diff --git a/demo_websockets/package-lock.json b/demo_websockets/package-lock.json
new file mode 100644
index 0000000000000000000000000000000000000000..b2baf806f300555246a9bab2785b766f2d142b23
--- /dev/null
+++ b/demo_websockets/package-lock.json
@@ -0,0 +1,1018 @@
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+ "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==",
+ "license": "MIT"
+ },
+ "node_modules/statuses": {
+ "version": "2.0.1",
+ "resolved": "https://registry.npmjs.org/statuses/-/statuses-2.0.1.tgz",
+ "integrity": "sha512-RwNA9Z/7PrK06rYLIzFMlaF+l73iwpzsqRIFgbMLbTcLD6cOao82TaWefPXQvB2fOC4AjuYSEndS7N/mTCbkdQ==",
+ "license": "MIT",
+ "engines": {
+ "node": ">= 0.8"
+ }
+ },
+ "node_modules/toidentifier": {
+ "version": "1.0.1",
+ "resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.1.tgz",
+ "integrity": "sha512-o5sSPKEkg/DIQNmH43V0/uerLrpzVedkUh8tGNvaeXpfpuwjKenlSox/2O/BTlZUtEe+JG7s5YhEz608PlAHRA==",
+ "license": "MIT",
+ "engines": {
+ "node": ">=0.6"
+ }
+ },
+ "node_modules/type-is": {
+ "version": "1.6.18",
+ "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.18.tgz",
+ "integrity": "sha512-TkRKr9sUTxEH8MdfuCSP7VizJyzRNMjj2J2do2Jr3Kym598JVdEksuzPQCnlFPW4ky9Q+iA+ma9BGm06XQBy8g==",
+ "license": "MIT",
+ "dependencies": {
+ "media-typer": "0.3.0",
+ "mime-types": "~2.1.24"
+ },
+ "engines": {
+ "node": ">= 0.6"
+ }
+ },
+ "node_modules/undici-types": {
+ "version": "6.13.0",
+ "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-6.13.0.tgz",
+ "integrity": "sha512-xtFJHudx8S2DSoujjMd1WeWvn7KKWFRESZTMeL1RptAYERu29D6jphMjjY+vn96jvN3kVPDNxU/E13VTaXj6jg==",
+ "license": "MIT"
+ },
+ "node_modules/unpipe": {
+ "version": "1.0.0",
+ "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
+ "integrity": "sha512-pjy2bYhSsufwWlKwPc+l3cN7+wuJlK6uz0YdJEOlQDbl6jo/YlPi4mb8agUkVC8BF7V8NuzeyPNqRksA3hztKQ==",
+ "license": "MIT",
+ "engines": {
+ "node": ">= 0.8"
+ }
+ },
+ "node_modules/utils-merge": {
+ "version": "1.0.1",
+ "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
+ "integrity": "sha512-pMZTvIkT1d+TFGvDOqodOclx0QWkkgi6Tdoa8gC8ffGAAqz9pzPTZWAybbsHHoED/ztMtkv/VoYTYyShUn81hA==",
+ "license": "MIT",
+ "engines": {
+ "node": ">= 0.4.0"
+ }
+ },
+ "node_modules/vary": {
+ "version": "1.1.2",
+ "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+ "integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg==",
+ "license": "MIT",
+ "engines": {
+ "node": ">= 0.8"
+ }
+ },
+ "node_modules/ws": {
+ "version": "8.17.1",
+ "resolved": "https://registry.npmjs.org/ws/-/ws-8.17.1.tgz",
+ "integrity": "sha512-6XQFvXTkbfUOZOKKILFG1PDK2NDQs4azKQl26T0YS5CxqWLgXajbPZ+h4gZekJyRqFU8pvnbAbbs/3TgRPy+GQ==",
+ "license": "MIT",
+ "engines": {
+ "node": ">=10.0.0"
+ },
+ "peerDependencies": {
+ "bufferutil": "^4.0.1",
+ "utf-8-validate": ">=5.0.2"
+ },
+ "peerDependenciesMeta": {
+ "bufferutil": {
+ "optional": true
+ },
+ "utf-8-validate": {
+ "optional": true
+ }
+ }
+ }
+ }
+}
diff --git a/demo_websockets/package.json b/demo_websockets/package.json
new file mode 100644
index 0000000000000000000000000000000000000000..3f444109a61cb9c16ef8eb2e31076609dde98523
--- /dev/null
+++ b/demo_websockets/package.json
@@ -0,0 +1,9 @@
+{
+ "scripts": {
+ "start": "node server.js"
+ },
+ "dependencies": {
+ "express": "^4.19.2",
+ "socket.io": "^4.7.5"
+ }
+}
diff --git a/demo_websockets/public/index.html b/demo_websockets/public/index.html
new file mode 100644
index 0000000000000000000000000000000000000000..51221d8f5d13ed34e62e56f8b122cefade267391
--- /dev/null
+++ b/demo_websockets/public/index.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+ <meta charset="utf-8">
+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
+ <title>Demo</title>
+</head>
+<body>
+ <button id="send">Create chatroom</button>
+ <div id="ids"></div>
+
+ <!-- no sockets on this page - we don't need 'em
+ we just get the room code with good ol' Ajax -->
+
+ <script>
+ let button = document.getElementById("send");
+ let idsDiv = document.getElementById("ids");
+ button.addEventListener("click", async () => {
+ let response = await fetch("/create", { method: "POST" })
+ let { roomId } = await response.json();
+ // will redirect to new chatroom immediately
+ window.location = `/room/${roomId}`;
+ });
+ </script>
+</body>
+</html>
diff --git a/demo_websockets/public/room.html b/demo_websockets/public/room.html
new file mode 100644
index 0000000000000000000000000000000000000000..bedabbcc7551c545b8eece33085770ec446a23e8
--- /dev/null
+++ b/demo_websockets/public/room.html
@@ -0,0 +1,65 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+ <meta charset="utf-8">
+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
+ <title>Demo</title>
+</head>
+<body>
+ <input id="input">
+ <button id="send">Send</button>
+ <div id="messages"></div>
+
+ <!-- MUST INCLUDE SOCKET LIBRARY HERE -->
+ <!-- REMEMBER TO COPY THIS FROM socket.io's node_modules INTO public -->
+ <script src="/socket.io/socket.io.js"></script>
+
+ <script>
+ // extract room ID from URL
+ // if we did server side rendering, server could embed it in the JS for us
+ let pathParts = window.location.pathname.split("/");
+ let roomId = pathParts[pathParts.length - 1] ;
+
+ function appendMessage(message) {
+ let item = document.createElement("div");
+ item.textContent = message;
+ messagesDiv.appendChild(item);
+ }
+
+ let socket = io();
+ // WARNING: socket.connected will NOT be true immediately
+ // if you try to immediately emit an event
+ // it'll wait until it's connected, then send - that's fine
+ socket.emit("hello", "world"); // works
+ // but if you wanted to e.g. do something with the socket id
+ // it will be undefined until the socket connects
+ console.log(socket.id); // undefined, b/c hasn't connected yet
+ // so if you need the id for some reason
+ // you can register an event listener for the connected event:
+ socket.on("connect", () => { console.log("I am connected", socket.id); });
+
+ let button = document.getElementById("send");
+ let input = document.getElementById("input");
+ let messagesDiv = document.getElementById("messages");
+
+ button.addEventListener("click", () => {
+ let message = input.value;
+ if (message === "") {
+ return;
+ }
+ console.log("Sending message:", message);
+ // socket.emit can send a string, object, array, etc.
+ socket.emit("foo", { message });
+ // need to append its own message, as it won't receive its own event
+ appendMessage(message);
+ });
+
+ /* MUST REGISTER socket.on(event) listener FOR EVERY event SERVER CAN SEND */
+
+ socket.on("bar", function(data) {
+ console.log("Received message:", data);
+ appendMessage(data);
+ });
+ </script>
+</body>
+</html>
diff --git a/demo_websockets/public/socket.io.js b/demo_websockets/public/socket.io.js
new file mode 100644
index 0000000000000000000000000000000000000000..2d84e28e0f7d709eaf3a50548f8e359977f4b9e0
--- /dev/null
+++ b/demo_websockets/public/socket.io.js
@@ -0,0 +1,5015 @@
+/*!
+ * Socket.IO v4.7.5
+ * (c) 2014-2024 Guillermo Rauch
+ * Released under the MIT License.
