@toruslabs/broadcast-channel/dist/lib.cjs/methods/simulate.js

A BroadcastChannel that works in New Browsers, Old Browsers, WebWorkers

'use strict';

var util = require('../util.js');

const microSeconds = util.microSeconds;
const type = "simulate";
const SIMULATE_CHANNELS = new Set();
const SIMULATE_DELAY_TIME = 5;
function create(channelName) {
  const state = {
    time: util.microSeconds(),
    name: channelName,
    messagesCallback: null
  };
  SIMULATE_CHANNELS.add(state);
  return state;
}
function close(channelState) {
  SIMULATE_CHANNELS.delete(channelState);
}
function postMessage(channelState, messageJson) {
  return new Promise(resolve => {
    setTimeout(() => {
      const channelArray = Array.from(SIMULATE_CHANNELS);
      channelArray.forEach(channel => {
        if (channel.name === channelState.name &&
        // has same name
        channel !== channelState &&
        // not own channel
        !!channel.messagesCallback &&
        // has subscribers
        channel.time < messageJson.time // channel not created after postMessage() call
        ) {
          channel.messagesCallback(messageJson);
        }
      });
      resolve();
    }, SIMULATE_DELAY_TIME);
  });
}
function onMessage(channelState, fn) {
  channelState.messagesCallback = fn;
}
function canBeUsed() {
  return true;
}
function averageResponseTime() {
  return SIMULATE_DELAY_TIME;
}

exports.SIMULATE_DELAY_TIME = SIMULATE_DELAY_TIME;
exports.averageResponseTime = averageResponseTime;
exports.canBeUsed = canBeUsed;
exports.close = close;
exports.create = create;
exports.microSeconds = microSeconds;
exports.onMessage = onMessage;
exports.postMessage = postMessage;
exports.type = type;