, false);
	return Promise.resolve();
	} catch (err) {
	return Promise.reject(err);
	}
	}
	export function onMessage(channelState, fn) {
	channelState.messagesCallback = fn;
	}
	export function canBeUsed() {
	/**
	* in the electron-renderer, isNode will be true even if we are in browser-context
	* so we also check if window is undefined
	*/
	if (isNode && typeof window === 'undefined') return false;

	if (typeof BroadcastChannel === 'function') {
	if (BroadcastChannel._pubkey) {
	throw new Error('BroadcastChannel: Do not overwrite window.BroadcastChannel with this module, this is not a polyfill');
	}

	return true;
	} else return false;
	}
	export function averageResponseTime() {
	return 150;
	}
	export default {
	create: create,
	close: close,
	onMessage: onMessage,
	postMessage: postMessage,
	canBeUsed: canBeUsed,
	type: type,
	averageResponseTime: averageResponseTime,
	microSeconds: microSeconds
	};