+ */
+(function (global, factory) {
+ typeof exports === "object" && typeof module !== "undefined"
+ ? (module.exports = factory())
+ : typeof define === "function" && define.amd
+ ? define(factory)
+ : ((global =
+ typeof globalThis !== "undefined" ? globalThis : global || self),
+ (global.io = factory()));
+})(this, function () {
+ "use strict";
+
+ function _typeof(obj) {
+ "@babel/helpers - typeof";
+
+ return (
+ (_typeof =
+ "function" == typeof Symbol && "symbol" == typeof Symbol.iterator
+ ? function (obj) {
+ return typeof obj;
+ }
+ : function (obj) {
+ return obj &&
+ "function" == typeof Symbol &&
+ obj.constructor === Symbol &&
+ obj !== Symbol.prototype
+ ? "symbol"
+ : typeof obj;
+ }),
+ _typeof(obj)
+ );
+ }
+ function _classCallCheck(instance, Constructor) {
+ if (!(instance instanceof Constructor)) {
+ throw new TypeError("Cannot call a class as a function");
+ }
+ }
+ function _defineProperties(target, props) {
+ for (var i = 0; i < props.length; i++) {
+ var descriptor = props[i];
+ descriptor.enumerable = descriptor.enumerable || false;
+ descriptor.configurable = true;
+ if ("value" in descriptor) descriptor.writable = true;
+ Object.defineProperty(target, _toPropertyKey(descriptor.key), descriptor);
+ }
+ }
+ function _createClass(Constructor, protoProps, staticProps) {
+ if (protoProps) _defineProperties(Constructor.prototype, protoProps);
+ if (staticProps) _defineProperties(Constructor, staticProps);
+ Object.defineProperty(Constructor, "prototype", {
+ writable: false,
+ });
+ return Constructor;
+ }
+ function _extends() {
+ _extends = Object.assign
+ ? Object.assign.bind()
+ : function (target) {
+ for (var i = 1; i < arguments.length; i++) {
+ var source = arguments[i];
+ for (var key in source) {
+ if (Object.prototype.hasOwnProperty.call(source, key)) {
+ target[key] = source[key];
+ }
+ }
+ }
+ return target;
+ };
+ return _extends.apply(this, arguments);
+ }
+ function _inherits(subClass, superClass) {
+ if (typeof superClass !== "function" && superClass !== null) {
+ throw new TypeError("Super expression must either be null or a function");
+ }
+ subClass.prototype = Object.create(superClass && superClass.prototype, {
+ constructor: {
+ value: subClass,
+ writable: true,
+ configurable: true,
+ },
+ });
+ Object.defineProperty(subClass, "prototype", {
+ writable: false,
+ });
+ if (superClass) _setPrototypeOf(subClass, superClass);
+ }
+ function _getPrototypeOf(o) {
+ _getPrototypeOf = Object.setPrototypeOf
+ ? Object.getPrototypeOf.bind()
+ : function _getPrototypeOf(o) {
+ return o.__proto__ || Object.getPrototypeOf(o);
+ };
+ return _getPrototypeOf(o);
+ }
+ function _setPrototypeOf(o, p) {
+ _setPrototypeOf = Object.setPrototypeOf
+ ? Object.setPrototypeOf.bind()
+ : function _setPrototypeOf(o, p) {
+ o.__proto__ = p;
+ return o;
+ };
+ return _setPrototypeOf(o, p);
+ }
+ function _isNativeReflectConstruct() {
+ if (typeof Reflect === "undefined" || !Reflect.construct) return false;
+ if (Reflect.construct.sham) return false;
+ if (typeof Proxy === "function") return true;
+ try {
+ Boolean.prototype.valueOf.call(
+ Reflect.construct(Boolean, [], function () {}),
+ );
+ return true;
+ } catch (e) {
+ return false;
+ }
+ }
+ function _construct(Parent, args, Class) {
+ if (_isNativeReflectConstruct()) {
+ _construct = Reflect.construct.bind();
+ } else {
+ _construct = function _construct(Parent, args, Class) {
+ var a = [null];
+ a.push.apply(a, args);
+ var Constructor = Function.bind.apply(Parent, a);
+ var instance = new Constructor();
+ if (Class) _setPrototypeOf(instance, Class.prototype);
+ return instance;
+ };
+ }
+ return _construct.apply(null, arguments);
+ }
+ function _isNativeFunction(fn) {
+ return Function.toString.call(fn).indexOf("[native code]") !== -1;
+ }
+ function _wrapNativeSuper(Class) {
+ var _cache = typeof Map === "function" ? new Map() : undefined;
+ _wrapNativeSuper = function _wrapNativeSuper(Class) {
+ if (Class === null || !_isNativeFunction(Class)) return Class;
+ if (typeof Class !== "function") {
+ throw new TypeError(
+ "Super expression must either be null or a function",
+ );
+ }
+ if (typeof _cache !== "undefined") {
+ if (_cache.has(Class)) return _cache.get(Class);
+ _cache.set(Class, Wrapper);
+ }
+ function Wrapper() {
+ return _construct(Class, arguments, _getPrototypeOf(this).constructor);
+ }
+ Wrapper.prototype = Object.create(Class.prototype, {
+ constructor: {
+ value: Wrapper,
+ enumerable: false,
+ writable: true,
+ configurable: true,
+ },
+ });
+ return _setPrototypeOf(Wrapper, Class);
+ };
+ return _wrapNativeSuper(Class);
+ }
+ function _assertThisInitialized(self) {
+ if (self === void 0) {
+ throw new ReferenceError(
+ "this hasn't been initialised - super() hasn't been called",
+ );
+ }
+ return self;
+ }
+ function _possibleConstructorReturn(self, call) {
+ if (call && (typeof call === "object" || typeof call === "function")) {
+ return call;
+ } else if (call !== void 0) {
+ throw new TypeError(
+ "Derived constructors may only return object or undefined",
+ );
+ }
+ return _assertThisInitialized(self);
+ }
+ function _createSuper(Derived) {
+ var hasNativeReflectConstruct = _isNativeReflectConstruct();
+ return function _createSuperInternal() {
+ var Super = _getPrototypeOf(Derived),
+ result;
+ if (hasNativeReflectConstruct) {
+ var NewTarget = _getPrototypeOf(this).constructor;
+ result = Reflect.construct(Super, arguments, NewTarget);
+ } else {
+ result = Super.apply(this, arguments);
+ }
+ return _possibleConstructorReturn(this, result);
+ };
+ }
+ function _superPropBase(object, property) {
+ while (!Object.prototype.hasOwnProperty.call(object, property)) {
+ object = _getPrototypeOf(object);
+ if (object === null) break;
+ }
+ return object;
+ }
+ function _get() {
+ if (typeof Reflect !== "undefined" && Reflect.get) {
+ _get = Reflect.get.bind();
+ } else {
+ _get = function _get(target, property, receiver) {
+ var base = _superPropBase(target, property);
+ if (!base) return;
+ var desc = Object.getOwnPropertyDescriptor(base, property);
+ if (desc.get) {
+ return desc.get.call(arguments.length < 3 ? target : receiver);
+ }
+ return desc.value;
+ };
+ }
+ return _get.apply(this, arguments);
+ }
+ function _unsupportedIterableToArray(o, minLen) {
+ if (!o) return;
+ if (typeof o === "string") return _arrayLikeToArray(o, minLen);
+ var n = Object.prototype.toString.call(o).slice(8, -1);
+ if (n === "Object" && o.constructor) n = o.constructor.name;
+ if (n === "Map" || n === "Set") return Array.from(o);
+ if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n))
+ return _arrayLikeToArray(o, minLen);
+ }
+ function _arrayLikeToArray(arr, len) {
+ if (len == null || len > arr.length) len = arr.length;
+ for (var i = 0, arr2 = new Array(len); i < len; i++) arr2[i] = arr[i];
+ return arr2;
+ }
+ function _createForOfIteratorHelper(o, allowArrayLike) {
+ var it =
+ (typeof Symbol !== "undefined" && o[Symbol.iterator]) || o["@@iterator"];
+ if (!it) {
+ if (
+ Array.isArray(o) ||
+ (it = _unsupportedIterableToArray(o)) ||
+ (allowArrayLike && o && typeof o.length === "number")
+ ) {
+ if (it) o = it;
+ var i = 0;
+ var F = function () {};
+ return {
+ s: F,
+ n: function () {
+ if (i >= o.length)
+ return {
+ done: true,
+ };
+ return {
+ done: false,
+ value: o[i++],
+ };
+ },
+ e: function (e) {
+ throw e;
+ },
+ f: F,
+ };
+ }
+ throw new TypeError(
+ "Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.",
+ );
+ }
+ var normalCompletion = true,
+ didErr = false,
+ err;
+ return {
+ s: function () {
+ it = it.call(o);
+ },
+ n: function () {
+ var step = it.next();
+ normalCompletion = step.done;
+ return step;
+ },
+ e: function (e) {
+ didErr = true;
+ err = e;
+ },
+ f: function () {
+ try {
+ if (!normalCompletion && it.return != null) it.return();
+ } finally {
+ if (didErr) throw err;
+ }
+ },
+ };
+ }
+ function _toPrimitive(input, hint) {
+ if (typeof input !== "object" || input === null) return input;
+ var prim = input[Symbol.toPrimitive];
+ if (prim !== undefined) {
+ var res = prim.call(input, hint || "default");
+ if (typeof res !== "object") return res;
+ throw new TypeError("@@toPrimitive must return a primitive value.");
+ }
+ return (hint === "string" ? String : Number)(input);
+ }
+ function _toPropertyKey(arg) {
+ var key = _toPrimitive(arg, "string");
+ return typeof key === "symbol" ? key : String(key);
+ }
+
+ var PACKET_TYPES = Object.create(null); // no Map = no polyfill
+ PACKET_TYPES["open"] = "0";
+ PACKET_TYPES["close"] = "1";
+ PACKET_TYPES["ping"] = "2";
+ PACKET_TYPES["pong"] = "3";
+ PACKET_TYPES["message"] = "4";
+ PACKET_TYPES["upgrade"] = "5";
+ PACKET_TYPES["noop"] = "6";
+ var PACKET_TYPES_REVERSE = Object.create(null);
+ Object.keys(PACKET_TYPES).forEach(function (key) {
+ PACKET_TYPES_REVERSE[PACKET_TYPES[key]] = key;
+ });
+ var ERROR_PACKET = {
+ type: "error",
+ data: "parser error",
+ };
+
+ var withNativeBlob$1 =
+ typeof Blob === "function" ||
+ (typeof Blob !== "undefined" &&
+ Object.prototype.toString.call(Blob) === "[object BlobConstructor]");
+ var withNativeArrayBuffer$2 = typeof ArrayBuffer === "function";
+ // ArrayBuffer.isView method is not defined in IE10
+ var isView$1 = function isView(obj) {
+ return typeof ArrayBuffer.isView === "function"
+ ? ArrayBuffer.isView(obj)
+ : obj && obj.buffer instanceof ArrayBuffer;
+ };
+ var encodePacket = function encodePacket(_ref, supportsBinary, callback) {
+ var type = _ref.type,
+ data = _ref.data;
+ if (withNativeBlob$1 && data instanceof Blob) {
+ if (supportsBinary) {
+ return callback(data);
+ } else {
+ return encodeBlobAsBase64(data, callback);
+ }
+ } else if (
+ withNativeArrayBuffer$2 &&
+ (data instanceof ArrayBuffer || isView$1(data))
+ ) {
+ if (supportsBinary) {
+ return callback(data);
+ } else {
+ return encodeBlobAsBase64(new Blob([data]), callback);
+ }
+ }
+ // plain string
+ return callback(PACKET_TYPES[type] + (data || ""));
+ };
+ var encodeBlobAsBase64 = function encodeBlobAsBase64(data, callback) {
+ var fileReader = new FileReader();
+ fileReader.onload = function () {
+ var content = fileReader.result.split(",")[1];
+ callback("b" + (content || ""));
+ };
+ return fileReader.readAsDataURL(data);
+ };
+ function toArray(data) {
+ if (data instanceof Uint8Array) {
+ return data;
+ } else if (data instanceof ArrayBuffer) {
+ return new Uint8Array(data);
+ } else {
+ return new Uint8Array(data.buffer, data.byteOffset, data.byteLength);
+ }
+ }
+ var TEXT_ENCODER;
+ function encodePacketToBinary(packet, callback) {
+ if (withNativeBlob$1 && packet.data instanceof Blob) {
+ return packet.data.arrayBuffer().then(toArray).then(callback);
+ } else if (
+ withNativeArrayBuffer$2 &&
+ (packet.data instanceof ArrayBuffer || isView$1(packet.data))
+ ) {
+ return callback(toArray(packet.data));
+ }
+ encodePacket(packet, false, function (encoded) {
+ if (!TEXT_ENCODER) {
+ TEXT_ENCODER = new TextEncoder();
+ }
+ callback(TEXT_ENCODER.encode(encoded));
+ });
+ }
+
+ // imported from https://github.com/socketio/base64-arraybuffer
+ var chars =
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+ // Use a lookup table to find the index.
