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

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

'use strict';

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

const microSeconds = util.microSeconds;
const type = "native";
function create(channelName) {
  const state = {
    time: util.microSeconds(),
    messagesCallback: null,
    bc: new BroadcastChannel(channelName),
    subFns: [] // subscriberFunctions
  };
  state.bc.onmessage = msg => {
    if (state.messagesCallback) {
      state.messagesCallback(msg.data);
    }
  };
  return state;
}
function close(channelState) {
  channelState.bc.close();
  channelState.subFns = [];
}
function postMessage(channelState, messageJson) {
  try {
    channelState.bc.postMessage(messageJson);
    return util.PROMISE_RESOLVED_VOID;
  } catch (err) {
    return Promise.reject(err);
  }
}
function onMessage(channelState, fn) {
  channelState.messagesCallback = fn;
}
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 (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;
  }
  return false;
}
function averageResponseTime() {
  return 150;
}

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