socketcluster-client/lib/ws-browser.js

SocketCluster JavaScript client

let globalScope;
if (typeof WorkerGlobalScope !== 'undefined') {
  globalScope = self;
} else {
  globalScope = typeof window !== 'undefined' && window || (function() { return this; })();
}

const WebSocket = globalScope.WebSocket || globalScope.MozWebSocket;

/**
 * WebSocket constructor.
 *
 * The third `opts` options object gets ignored in web browsers, since it's
 * non-standard, and throws a TypeError if passed to the constructor.
 * See: https://github.com/einaros/ws/issues/227
 *
 * @param {String} uri
 * @param {Array} protocols (optional)
 * @param {Object} opts (optional)
 * @api public
 */

function ws(uri, protocols, opts) {
  let instance;
  if (protocols) {
    instance = new WebSocket(uri, protocols);
  } else {
    instance = new WebSocket(uri);
  }
  return instance;
}

if (WebSocket) ws.prototype = WebSocket.prototype;

module.exports = WebSocket ? ws : null;