+ var lookup$1 = typeof Uint8Array === "undefined" ? [] : new Uint8Array(256);
+ for (var i$1 = 0; i$1 < chars.length; i$1++) {
+ lookup$1[chars.charCodeAt(i$1)] = i$1;
+ }
+ var decode$1 = function decode(base64) {
+ var bufferLength = base64.length * 0.75,
+ len = base64.length,
+ i,
+ p = 0,
+ encoded1,
+ encoded2,
+ encoded3,
+ encoded4;
+ if (base64[base64.length - 1] === "=") {
+ bufferLength--;
+ if (base64[base64.length - 2] === "=") {
+ bufferLength--;
+ }
+ }
+ var arraybuffer = new ArrayBuffer(bufferLength),
+ bytes = new Uint8Array(arraybuffer);
+ for (i = 0; i < len; i += 4) {
+ encoded1 = lookup$1[base64.charCodeAt(i)];
+ encoded2 = lookup$1[base64.charCodeAt(i + 1)];
+ encoded3 = lookup$1[base64.charCodeAt(i + 2)];
+ encoded4 = lookup$1[base64.charCodeAt(i + 3)];
+ bytes[p++] = (encoded1 << 2) | (encoded2 >> 4);
+ bytes[p++] = ((encoded2 & 15) << 4) | (encoded3 >> 2);
+ bytes[p++] = ((encoded3 & 3) << 6) | (encoded4 & 63);
+ }
+ return arraybuffer;
+ };
+
+ var withNativeArrayBuffer$1 = typeof ArrayBuffer === "function";
+ var decodePacket = function decodePacket(encodedPacket, binaryType) {
+ if (typeof encodedPacket !== "string") {
+ return {
+ type: "message",
+ data: mapBinary(encodedPacket, binaryType),
+ };
+ }
+ var type = encodedPacket.charAt(0);
+ if (type === "b") {
+ return {
+ type: "message",
+ data: decodeBase64Packet(encodedPacket.substring(1), binaryType),
+ };
+ }
+ var packetType = PACKET_TYPES_REVERSE[type];
+ if (!packetType) {
+ return ERROR_PACKET;
+ }
+ return encodedPacket.length > 1
+ ? {
+ type: PACKET_TYPES_REVERSE[type],
+ data: encodedPacket.substring(1),
+ }
+ : {
+ type: PACKET_TYPES_REVERSE[type],
+ };
+ };
+ var decodeBase64Packet = function decodeBase64Packet(data, binaryType) {
+ if (withNativeArrayBuffer$1) {
+ var decoded = decode$1(data);
+ return mapBinary(decoded, binaryType);
+ } else {
+ return {
+ base64: true,
+ data: data,
+ }; // fallback for old browsers
+ }
+ };
+
+ var mapBinary = function mapBinary(data, binaryType) {
+ switch (binaryType) {
+ case "blob":
+ if (data instanceof Blob) {
+ // from WebSocket + binaryType "blob"
+ return data;
+ } else {
+ // from HTTP long-polling or WebTransport
+ return new Blob([data]);
+ }
+ case "arraybuffer":
+ default:
+ if (data instanceof ArrayBuffer) {
+ // from HTTP long-polling (base64) or WebSocket + binaryType "arraybuffer"
+ return data;
+ } else {
+ // from WebTransport (Uint8Array)
+ return data.buffer;
+ }
+ }
+ };
+
+ var SEPARATOR = String.fromCharCode(30); // see https://en.wikipedia.org/wiki/Delimiter#ASCII_delimited_text
+ var encodePayload = function encodePayload(packets, callback) {
+ // some packets may be added to the array while encoding, so the initial length must be saved
+ var length = packets.length;
+ var encodedPackets = new Array(length);
+ var count = 0;
+ packets.forEach(function (packet, i) {
+ // force base64 encoding for binary packets
+ encodePacket(packet, false, function (encodedPacket) {
+ encodedPackets[i] = encodedPacket;
+ if (++count === length) {
+ callback(encodedPackets.join(SEPARATOR));
+ }
+ });
+ });
+ };
+ var decodePayload = function decodePayload(encodedPayload, binaryType) {
+ var encodedPackets = encodedPayload.split(SEPARATOR);
+ var packets = [];
+ for (var i = 0; i < encodedPackets.length; i++) {
+ var decodedPacket = decodePacket(encodedPackets[i], binaryType);
+ packets.push(decodedPacket);
+ if (decodedPacket.type === "error") {
+ break;
+ }
+ }
+ return packets;
+ };
+ function createPacketEncoderStream() {
+ return new TransformStream({
+ transform: function transform(packet, controller) {
+ encodePacketToBinary(packet, function (encodedPacket) {
+ var payloadLength = encodedPacket.length;
+ var header;
+ // inspired by the WebSocket format: https://developer.mozilla.org/en-US/docs/Web/API/WebSockets_API/Writing_WebSocket_servers#decoding_payload_length
+ if (payloadLength < 126) {
+ header = new Uint8Array(1);
+ new DataView(header.buffer).setUint8(0, payloadLength);
+ } else if (payloadLength < 65536) {
+ header = new Uint8Array(3);
+ var view = new DataView(header.buffer);
+ view.setUint8(0, 126);
+ view.setUint16(1, payloadLength);
+ } else {
+ header = new Uint8Array(9);
+ var _view = new DataView(header.buffer);
+ _view.setUint8(0, 127);
+ _view.setBigUint64(1, BigInt(payloadLength));
+ }
+ // first bit indicates whether the payload is plain text (0) or binary (1)
+ if (packet.data && typeof packet.data !== "string") {
+ header[0] |= 0x80;
+ }
+ controller.enqueue(header);
+ controller.enqueue(encodedPacket);
+ });
+ },
+ });
+ }
+ var TEXT_DECODER;
+ function totalLength(chunks) {
+ return chunks.reduce(function (acc, chunk) {
+ return acc + chunk.length;
+ }, 0);
+ }
+ function concatChunks(chunks, size) {
+ if (chunks[0].length === size) {
+ return chunks.shift();
+ }
+ var buffer = new Uint8Array(size);
+ var j = 0;
+ for (var i = 0; i < size; i++) {
+ buffer[i] = chunks[0][j++];
+ if (j === chunks[0].length) {
+ chunks.shift();
+ j = 0;
+ }
+ }
+ if (chunks.length && j < chunks[0].length) {
+ chunks[0] = chunks[0].slice(j);
+ }
+ return buffer;
+ }
+ function createPacketDecoderStream(maxPayload, binaryType) {
+ if (!TEXT_DECODER) {
+ TEXT_DECODER = new TextDecoder();
+ }
+ var chunks = [];
+ var state = 0; /* READ_HEADER */
+ var expectedLength = -1;
+ var isBinary = false;
+ return new TransformStream({
+ transform: function transform(chunk, controller) {
+ chunks.push(chunk);
+ while (true) {
+ if (state === 0 /* READ_HEADER */) {
+ if (totalLength(chunks) < 1) {
+ break;
+ }
+ var header = concatChunks(chunks, 1);
+ isBinary = (header[0] & 0x80) === 0x80;
+ expectedLength = header[0] & 0x7f;
+ if (expectedLength < 126) {
+ state = 3 /* READ_PAYLOAD */;
+ } else if (expectedLength === 126) {
+ state = 1 /* READ_EXTENDED_LENGTH_16 */;
+ } else {
+ state = 2 /* READ_EXTENDED_LENGTH_64 */;
+ }
+ } else if (state === 1 /* READ_EXTENDED_LENGTH_16 */) {
+ if (totalLength(chunks) < 2) {
+ break;
+ }
+ var headerArray = concatChunks(chunks, 2);
+ expectedLength = new DataView(
+ headerArray.buffer,
+ headerArray.byteOffset,
+ headerArray.length,
+ ).getUint16(0);
+ state = 3 /* READ_PAYLOAD */;
+ } else if (state === 2 /* READ_EXTENDED_LENGTH_64 */) {
+ if (totalLength(chunks) < 8) {
+ break;
+ }
+ var _headerArray = concatChunks(chunks, 8);
+ var view = new DataView(
+ _headerArray.buffer,
+ _headerArray.byteOffset,
+ _headerArray.length,
+ );
+ var n = view.getUint32(0);
+ if (n > Math.pow(2, 53 - 32) - 1) {
+ // the maximum safe integer in JavaScript is 2^53 - 1
+ controller.enqueue(ERROR_PACKET);
+ break;
+ }
+ expectedLength = n * Math.pow(2, 32) + view.getUint32(4);
+ state = 3 /* READ_PAYLOAD */;
+ } else {
+ if (totalLength(chunks) < expectedLength) {
+ break;
+ }
+ var data = concatChunks(chunks, expectedLength);
+ controller.enqueue(
+ decodePacket(
+ isBinary ? data : TEXT_DECODER.decode(data),
+ binaryType,
+ ),
+ );
+ state = 0 /* READ_HEADER */;
+ }
+
+ if (expectedLength === 0 || expectedLength > maxPayload) {
+ controller.enqueue(ERROR_PACKET);
+ break;
+ }
+ }
+ },
+ });
+ }
+ var protocol$1 = 4;
+
+ /**
+ * Initialize a new `Emitter`.
+ *
+ * @api public
+ */
+
+ function Emitter(obj) {
+ if (obj) return mixin(obj);
+ }
+
+ /**
+ * Mixin the emitter properties.
+ *
+ * @param {Object} obj
+ * @return {Object}
+ * @api private
+ */
+
+ function mixin(obj) {
+ for (var key in Emitter.prototype) {
+ obj[key] = Emitter.prototype[key];
+ }
+ return obj;
+ }
+
+ /**
+ * Listen on the given `event` with `fn`.
+ *
+ * @param {String} event
+ * @param {Function} fn
+ * @return {Emitter}
+ * @api public
+ */
+
+ Emitter.prototype.on = Emitter.prototype.addEventListener = function (
+ event,
+ fn,
+ ) {
+ this._callbacks = this._callbacks || {};
+ (this._callbacks["$" + event] = this._callbacks["$" + event] || []).push(
+ fn,
+ );
+ return this;
+ };
+
+ /**
+ * Adds an `event` listener that will be invoked a single
+ * time then automatically removed.
+ *
+ * @param {String} event
+ * @param {Function} fn
+ * @return {Emitter}
+ * @api public
+ */
+
+ Emitter.prototype.once = function (event, fn) {
+ function on() {
+ this.off(event, on);
+ fn.apply(this, arguments);
+ }
+ on.fn = fn;
+ this.on(event, on);
+ return this;
+ };
+
+ /**
+ * Remove the given callback for `event` or all
+ * registered callbacks.
+ *
+ * @param {String} event
+ * @param {Function} fn
+ * @return {Emitter}
+ * @api public
+ */
+
+ Emitter.prototype.off =
+ Emitter.prototype.removeListener =
+ Emitter.prototype.removeAllListeners =
+ Emitter.prototype.removeEventListener =
+ function (event, fn) {
+ this._callbacks = this._callbacks || {};
+
+ // all
+ if (0 == arguments.length) {
+ this._callbacks = {};
+ return this;
+ }
+
+ // specific event
+ var callbacks = this._callbacks["$" + event];
+ if (!callbacks) return this;
+
+ // remove all handlers
+ if (1 == arguments.length) {
+ delete this._callbacks["$" + event];
+ return this;
+ }
+
+ // remove specific handler
+ var cb;
+ for (var i = 0; i < callbacks.length; i++) {
+ cb = callbacks[i];
+ if (cb === fn || cb.fn === fn) {
+ callbacks.splice(i, 1);
+ break;
+ }
+ }
+
+ // Remove event specific arrays for event types that no
+ // one is subscribed for to avoid memory leak.
+ if (callbacks.length === 0) {
+ delete this._callbacks["$" + event];
+ }
+ return this;
+ };
+
+ /**
+ * Emit `event` with the given args.
+ *
+ * @param {String} event
+ * @param {Mixed} ...
+ * @return {Emitter}
+ */
+
+ Emitter.prototype.emit = function (event) {
+ this._callbacks = this._callbacks || {};
+ var args = new Array(arguments.length - 1),
+ callbacks = this._callbacks["$" + event];
+ for (var i = 1; i < arguments.length; i++) {
+ args[i - 1] = arguments[i];
+ }
+ if (callbacks) {
+ callbacks = callbacks.slice(0);
+ for (var i = 0, len = callbacks.length; i < len; ++i) {
+ callbacks[i].apply(this, args);
+ }
+ }
+ return this;
+ };
+
+ // alias used for reserved events (protected method)
+ Emitter.prototype.emitReserved = Emitter.prototype.emit;
+
+ /**
+ * Return array of callbacks for `event`.
+ *
+ * @param {String} event
+ * @return {Array}
+ * @api public
+ */
+
+ Emitter.prototype.listeners = function (event) {
+ this._callbacks = this._callbacks || {};
+ return this._callbacks["$" + event] || [];
+ };
+
+ /**
+ * Check if this emitter has `event` handlers.
+ *
+ * @param {String} event
+ * @return {Boolean}
+ * @api public
+ */
+
+ Emitter.prototype.hasListeners = function (event) {
+ return !!this.listeners(event).length;
+ };
+
+ var globalThisShim = (function () {
+ if (typeof self !== "undefined") {
+ return self;
+ } else if (typeof window !== "undefined") {
+ return window;
+ } else {
+ return Function("return this")();
+ }
+ })();
+
+ function pick(obj) {
+ for (
+ var _len = arguments.length,
+ attr = new Array(_len > 1 ? _len - 1 : 0),
+ _key = 1;
+ _key < _len;
+ _key++
+ ) {
+ attr[_key - 1] = arguments[_key];
+ }
+ return attr.reduce(function (acc, k) {
+ if (obj.hasOwnProperty(k)) {
+ acc[k] = obj[k];
+ }
+ return acc;
+ }, {});
+ }
+ // Keep a reference to the real timeout functions so they can be used when overridden
+ var NATIVE_SET_TIMEOUT = globalThisShim.setTimeout;
+ var NATIVE_CLEAR_TIMEOUT = globalThisShim.clearTimeout;
+ function installTimerFunctions(obj, opts) {
+ if (opts.useNativeTimers) {
+ obj.setTimeoutFn = NATIVE_SET_TIMEOUT.bind(globalThisShim);
+ obj.clearTimeoutFn = NATIVE_CLEAR_TIMEOUT.bind(globalThisShim);
+ } else {
+ obj.setTimeoutFn = globalThisShim.setTimeout.bind(globalThisShim);
+ obj.clearTimeoutFn = globalThisShim.clearTimeout.bind(globalThisShim);
+ }
+ }
+ // base64 encoded buffers are about 33% bigger (https://en.wikipedia.org/wiki/Base64)
+ var BASE64_OVERHEAD = 1.33;
+ // we could also have used `new Blob([obj]).size`, but it isn't supported in IE9
+ function byteLength(obj) {
+ if (typeof obj === "string") {
+ return utf8Length(obj);
+ }
+ // arraybuffer or blob
+ return Math.ceil((obj.byteLength || obj.size) * BASE64_OVERHEAD);
+ }
+ function utf8Length(str) {
+ var c = 0,
+ length = 0;
+ for (var i = 0, l = str.length; i < l; i++) {
+ c = str.charCodeAt(i);
+ if (c < 0x80) {
+ length += 1;
+ } else if (c < 0x800) {
+ length += 2;
+ } else if (c < 0xd800 || c >= 0xe000) {
+ length += 3;
+ } else {
+ i++;
+ length += 4;
+ }
+ }
+ return length;
+ }
+
+ // imported from https://github.com/galkn/querystring
+ /**
+ * Compiles a querystring
+ * Returns string representation of the object
+ *
+ * @param {Object}
+ * @api private
+ */
+ function encode$1(obj) {
+ var str = "";
+ for (var i in obj) {
+ if (obj.hasOwnProperty(i)) {
+ if (str.length) str += "&";
+ str += encodeURIComponent(i) + "=" + encodeURIComponent(obj[i]);
+ }
+ }
+ return str;
+ }
+ /**
+ * Parses a simple querystring into an object
+ *
+ * @param {String} qs
+ * @api private
+ */
+ function decode(qs) {
+ var qry = {};
+ var pairs = qs.split("&");
+ for (var i = 0, l = pairs.length; i < l; i++) {
+ var pair = pairs[i].split("=");
+ qry[decodeURIComponent(pair[0])] = decodeURIComponent(pair[1]);
+ }
+ return qry;
+ }
+
+ var TransportError = /*#__PURE__*/ (function (_Error) {
+ _inherits(TransportError, _Error);
+ var _super = _createSuper(TransportError);
+ function TransportError(reason, description, context) {
+ var _this;
+ _classCallCheck(this, TransportError);
+ _this = _super.call(this, reason);
+ _this.description = description;
+ _this.context = context;
+ _this.type = "TransportError";
+ return _this;
+ }
+ return _createClass(TransportError);
+ })(/*#__PURE__*/ _wrapNativeSuper(Error));
+ var Transport = /*#__PURE__*/ (function (_Emitter) {
+ _inherits(Transport, _Emitter);
+ var _super2 = _createSuper(Transport);
+ /**
+ * Transport abstract constructor.
+ *
+ * @param {Object} opts - options
+ * @protected
+ */
+ function Transport(opts) {
+ var _this2;
+ _classCallCheck(this, Transport);
+ _this2 = _super2.call(this);
+ _this2.writable = false;
+ installTimerFunctions(_assertThisInitialized(_this2), opts);
+ _this2.opts = opts;
+ _this2.query = opts.query;
+ _this2.socket = opts.socket;
+ return _this2;
+ }
+ /**
+ * Emits an error.
+ *
+ * @param {String} reason
+ * @param description
+ * @param context - the error context
+ * @return {Transport} for chaining
+ * @protected
+ */
+ _createClass(Transport, [
+ {
+ key: "onError",
+ value: function onError(reason, description, context) {
+ _get(_getPrototypeOf(Transport.prototype), "emitReserved", this).call(
+ this,
+ "error",
+ new TransportError(reason, description, context),
+ );
+ return this;
+ },
+ /**
+ * Opens the transport.
+ */
+ },
+ {
+ key: "open",
+ value: function open() {
+ this.readyState = "opening";
+ this.doOpen();
+ return this;
+ },
+ /**
+ * Closes the transport.
+ */
+ },
+ {
+ key: "close",
+ value: function close() {
+ if (this.readyState === "opening" || this.readyState === "open") {
+ this.doClose();
+ this.onClose();
+ }
+ return this;
+ },
+ /**
+ * Sends multiple packets.
+ *
+ * @param {Array} packets
+ */
+ },
+ {
+ key: "send",
+ value: function send(packets) {
+ if (this.readyState === "open") {
+ this.write(packets);
+ }
+ },
+ /**
+ * Called upon open
+ *
+ * @protected
+ */
+ },
+ {
+ key: "onOpen",
+ value: function onOpen() {
+ this.readyState = "open";
+ this.writable = true;
+ _get(_getPrototypeOf(Transport.prototype), "emitReserved", this).call(
+ this,
+ "open",
+ );
+ },
+ /**
+ * Called with data.
+ *
+ * @param {String} data
+ * @protected
+ */
+ },
+ {
+ key: "onData",
+ value: function onData(data) {
+ var packet = decodePacket(data, this.socket.binaryType);
+ this.onPacket(packet);
+ },
+ /**
+ * Called with a decoded packet.
+ *
+ * @protected
+ */
+ },
+ {
+ key: "onPacket",
+ value: function onPacket(packet) {
+ _get(_getPrototypeOf(Transport.prototype), "emitReserved", this).call(
+ this,
+ "packet",
+ packet,
+ );
+ },
+ /**
+ * Called upon close.
+ *
+ * @protected
+ */
+ },
+ {
+ key: "onClose",
+ value: function onClose(details) {
+ this.readyState = "closed";
+ _get(_getPrototypeOf(Transport.prototype), "emitReserved", this).call(
+ this,
+ "close",
+ details,
+ );
+ },
+ /**
+ * Pauses the transport, in order not to lose packets during an upgrade.
+ *
+ * @param onPause
+ */
+ },
+ {
+ key: "pause",
+ value: function pause(onPause) {},
+ },
+ {
+ key: "createUri",
+ value: function createUri(schema) {
+ var query =
+ arguments.length > 1 && arguments[1] !== undefined
+ ? arguments[1]
+ : {};
+ return (
+ schema +
+ "://" +
+ this._hostname() +
+ this._port() +
+ this.opts.path +
+ this._query(query)
+ );
+ },
+ },
+ {
+ key: "_hostname",
+ value: function _hostname() {
+ var hostname = this.opts.hostname;
+ return hostname.indexOf(":") === -1 ? hostname : "[" + hostname + "]";
+ },
+ },
+ {
+ key: "_port",
+ value: function _port() {
+ if (
+ this.opts.port &&
+ ((this.opts.secure && Number(this.opts.port !== 443)) ||
+ (!this.opts.secure && Number(this.opts.port) !== 80))
+ ) {
+ return ":" + this.opts.port;
+ } else {
+ return "";
+ }
+ },
+ },
+ {
+ key: "_query",
+ value: function _query(query) {
+ var encodedQuery = encode$1(query);
+ return encodedQuery.length ? "?" + encodedQuery : "";
+ },
+ },
+ ]);
+ return Transport;
+ })(Emitter);
+
+ // imported from https://github.com/unshiftio/yeast
+
+ var alphabet =
+ "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-_".split(
+ "",
+ ),
+ length = 64,
+ map = {};
+ var seed = 0,
+ i = 0,
+ prev;
+ /**
+ * Return a string representing the specified number.
+ *
+ * @param {Number} num The number to convert.
+ * @returns {String} The string representation of the number.
+ * @api public
+ */
+ function encode(num) {
+ var encoded = "";
+ do {
+ encoded = alphabet[num % length] + encoded;
+ num = Math.floor(num / length);
+ } while (num > 0);
+ return encoded;
+ }
+ /**
+ * Yeast: A tiny growing id generator.
+ *
+ * @returns {String} A unique id.
+ * @api public
+ */
+ function yeast() {
+ var now = encode(+new Date());
+ if (now !== prev) return (seed = 0), (prev = now);
+ return now + "." + encode(seed++);
+ }
+ //
+ // Map each character to its index.
+ //
+ for (; i < length; i++) map[alphabet[i]] = i;
+
+ // imported from https://github.com/component/has-cors
+ var value = false;
+ try {
+ value =
+ typeof XMLHttpRequest !== "undefined" &&
+ "withCredentials" in new XMLHttpRequest();
+ } catch (err) {
+ // if XMLHttp support is disabled in IE then it will throw
+ // when trying to create
+ }
+ var hasCORS = value;
+
+ // browser shim for xmlhttprequest module
+ function XHR(opts) {
+ var xdomain = opts.xdomain;
+ // XMLHttpRequest can be disabled on IE
+ try {
+ if ("undefined" !== typeof XMLHttpRequest && (!xdomain || hasCORS)) {
+ return new XMLHttpRequest();
+ }
+ } catch (e) {}
+ if (!xdomain) {
+ try {
+ return new globalThisShim[["Active"].concat("Object").join("X")](
+ "Microsoft.XMLHTTP",
+ );
+ } catch (e) {}
+ }
+ }
+ function createCookieJar() {}
+
+ function empty() {}
+ var hasXHR2 = (function () {
+ var xhr = new XHR({
+ xdomain: false,
+ });
+ return null != xhr.responseType;
+ })();
+ var Polling = /*#__PURE__*/ (function (_Transport) {
+ _inherits(Polling, _Transport);
+ var _super = _createSuper(Polling);
+ /**
+ * XHR Polling constructor.
+ *
+ * @param {Object} opts
+ * @package
+ */
+ function Polling(opts) {
+ var _this;
+ _classCallCheck(this, Polling);
+ _this = _super.call(this, opts);
+ _this.polling = false;
+ if (typeof location !== "undefined") {
+ var isSSL = "https:" === location.protocol;
+ var port = location.port;
+ // some user agents have empty `location.port`
+ if (!port) {
+ port = isSSL ? "443" : "80";
+ }
+ _this.xd =
+ (typeof location !== "undefined" &&
+ opts.hostname !== location.hostname) ||
+ port !== opts.port;
+ }
+ /**
+ * XHR supports binary
+ */
+ var forceBase64 = opts && opts.forceBase64;
+ _this.supportsBinary = hasXHR2 && !forceBase64;
+ if (_this.opts.withCredentials) {
+ _this.cookieJar = createCookieJar();
+ }
+ return _this;
+ }
+ _createClass(Polling, [
+ {
+ key: "name",
+ get: function get() {
+ return "polling";
+ },
+ /**
+ * Opens the socket (triggers polling). We write a PING message to determine
+ * when the transport is open.
+ *
+ * @protected
+ */
+ },
+ {
+ key: "doOpen",
+ value: function doOpen() {
+ this.poll();
+ },
+ /**
+ * Pauses polling.
+ *
+ * @param {Function} onPause - callback upon buffers are flushed and transport is paused
+ * @package
+ */
+ },
+ {
+ key: "pause",
+ value: function pause(onPause) {
+ var _this2 = this;
+ this.readyState = "pausing";
+ var pause = function pause() {
+ _this2.readyState = "paused";
+ onPause();
+ };
+ if (this.polling || !this.writable) {
+ var total = 0;
+ if (this.polling) {
+ total++;
+ this.once("pollComplete", function () {
+ --total || pause();
+ });
+ }
+ if (!this.writable) {
+ total++;
+ this.once("drain", function () {
+ --total || pause();
+ });
+ }
+ } else {
+ pause();
+ }
+ },
+ /**
+ * Starts polling cycle.
+ *
+ * @private
+ */
+ },
+ {
+ key: "poll",
+ value: function poll() {
+ this.polling = true;
+ this.doPoll();
+ this.emitReserved("poll");
+ },
+ /**
+ * Overloads onData to detect payloads.
+ *
+ * @protected
+ */
+ },
+ {
+ key: "onData",
+ value: function onData(data) {
+ var _this3 = this;
+ var callback = function callback(packet) {
+ // if its the first message we consider the transport open
+ if ("opening" === _this3.readyState && packet.type === "open") {
+ _this3.onOpen();
+ }
+ // if its a close packet, we close the ongoing requests
+ if ("close" === packet.type) {
+ _this3.onClose({
+ description: "transport closed by the server",
+ });
+ return false;
+ }
+ // otherwise bypass onData and handle the message
+ _this3.onPacket(packet);
+ };
+ // decode payload
+ decodePayload(data, this.socket.binaryType).forEach(callback);
+ // if an event did not trigger closing
+ if ("closed" !== this.readyState) {
+ // if we got data we're not polling
+ this.polling = false;
+ this.emitReserved("pollComplete");
+ if ("open" === this.readyState) {
+ this.poll();
+ }
+ }
+ },
+ /**
+ * For polling, send a close packet.
+ *
+ * @protected
+ */
+ },
+ {
+ key: "doClose",
+ value: function doClose() {
+ var _this4 = this;
+ var close = function close() {
+ _this4.write([
+ {
+ type: "close",
+ },
+ ]);
+ };
+ if ("open" === this.readyState) {
+ close();
+ } else {
+ // in case we're trying to close while
+ // handshaking is in progress (GH-164)
+ this.once("open", close);
+ }
+ },
+ /**
+ * Writes a packets payload.
+ *
+ * @param {Array} packets - data packets
+ * @protected
+ */
+ },
+ {
+ key: "write",
+ value: function write(packets) {
+ var _this5 = this;
+ this.writable = false;
+ encodePayload(packets, function (data) {
+ _this5.doWrite(data, function () {
+ _this5.writable = true;
+ _this5.emitReserved("drain");
+ });
+ });
+ },
+ /**
+ * Generates uri for connection.
+ *
+ * @private
+ */
+ },
+ {
+ key: "uri",
+ value: function uri() {
+ var schema = this.opts.secure ? "https" : "http";
+ var query = this.query || {};
+ // cache busting is forced
+ if (false !== this.opts.timestampRequests) {
+ query[this.opts.timestampParam] = yeast();
+ }
+ if (!this.supportsBinary && !query.sid) {
+ query.b64 = 1;
+ }
+ return this.createUri(schema, query);
+ },
+ /**
+ * Creates a request.
+ *
+ * @param {String} method
+ * @private
+ */
+ },
+ {
+ key: "request",
+ value: function request() {
+ var opts =
+ arguments.length > 0 && arguments[0] !== undefined
+ ? arguments[0]
+ : {};
+ _extends(
+ opts,
+ {
+ xd: this.xd,
+ cookieJar: this.cookieJar,
+ },
+ this.opts,
+ );
+ return new Request(this.uri(), opts);
+ },
+ /**
+ * Sends data.
+ *
+ * @param {String} data to send.
+ * @param {Function} called upon flush.
+ * @private
+ */
+ },
+ {
+ key: "doWrite",
+ value: function doWrite(data, fn) {
+ var _this6 = this;
+ var req = this.request({
+ method: "POST",
+ data: data,
+ });
+ req.on("success", fn);
+ req.on("error", function (xhrStatus, context) {
+ _this6.onError("xhr post error", xhrStatus, context);
+ });
+ },
+ /**
+ * Starts a poll cycle.
+ *
+ * @private
+ */
+ },
+ {
+ key: "doPoll",
+ value: function doPoll() {
+ var _this7 = this;
+ var req = this.request();
+ req.on("data", this.onData.bind(this));
+ req.on("error", function (xhrStatus, context) {
+ _this7.onError("xhr poll error", xhrStatus, context);
+ });
+ this.pollXhr = req;
+ },
+ },
+ ]);
+ return Polling;
+ })(Transport);
+ var Request = /*#__PURE__*/ (function (_Emitter) {
+ _inherits(Request, _Emitter);
+ var _super2 = _createSuper(Request);
+ /**
+ * Request constructor
+ *
+ * @param {Object} options
+ * @package
+ */
+ function Request(uri, opts) {
+ var _this8;
+ _classCallCheck(this, Request);
+ _this8 = _super2.call(this);
+ installTimerFunctions(_assertThisInitialized(_this8), opts);
+ _this8.opts = opts;
+ _this8.method = opts.method || "GET";
+ _this8.uri = uri;
+ _this8.data = undefined !== opts.data ? opts.data : null;
+ _this8.create();
+ return _this8;
+ }
+ /**
+ * Creates the XHR object and sends the request.
+ *
+ * @private
+ */
+ _createClass(Request, [
+ {
+ key: "create",
+ value: function create() {
+ var _this9 = this;
+ var _a;
+ var opts = pick(
+ this.opts,
+ "agent",
+ "pfx",
+ "key",
+ "passphrase",
+ "cert",
+ "ca",
+ "ciphers",
+ "rejectUnauthorized",
+ "autoUnref",
+ );
+ opts.xdomain = !!this.opts.xd;
+ var xhr = (this.xhr = new XHR(opts));
+ try {
+ xhr.open(this.method, this.uri, true);
+ try {
+ if (this.opts.extraHeaders) {
+ xhr.setDisableHeaderCheck && xhr.setDisableHeaderCheck(true);
+ for (var i in this.opts.extraHeaders) {
+ if (this.opts.extraHeaders.hasOwnProperty(i)) {
+ xhr.setRequestHeader(i, this.opts.extraHeaders[i]);
+ }
+ }
+ }
+ } catch (e) {}
+ if ("POST" === this.method) {
+ try {
+ xhr.setRequestHeader(
+ "Content-type",
+ "text/plain;charset=UTF-8",
+ );
+ } catch (e) {}
+ }
+ try {
+ xhr.setRequestHeader("Accept", "*/*");
+ } catch (e) {}
+ (_a = this.opts.cookieJar) === null || _a === void 0
+ ? void 0
+ : _a.addCookies(xhr);
+ // ie6 check
+ if ("withCredentials" in xhr) {
+ xhr.withCredentials = this.opts.withCredentials;
+ }
+ if (this.opts.requestTimeout) {
+ xhr.timeout = this.opts.requestTimeout;
+ }
+ xhr.onreadystatechange = function () {
+ var _a;
+ if (xhr.readyState === 3) {
+ (_a = _this9.opts.cookieJar) === null || _a === void 0
+ ? void 0
+ : _a.parseCookies(xhr);
+ }
+ if (4 !== xhr.readyState) return;
+ if (200 === xhr.status || 1223 === xhr.status) {
+ _this9.onLoad();
+ } else {
+ // make sure the `error` event handler that's user-set
+ // does not throw in the same tick and gets caught here
+ _this9.setTimeoutFn(function () {
+ _this9.onError(
+ typeof xhr.status === "number" ? xhr.status : 0,
+ );
+ }, 0);
+ }
+ };
+ xhr.send(this.data);
+ } catch (e) {
+ // Need to defer since .create() is called directly from the constructor
+ // and thus the 'error' event can only be only bound *after* this exception
+ // occurs. Therefore, also, we cannot throw here at all.
+ this.setTimeoutFn(function () {
+ _this9.onError(e);
+ }, 0);
+ return;
+ }
+ if (typeof document !== "undefined") {
+ this.index = Request.requestsCount++;
+ Request.requests[this.index] = this;
+ }
+ },
+ /**
+ * Called upon error.
+ *
+ * @private
+ */
+ },
+ {
+ key: "onError",
+ value: function onError(err) {
+ this.emitReserved("error", err, this.xhr);
+ this.cleanup(true);
+ },
+ /**
+ * Cleans up house.
+ *
+ * @private
+ */
+ },
+ {
+ key: "cleanup",
+ value: function cleanup(fromError) {
+ if ("undefined" === typeof this.xhr || null === this.xhr) {
+ return;
+ }
+ this.xhr.onreadystatechange = empty;
+ if (fromError) {
+ try {
+ this.xhr.abort();
+ } catch (e) {}
+ }
+ if (typeof document !== "undefined") {
+ delete Request.requests[this.index];
+ }
+ this.xhr = null;
+ },
+ /**
+ * Called upon load.
+ *
+ * @private
+ */
+ },
+ {
+ key: "onLoad",
+ value: function onLoad() {
+ var data = this.xhr.responseText;
+ if (data !== null) {
+ this.emitReserved("data", data);
+ this.emitReserved("success");
+ this.cleanup();
+ }
+ },
+ /**
+ * Aborts the request.
+ *
+ * @package
+ */
+ },
+ {
+ key: "abort",
+ value: function abort() {
+ this.cleanup();
+ },
+ },
+ ]);
+ return Request;
+ })(Emitter);
+ Request.requestsCount = 0;
+ Request.requests = {};
+ /**
+ * Aborts pending requests when unloading the window. This is needed to prevent
+ * memory leaks (e.g. when using IE) and to ensure that no spurious error is
+ * emitted.
+ */
+ if (typeof document !== "undefined") {
+ // @ts-ignore
+ if (typeof attachEvent === "function") {
+ // @ts-ignore
+ attachEvent("onunload", unloadHandler);
+ } else if (typeof addEventListener === "function") {
+ var terminationEvent =
+ "onpagehide" in globalThisShim ? "pagehide" : "unload";
+ addEventListener(terminationEvent, unloadHandler, false);
+ }
+ }
+ function unloadHandler() {
+ for (var i in Request.requests) {
+ if (Request.requests.hasOwnProperty(i)) {
+ Request.requests[i].abort();
+ }
+ }
+ }
+
+ var nextTick = (function () {
+ var isPromiseAvailable =
+ typeof Promise === "function" && typeof Promise.resolve === "function";
+ if (isPromiseAvailable) {
+ return function (cb) {
+ return Promise.resolve().then(cb);
+ };
+ } else {
+ return function (cb, setTimeoutFn) {
+ return setTimeoutFn(cb, 0);
+ };
+ }
+ })();
+ var WebSocket = globalThisShim.WebSocket || globalThisShim.MozWebSocket;
+ var usingBrowserWebSocket = true;
+ var defaultBinaryType = "arraybuffer";
+
+ // detect ReactNative environment
+ var isReactNative =
+ typeof navigator !== "undefined" &&
+ typeof navigator.product === "string" &&
+ navigator.product.toLowerCase() === "reactnative";
+ var WS = /*#__PURE__*/ (function (_Transport) {
+ _inherits(WS, _Transport);
+ var _super = _createSuper(WS);
+ /**
+ * WebSocket transport constructor.
+ *
+ * @param {Object} opts - connection options
+ * @protected
+ */
+ function WS(opts) {
+ var _this;
+ _classCallCheck(this, WS);
+ _this = _super.call(this, opts);
+ _this.supportsBinary = !opts.forceBase64;
+ return _this;
+ }
+ _createClass(WS, [
+ {
+ key: "name",
+ get: function get() {
+ return "websocket";
+ },
+ },
+ {
+ key: "doOpen",
+ value: function doOpen() {
+ if (!this.check()) {
+ // let probe timeout
+ return;
+ }
+ var uri = this.uri();
+ var protocols = this.opts.protocols;
+ // React Native only supports the 'headers' option, and will print a warning if anything else is passed
+ var opts = isReactNative
+ ? {}
+ : pick(
+ this.opts,
+ "agent",
+ "perMessageDeflate",
+ "pfx",
+ "key",
+ "passphrase",
+ "cert",
+ "ca",
+ "ciphers",
+ "rejectUnauthorized",
+ "localAddress",
+ "protocolVersion",
+ "origin",
+ "maxPayload",
+ "family",
+ "checkServerIdentity",
+ );
+ if (this.opts.extraHeaders) {
+ opts.headers = this.opts.extraHeaders;
+ }
+ try {
+ this.ws =
+ usingBrowserWebSocket && !isReactNative
+ ? protocols
+ ? new WebSocket(uri, protocols)
+ : new WebSocket(uri)
+ : new WebSocket(uri, protocols, opts);
+ } catch (err) {
+ return this.emitReserved("error", err);
+ }
+ this.ws.binaryType = this.socket.binaryType;
+ this.addEventListeners();
+ },
+ /**
+ * Adds event listeners to the socket
+ *
+ * @private
+ */
+ },
+ {
+ key: "addEventListeners",
+ value: function addEventListeners() {
+ var _this2 = this;
+ this.ws.onopen = function () {
+ if (_this2.opts.autoUnref) {
+ _this2.ws._socket.unref();
+ }
+ _this2.onOpen();
+ };
+ this.ws.onclose = function (closeEvent) {
+ return _this2.onClose({
+ description: "websocket connection closed",
+ context: closeEvent,
+ });
+ };
+ this.ws.onmessage = function (ev) {
+ return _this2.onData(ev.data);
+ };
+ this.ws.onerror = function (e) {
+ return _this2.onError("websocket error", e);
+ };
+ },
+ },
+ {
+ key: "write",
+ value: function write(packets) {
+ var _this3 = this;
+ this.writable = false;
+ // encodePacket efficient as it uses WS framing
+ // no need for encodePayload
+ var _loop = function _loop() {
+ var packet = packets[i];
+ var lastPacket = i === packets.length - 1;
+ encodePacket(packet, _this3.supportsBinary, function (data) {
+ // always create a new object (GH-437)
+ var opts = {};
+ // Sometimes the websocket has already been closed but the browser didn't
+ // have a chance of informing us about it yet, in that case send will
+ // throw an error
+ try {
+ if (usingBrowserWebSocket) {
+ // TypeError is thrown when passing the second argument on Safari
+ _this3.ws.send(data);
+ }
+ } catch (e) {}
+ if (lastPacket) {
+ // fake drain
+ // defer to next tick to allow Socket to clear writeBuffer
+ nextTick(function () {
+ _this3.writable = true;
+ _this3.emitReserved("drain");
+ }, _this3.setTimeoutFn);
+ }
+ });
+ };
+ for (var i = 0; i < packets.length; i++) {
+ _loop();
+ }
+ },
+ },
+ {
+ key: "doClose",
+ value: function doClose() {
+ if (typeof this.ws !== "undefined") {
+ this.ws.close();
+ this.ws = null;
+ }
+ },
+ /**
+ * Generates uri for connection.
+ *
+ * @private
+ */
+ },
+ {
+ key: "uri",
+ value: function uri() {
+ var schema = this.opts.secure ? "wss" : "ws";
+ var query = this.query || {};
+ // append timestamp to URI
+ if (this.opts.timestampRequests) {
+ query[this.opts.timestampParam] = yeast();
+ }
+ // communicate binary support capabilities
+ if (!this.supportsBinary) {
+ query.b64 = 1;
+ }
+ return this.createUri(schema, query);
+ },
+ /**
+ * Feature detection for WebSocket.
+ *
+ * @return {Boolean} whether this transport is available.
+ * @private
+ */
+ },
+ {
+ key: "check",
+ value: function check() {
+ return !!WebSocket;
+ },
+ },
+ ]);
+ return WS;
+ })(Transport);
+
+ var WT = /*#__PURE__*/ (function (_Transport) {
+ _inherits(WT, _Transport);
+ var _super = _createSuper(WT);
+ function WT() {
+ _classCallCheck(this, WT);
+ return _super.apply(this, arguments);
+ }
+ _createClass(WT, [
+ {
+ key: "name",
+ get: function get() {
+ return "webtransport";
+ },
+ },
+ {
+ key: "doOpen",
+ value: function doOpen() {
+ var _this = this;
+ // @ts-ignore
+ if (typeof WebTransport !== "function") {
+ return;
+ }
+ // @ts-ignore
+ this.transport = new WebTransport(
+ this.createUri("https"),
+ this.opts.transportOptions[this.name],
+ );
+ this.transport.closed
+ .then(function () {
+ _this.onClose();
+ })
+ ["catch"](function (err) {
+ _this.onError("webtransport error", err);
+ });
+ // note: we could have used async/await, but that would require some additional polyfills
+ this.transport.ready.then(function () {
+ _this.transport.createBidirectionalStream().then(function (stream) {
+ var decoderStream = createPacketDecoderStream(
+ Number.MAX_SAFE_INTEGER,
+ _this.socket.binaryType,
+ );
+ var reader = stream.readable
+ .pipeThrough(decoderStream)
+ .getReader();
+ var encoderStream = createPacketEncoderStream();
+ encoderStream.readable.pipeTo(stream.writable);
+ _this.writer = encoderStream.writable.getWriter();
+ var read = function read() {
+ reader
+ .read()
+ .then(function (_ref) {
+ var done = _ref.done,
+ value = _ref.value;
+ if (done) {
+ return;
+ }
+ _this.onPacket(value);
+ read();
+ })
+ ["catch"](function (err) {});
+ };
+ read();
+ var packet = {
+ type: "open",
+ };
+ if (_this.query.sid) {
+ packet.data = '{"sid":"'.concat(_this.query.sid, '"}');
+ }
+ _this.writer.write(packet).then(function () {
+ return _this.onOpen();
+ });
+ });
+ });
+ },
+ },
+ {
+ key: "write",
+ value: function write(packets) {
+ var _this2 = this;
+ this.writable = false;
+ var _loop = function _loop() {
+ var packet = packets[i];
+ var lastPacket = i === packets.length - 1;
+ _this2.writer.write(packet).then(function () {
+ if (lastPacket) {
+ nextTick(function () {
+ _this2.writable = true;
+ _this2.emitReserved("drain");
+ }, _this2.setTimeoutFn);
+ }
+ });
+ };
+ for (var i = 0; i < packets.length; i++) {
+ _loop();
+ }
+ },
+ },
+ {
+ key: "doClose",
+ value: function doClose() {
+ var _a;
+ (_a = this.transport) === null || _a === void 0 ? void 0 : _a.close();
+ },
+ },
+ ]);
+ return WT;
+ })(Transport);
+
+ var transports = {
+ websocket: WS,
+ webtransport: WT,
+ polling: Polling,
+ };
+
+ // imported from https://github.com/galkn/parseuri
+ /**
+ * Parses a URI
+ *
+ * Note: we could also have used the built-in URL object, but it isn't supported on all platforms.
+ *
+ * See:
+ * - https://developer.mozilla.org/en-US/docs/Web/API/URL
+ * - https://caniuse.com/url
+ * - https://www.rfc-editor.org/rfc/rfc3986#appendix-B
+ *
+ * History of the parse() method:
+ * - first commit: https://github.com/socketio/socket.io-client/commit/4ee1d5d94b3906a9c052b459f1a818b15f38f91c
+ * - export into its own module: https://github.com/socketio/engine.io-client/commit/de2c561e4564efeb78f1bdb1ba39ef81b2822cb3
+ * - reimport: https://github.com/socketio/engine.io-client/commit/df32277c3f6d622eec5ed09f493cae3f3391d242
+ *
+ * @author Steven Levithan <stevenlevithan.com> (MIT license)
+ * @api private
+ */
+ var re =
+ /^(?:(?![^:@\/?#]+:[^:@\/]*@)(http|https|ws|wss):\/\/)?((?:(([^:@\/?#]*)(?::([^:@\/?#]*))?)?@)?((?:[a-f0-9]{0,4}:){2,7}[a-f0-9]{0,4}|[^:\/?#]*)(?::(\d*))?)(((\/(?:[^?#](?![^?#\/]*\.[^?#\/.]+(?:[?#]|$)))*\/?)?([^?#\/]*))(?:\?([^#]*))?(?:#(.*))?)/;
+ var parts = [
+ "source",
+ "protocol",
+ "authority",
+ "userInfo",
+ "user",
+ "password",
+ "host",
+ "port",
+ "relative",
+ "path",
+ "directory",
+ "file",
+ "query",
+ "anchor",
+ ];
+ function parse(str) {
+ var src = str,
+ b = str.indexOf("["),
+ e = str.indexOf("]");
+ if (b != -1 && e != -1) {
+ str =
+ str.substring(0, b) +
+ str.substring(b, e).replace(/:/g, ";") +
+ str.substring(e, str.length);
+ }
+ var m = re.exec(str || ""),
+ uri = {},
+ i = 14;
+ while (i--) {
+ uri[parts[i]] = m[i] || "";
+ }
+ if (b != -1 && e != -1) {
+ uri.source = src;
+ uri.host = uri.host.substring(1, uri.host.length - 1).replace(/;/g, ":");
+ uri.authority = uri.authority
+ .replace("[", "")
+ .replace("]", "")
+ .replace(/;/g, ":");
+ uri.ipv6uri = true;
+ }
+ uri.pathNames = pathNames(uri, uri["path"]);
+ uri.queryKey = queryKey(uri, uri["query"]);
+ return uri;
+ }
+ function pathNames(obj, path) {
+ var regx = /\/{2,9}/g,
+ names = path.replace(regx, "/").split("/");
+ if (path.slice(0, 1) == "/" || path.length === 0) {
+ names.splice(0, 1);
+ }
+ if (path.slice(-1) == "/") {
+ names.splice(names.length - 1, 1);
+ }
+ return names;
+ }
+ function queryKey(uri, query) {
+ var data = {};
+ query.replace(/(?:^|&)([^&=]*)=?([^&]*)/g, function ($0, $1, $2) {
+ if ($1) {
+ data[$1] = $2;
+ }
+ });
+ return data;
+ }
+
+ var Socket$1 = /*#__PURE__*/ (function (_Emitter) {
+ _inherits(Socket, _Emitter);
+ var _super = _createSuper(Socket);
+ /**
+ * Socket constructor.
+ *
+ * @param {String|Object} uri - uri or options
+ * @param {Object} opts - options
+ */
+ function Socket(uri) {
+ var _this;
+ var opts =
+ arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
+ _classCallCheck(this, Socket);
+ _this = _super.call(this);
+ _this.binaryType = defaultBinaryType;
+ _this.writeBuffer = [];
+ if (uri && "object" === _typeof(uri)) {
+ opts = uri;
+ uri = null;
+ }
+ if (uri) {
+ uri = parse(uri);
+ opts.hostname = uri.host;
+ opts.secure = uri.protocol === "https" || uri.protocol === "wss";
+ opts.port = uri.port;
+ if (uri.query) opts.query = uri.query;
+ } else if (opts.host) {
+ opts.hostname = parse(opts.host).host;
+ }
+ installTimerFunctions(_assertThisInitialized(_this), opts);
+ _this.secure =
+ null != opts.secure
+ ? opts.secure
+ : typeof location !== "undefined" && "https:" === location.protocol;
+ if (opts.hostname && !opts.port) {
+ // if no port is specified manually, use the protocol default
+ opts.port = _this.secure ? "443" : "80";
+ }
+ _this.hostname =
+ opts.hostname ||
+ (typeof location !== "undefined" ? location.hostname : "localhost");
+ _this.port =
+ opts.port ||
+ (typeof location !== "undefined" && location.port
+ ? location.port
+ : _this.secure
+ ? "443"
+ : "80");
+ _this.transports = opts.transports || [
+ "polling",
+ "websocket",
+ "webtransport",
+ ];
+ _this.writeBuffer = [];
+ _this.prevBufferLen = 0;
+ _this.opts = _extends(
+ {
+ path: "/engine.io",
+ agent: false,
+ withCredentials: false,
+ upgrade: true,
+ timestampParam: "t",
+ rememberUpgrade: false,
+ addTrailingSlash: true,
+ rejectUnauthorized: true,
+ perMessageDeflate: {
+ threshold: 1024,
+ },
+ transportOptions: {},
+ closeOnBeforeunload: false,
+ },
+ opts,
+ );
+ _this.opts.path =
+ _this.opts.path.replace(/\/$/, "") +
+ (_this.opts.addTrailingSlash ? "/" : "");
+ if (typeof _this.opts.query === "string") {
+ _this.opts.query = decode(_this.opts.query);
+ }
+ // set on handshake
+ _this.id = null;
+ _this.upgrades = null;
+ _this.pingInterval = null;
+ _this.pingTimeout = null;
+ // set on heartbeat
+ _this.pingTimeoutTimer = null;
+ if (typeof addEventListener === "function") {
+ if (_this.opts.closeOnBeforeunload) {
+ // Firefox closes the connection when the "beforeunload" event is emitted but not Chrome. This event listener
+ // ensures every browser behaves the same (no "disconnect" event at the Socket.IO level when the page is
+ // closed/reloaded)
+ _this.beforeunloadEventListener = function () {
+ if (_this.transport) {
+ // silently close the transport
+ _this.transport.removeAllListeners();
+ _this.transport.close();
+ }
+ };
+ addEventListener(
+ "beforeunload",
+ _this.beforeunloadEventListener,
+ false,
+ );
+ }
+ if (_this.hostname !== "localhost") {
+ _this.offlineEventListener = function () {
+ _this.onClose("transport close", {
+ description: "network connection lost",
+ });
+ };
+ addEventListener("offline", _this.offlineEventListener, false);
+ }
+ }
+ _this.open();
+ return _this;
+ }
+ /**
+ * Creates transport of the given type.
+ *
+ * @param {String} name - transport name
+ * @return {Transport}
+ * @private
+ */
+ _createClass(Socket, [
+ {
+ key: "createTransport",
+ value: function createTransport(name) {
+ var query = _extends({}, this.opts.query);
+ // append engine.io protocol identifier
+ query.EIO = protocol$1;
+ // transport name
+ query.transport = name;
+ // session id if we already have one
+ if (this.id) query.sid = this.id;
+ var opts = _extends(
+ {},
+ this.opts,
+ {
+ query: query,
+ socket: this,
+ hostname: this.hostname,
+ secure: this.secure,
+ port: this.port,
+ },
+ this.opts.transportOptions[name],
+ );
+ return new transports[name](opts);
+ },
+ /**
+ * Initializes transport to use and starts probe.
+ *
+ * @private
+ */
+ },
+ {
+ key: "open",
+ value: function open() {
+ var _this2 = this;
+ var transport;
+ if (
+ this.opts.rememberUpgrade &&
+ Socket.priorWebsocketSuccess &&
+ this.transports.indexOf("websocket") !== -1
+ ) {
+ transport = "websocket";
+ } else if (0 === this.transports.length) {
+ // Emit error on next tick so it can be listened to
+ this.setTimeoutFn(function () {
+ _this2.emitReserved("error", "No transports available");
+ }, 0);
+ return;
+ } else {
+ transport = this.transports[0];
+ }
+ this.readyState = "opening";
+ // Retry with the next transport if the transport is disabled (jsonp: false)
+ try {
+ transport = this.createTransport(transport);
+ } catch (e) {
+ this.transports.shift();
+ this.open();
+ return;
+ }
+ transport.open();
+ this.setTransport(transport);
+ },
+ /**
+ * Sets the current transport. Disables the existing one (if any).
+ *
+ * @private
+ */
+ },
+ {
+ key: "setTransport",
+ value: function setTransport(transport) {
+ var _this3 = this;
+ if (this.transport) {
+ this.transport.removeAllListeners();
+ }
+ // set up transport
+ this.transport = transport;
+ // set up transport listeners
+ transport
+ .on("drain", this.onDrain.bind(this))
+ .on("packet", this.onPacket.bind(this))
+ .on("error", this.onError.bind(this))
+ .on("close", function (reason) {
+ return _this3.onClose("transport close", reason);
+ });
+ },
+ /**
+ * Probes a transport.
+ *
+ * @param {String} name - transport name
+ * @private
+ */
+ },
+ {
+ key: "probe",
+ value: function probe(name) {
+ var _this4 = this;
+ var transport = this.createTransport(name);
+ var failed = false;
+ Socket.priorWebsocketSuccess = false;
+ var onTransportOpen = function onTransportOpen() {
+ if (failed) return;
+ transport.send([
+ {
+ type: "ping",
+ data: "probe",
+ },
+ ]);
+ transport.once("packet", function (msg) {
+ if (failed) return;
+ if ("pong" === msg.type && "probe" === msg.data) {
+ _this4.upgrading = true;
+ _this4.emitReserved("upgrading", transport);
+ if (!transport) return;
+ Socket.priorWebsocketSuccess = "websocket" === transport.name;
+ _this4.transport.pause(function () {
+ if (failed) return;
+ if ("closed" === _this4.readyState) return;
+ cleanup();
+ _this4.setTransport(transport);
+ transport.send([
+ {
+ type: "upgrade",
+ },
+ ]);
+ _this4.emitReserved("upgrade", transport);
+ transport = null;
+ _this4.upgrading = false;
+ _this4.flush();
+ });
+ } else {
+ var err = new Error("probe error");
+ // @ts-ignore
+ err.transport = transport.name;
+ _this4.emitReserved("upgradeError", err);
+ }
+ });
+ };
+ function freezeTransport() {
+ if (failed) return;
+ // Any callback called by transport should be ignored since now
+ failed = true;
+ cleanup();
+ transport.close();
+ transport = null;
+ }
+ // Handle any error that happens while probing
+ var onerror = function onerror(err) {
+ var error = new Error("probe error: " + err);
+ // @ts-ignore
+ error.transport = transport.name;
+ freezeTransport();
+ _this4.emitReserved("upgradeError", error);
+ };
+ function onTransportClose() {
+ onerror("transport closed");
+ }
+ // When the socket is closed while we're probing
+ function onclose() {
+ onerror("socket closed");
+ }
+ // When the socket is upgraded while we're probing
+ function onupgrade(to) {
+ if (transport && to.name !== transport.name) {
+ freezeTransport();
+ }
+ }
+ // Remove all listeners on the transport and on self
+ var cleanup = function cleanup() {
+ transport.removeListener("open", onTransportOpen);
+ transport.removeListener("error", onerror);
+ transport.removeListener("close", onTransportClose);
+ _this4.off("close", onclose);
+ _this4.off("upgrading", onupgrade);
+ };
+ transport.once("open", onTransportOpen);
+ transport.once("error", onerror);
+ transport.once("close", onTransportClose);
+ this.once("close", onclose);
+ this.once("upgrading", onupgrade);
+ if (
+ this.upgrades.indexOf("webtransport") !== -1 &&
+ name !== "webtransport"
+ ) {
+ // favor WebTransport
+ this.setTimeoutFn(function () {
+ if (!failed) {
+ transport.open();
+ }
+ }, 200);
+ } else {
+ transport.open();
+ }
+ },
+ /**
+ * Called when connection is deemed open.
+ *
+ * @private
+ */
+ },
+ {
+ key: "onOpen",
+ value: function onOpen() {
+ this.readyState = "open";
+ Socket.priorWebsocketSuccess = "websocket" === this.transport.name;
+ this.emitReserved("open");
+ this.flush();
+ // we check for `readyState` in case an `open`
+ // listener already closed the socket
+ if ("open" === this.readyState && this.opts.upgrade) {
+ var i = 0;
+ var l = this.upgrades.length;
+ for (; i < l; i++) {
+ this.probe(this.upgrades[i]);
+ }
+ }
+ },
+ /**
+ * Handles a packet.
+ *
+ * @private
+ */
+ },
+ {
+ key: "onPacket",
+ value: function onPacket(packet) {
+ if (
+ "opening" === this.readyState ||
+ "open" === this.readyState ||
+ "closing" === this.readyState
+ ) {
+ this.emitReserved("packet", packet);
+ // Socket is live - any packet counts
+ this.emitReserved("heartbeat");
+ this.resetPingTimeout();
+ switch (packet.type) {
+ case "open":
+ this.onHandshake(JSON.parse(packet.data));
+ break;
+ case "ping":
+ this.sendPacket("pong");
+ this.emitReserved("ping");
+ this.emitReserved("pong");
+ break;
+ case "error":
+ var err = new Error("server error");
+ // @ts-ignore
+ err.code = packet.data;
+ this.onError(err);
+ break;
+ case "message":
+ this.emitReserved("data", packet.data);
+ this.emitReserved("message", packet.data);
+ break;
+ }
+ }
+ },
+ /**
+ * Called upon handshake completion.
+ *
+ * @param {Object} data - handshake obj
+ * @private
+ */
+ },
+ {
+ key: "onHandshake",
+ value: function onHandshake(data) {
+ this.emitReserved("handshake", data);
+ this.id = data.sid;
+ this.transport.query.sid = data.sid;
+ this.upgrades = this.filterUpgrades(data.upgrades);
+ this.pingInterval = data.pingInterval;
+ this.pingTimeout = data.pingTimeout;
+ this.maxPayload = data.maxPayload;
+ this.onOpen();
+ // In case open handler closes socket
+ if ("closed" === this.readyState) return;
+ this.resetPingTimeout();
+ },
+ /**
+ * Sets and resets ping timeout timer based on server pings.
+ *
+ * @private
+ */
+ },
+ {
+ key: "resetPingTimeout",
+ value: function resetPingTimeout() {
+ var _this5 = this;
+ this.clearTimeoutFn(this.pingTimeoutTimer);
+ this.pingTimeoutTimer = this.setTimeoutFn(function () {
+ _this5.onClose("ping timeout");
+ }, this.pingInterval + this.pingTimeout);
+ if (this.opts.autoUnref) {
+ this.pingTimeoutTimer.unref();
+ }
+ },
+ /**
+ * Called on `drain` event
+ *
+ * @private
+ */
+ },
+ {
+ key: "onDrain",
+ value: function onDrain() {
+ this.writeBuffer.splice(0, this.prevBufferLen);
+ // setting prevBufferLen = 0 is very important
+ // for example, when upgrading, upgrade packet is sent over,
+ // and a nonzero prevBufferLen could cause problems on `drain`
+ this.prevBufferLen = 0;
+ if (0 === this.writeBuffer.length) {
+ this.emitReserved("drain");
+ } else {
+ this.flush();
+ }
+ },
+ /**
+ * Flush write buffers.
+ *
+ * @private
+ */
+ },
+ {
+ key: "flush",
+ value: function flush() {
+ if (
+ "closed" !== this.readyState &&
+ this.transport.writable &&
+ !this.upgrading &&
+ this.writeBuffer.length
+ ) {
+ var packets = this.getWritablePackets();
+ this.transport.send(packets);
+ // keep track of current length of writeBuffer
+ // splice writeBuffer and callbackBuffer on `drain`
+ this.prevBufferLen = packets.length;
+ this.emitReserved("flush");
+ }
+ },
+ /**
+ * Ensure the encoded size of the writeBuffer is below the maxPayload value sent by the server (only for HTTP
+ * long-polling)
+ *
+ * @private
+ */
+ },
+ {
+ key: "getWritablePackets",
+ value: function getWritablePackets() {
+ var shouldCheckPayloadSize =
+ this.maxPayload &&
+ this.transport.name === "polling" &&
+ this.writeBuffer.length > 1;
+ if (!shouldCheckPayloadSize) {
+ return this.writeBuffer;
+ }
+ var payloadSize = 1; // first packet type
+ for (var i = 0; i < this.writeBuffer.length; i++) {
+ var data = this.writeBuffer[i].data;
+ if (data) {
+ payloadSize += byteLength(data);
+ }
+ if (i > 0 && payloadSize > this.maxPayload) {
+ return this.writeBuffer.slice(0, i);
+ }
+ payloadSize += 2; // separator + packet type
+ }
+
+ return this.writeBuffer;
+ },
+ /**
+ * Sends a message.
+ *
+ * @param {String} msg - message.
+ * @param {Object} options.
+ * @param {Function} callback function.
+ * @return {Socket} for chaining.
+ */
+ },
+ {
+ key: "write",
+ value: function write(msg, options, fn) {
+ this.sendPacket("message", msg, options, fn);
+ return this;
+ },
+ },
+ {
+ key: "send",
+ value: function send(msg, options, fn) {
+ this.sendPacket("message", msg, options, fn);
+ return this;
+ },
+ /**
+ * Sends a packet.
+ *
+ * @param {String} type: packet type.
+ * @param {String} data.
+ * @param {Object} options.
+ * @param {Function} fn - callback function.
+ * @private
+ */
+ },
+ {
+ key: "sendPacket",
+ value: function sendPacket(type, data, options, fn) {
+ if ("function" === typeof data) {
+ fn = data;
+ data = undefined;
+ }
+ if ("function" === typeof options) {
+ fn = options;
+ options = null;
+ }
+ if ("closing" === this.readyState || "closed" === this.readyState) {
+ return;
+ }
+ options = options || {};
+ options.compress = false !== options.compress;
+ var packet = {
+ type: type,
+ data: data,
+ options: options,
+ };
+ this.emitReserved("packetCreate", packet);
+ this.writeBuffer.push(packet);
+ if (fn) this.once("flush", fn);
+ this.flush();
+ },
+ /**
+ * Closes the connection.
+ */
+ },
+ {
+ key: "close",
+ value: function close() {
+ var _this6 = this;
+ var close = function close() {
+ _this6.onClose("forced close");
+ _this6.transport.close();
+ };
+ var cleanupAndClose = function cleanupAndClose() {
+ _this6.off("upgrade", cleanupAndClose);
+ _this6.off("upgradeError", cleanupAndClose);
+ close();
+ };
+ var waitForUpgrade = function waitForUpgrade() {
+ // wait for upgrade to finish since we can't send packets while pausing a transport
+ _this6.once("upgrade", cleanupAndClose);
+ _this6.once("upgradeError", cleanupAndClose);
+ };
+ if ("opening" === this.readyState || "open" === this.readyState) {
+ this.readyState = "closing";
+ if (this.writeBuffer.length) {
+ this.once("drain", function () {
+ if (_this6.upgrading) {
+ waitForUpgrade();
+ } else {
+ close();
+ }
+ });
+ } else if (this.upgrading) {
+ waitForUpgrade();
+ } else {
+ close();
+ }
+ }
+ return this;
+ },
+ /**
+ * Called upon transport error
+ *
+ * @private
+ */
+ },
+ {
+ key: "onError",
+ value: function onError(err) {
+ Socket.priorWebsocketSuccess = false;
+ this.emitReserved("error", err);
+ this.onClose("transport error", err);
+ },
+ /**
+ * Called upon transport close.
+ *
+ * @private
+ */
+ },
+ {
+ key: "onClose",
+ value: function onClose(reason, description) {
+ if (
+ "opening" === this.readyState ||
+ "open" === this.readyState ||
+ "closing" === this.readyState
+ ) {
+ // clear timers
+ this.clearTimeoutFn(this.pingTimeoutTimer);
+ // stop event from firing again for transport
+ this.transport.removeAllListeners("close");
+ // ensure transport won't stay open
+ this.transport.close();
+ // ignore further transport communication
+ this.transport.removeAllListeners();
+ if (typeof removeEventListener === "function") {
+ removeEventListener(
+ "beforeunload",
+ this.beforeunloadEventListener,
+ false,
+ );
+ removeEventListener("offline", this.offlineEventListener, false);
+ }
+ // set ready state
+ this.readyState = "closed";
+ // clear session id
+ this.id = null;
+ // emit close event
+ this.emitReserved("close", reason, description);
+ // clean buffers after, so users can still
+ // grab the buffers on `close` event
+ this.writeBuffer = [];
+ this.prevBufferLen = 0;
+ }
+ },
+ /**
+ * Filters upgrades, returning only those matching client transports.
+ *
+ * @param {Array} upgrades - server upgrades
+ * @private
+ */
+ },
+ {
+ key: "filterUpgrades",
+ value: function filterUpgrades(upgrades) {
+ var filteredUpgrades = [];
+ var i = 0;
+ var j = upgrades.length;
+ for (; i < j; i++) {
+ if (~this.transports.indexOf(upgrades[i]))
+ filteredUpgrades.push(upgrades[i]);
+ }
+ return filteredUpgrades;
+ },
+ },
+ ]);
+ return Socket;
+ })(Emitter);
+ Socket$1.protocol = protocol$1;
+
+ Socket$1.protocol;
+
+ /**
+ * URL parser.
+ *
+ * @param uri - url
+ * @param path - the request path of the connection
+ * @param loc - An object meant to mimic window.location.
+ * Defaults to window.location.
+ * @public
+ */
+ function url(uri) {
+ var path =
+ arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : "";
+ var loc = arguments.length > 2 ? arguments[2] : undefined;
+ var obj = uri;
+ // default to window.location
+ loc = loc || (typeof location !== "undefined" && location);
+ if (null == uri) uri = loc.protocol + "//" + loc.host;
+ // relative path support
+ if (typeof uri === "string") {
+ if ("/" === uri.charAt(0)) {
+ if ("/" === uri.charAt(1)) {
+ uri = loc.protocol + uri;
+ } else {
+ uri = loc.host + uri;
+ }
+ }
+ if (!/^(https?|wss?):\/\//.test(uri)) {
+ if ("undefined" !== typeof loc) {
+ uri = loc.protocol + "//" + uri;
+ } else {
+ uri = "https://" + uri;
+ }
+ }
+ // parse
+ obj = parse(uri);
+ }
+ // make sure we treat `localhost:80` and `localhost` equally
+ if (!obj.port) {
+ if (/^(http|ws)$/.test(obj.protocol)) {
+ obj.port = "80";
+ } else if (/^(http|ws)s$/.test(obj.protocol)) {
+ obj.port = "443";
+ }
+ }
+ obj.path = obj.path || "/";
+ var ipv6 = obj.host.indexOf(":") !== -1;
+ var host = ipv6 ? "[" + obj.host + "]" : obj.host;
+ // define unique id
+ obj.id = obj.protocol + "://" + host + ":" + obj.port + path;
+ // define href
+ obj.href =
+ obj.protocol +
+ "://" +
+ host +
+ (loc && loc.port === obj.port ? "" : ":" + obj.port);
+ return obj;
+ }
+
+ var withNativeArrayBuffer = typeof ArrayBuffer === "function";
+ var isView = function isView(obj) {
+ return typeof ArrayBuffer.isView === "function"
+ ? ArrayBuffer.isView(obj)
+ : obj.buffer instanceof ArrayBuffer;
+ };
+ var toString = Object.prototype.toString;
+ var withNativeBlob =
+ typeof Blob === "function" ||
+ (typeof Blob !== "undefined" &&
+ toString.call(Blob) === "[object BlobConstructor]");
+ var withNativeFile =
+ typeof File === "function" ||
+ (typeof File !== "undefined" &&
+ toString.call(File) === "[object FileConstructor]");
+ /**
+ * Returns true if obj is a Buffer, an ArrayBuffer, a Blob or a File.
+ *
+ * @private
+ */
+ function isBinary(obj) {
+ return (
+ (withNativeArrayBuffer && (obj instanceof ArrayBuffer || isView(obj))) ||
+ (withNativeBlob && obj instanceof Blob) ||
+ (withNativeFile && obj instanceof File)
+ );
+ }
+ function hasBinary(obj, toJSON) {
+ if (!obj || _typeof(obj) !== "object") {
+ return false;
+ }
+ if (Array.isArray(obj)) {
+ for (var i = 0, l = obj.length; i < l; i++) {
+ if (hasBinary(obj[i])) {
+ return true;
+ }
+ }
+ return false;
+ }
+ if (isBinary(obj)) {
+ return true;
+ }
+ if (
+ obj.toJSON &&
+ typeof obj.toJSON === "function" &&
+ arguments.length === 1
+ ) {
+ return hasBinary(obj.toJSON(), true);
+ }
+ for (var key in obj) {
+ if (
+ Object.prototype.hasOwnProperty.call(obj, key) &&
+ hasBinary(obj[key])
+ ) {
+ return true;
+ }
+ }
+ return false;
+ }
+
+ /**
+ * Replaces every Buffer | ArrayBuffer | Blob | File in packet with a numbered placeholder.
+ *
+ * @param {Object} packet - socket.io event packet
+ * @return {Object} with deconstructed packet and list of buffers
+ * @public
+ */
+ function deconstructPacket(packet) {
+ var buffers = [];
+ var packetData = packet.data;
+ var pack = packet;
+ pack.data = _deconstructPacket(packetData, buffers);
+ pack.attachments = buffers.length; // number of binary 'attachments'
+ return {
+ packet: pack,
+ buffers: buffers,
+ };
+ }
+ function _deconstructPacket(data, buffers) {
+ if (!data) return data;
+ if (isBinary(data)) {
+ var placeholder = {
+ _placeholder: true,
+ num: buffers.length,
+ };
+ buffers.push(data);
+ return placeholder;
+ } else if (Array.isArray(data)) {
+ var newData = new Array(data.length);
+ for (var i = 0; i < data.length; i++) {
+ newData[i] = _deconstructPacket(data[i], buffers);
+ }
+ return newData;
+ } else if (_typeof(data) === "object" && !(data instanceof Date)) {
+ var _newData = {};
+ for (var key in data) {
+ if (Object.prototype.hasOwnProperty.call(data, key)) {
+ _newData[key] = _deconstructPacket(data[key], buffers);
+ }
+ }
+ return _newData;
+ }
+ return data;
+ }
+ /**
+ * Reconstructs a binary packet from its placeholder packet and buffers
+ *
+ * @param {Object} packet - event packet with placeholders
+ * @param {Array} buffers - binary buffers to put in placeholder positions
+ * @return {Object} reconstructed packet
+ * @public
+ */
+ function reconstructPacket(packet, buffers) {
+ packet.data = _reconstructPacket(packet.data, buffers);
+ delete packet.attachments; // no longer useful
+ return packet;
+ }
+ function _reconstructPacket(data, buffers) {
+ if (!data) return data;
+ if (data && data._placeholder === true) {
+ var isIndexValid =
+ typeof data.num === "number" &&
+ data.num >= 0 &&
+ data.num < buffers.length;
+ if (isIndexValid) {
+ return buffers[data.num]; // appropriate buffer (should be natural order anyway)
+ } else {
+ throw new Error("illegal attachments");
+ }
+ } else if (Array.isArray(data)) {
+ for (var i = 0; i < data.length; i++) {
+ data[i] = _reconstructPacket(data[i], buffers);
+ }
+ } else if (_typeof(data) === "object") {
+ for (var key in data) {
+ if (Object.prototype.hasOwnProperty.call(data, key)) {
+ data[key] = _reconstructPacket(data[key], buffers);
+ }
+ }
+ }
+ return data;
+ }
+
+ /**
+ * These strings must not be used as event names, as they have a special meaning.
+ */
+ var RESERVED_EVENTS$1 = [
+ "connect",
+ "connect_error",
+ "disconnect",
+ "disconnecting",
+ "newListener",
+ "removeListener", // used by the Node.js EventEmitter
+ ];
+ /**
+ * Protocol version.
+ *
+ * @public
+ */
+ var protocol = 5;
+ var PacketType;
+ (function (PacketType) {
+ PacketType[(PacketType["CONNECT"] = 0)] = "CONNECT";
+ PacketType[(PacketType["DISCONNECT"] = 1)] = "DISCONNECT";
+ PacketType[(PacketType["EVENT"] = 2)] = "EVENT";
+ PacketType[(PacketType["ACK"] = 3)] = "ACK";
+ PacketType[(PacketType["CONNECT_ERROR"] = 4)] = "CONNECT_ERROR";
+ PacketType[(PacketType["BINARY_EVENT"] = 5)] = "BINARY_EVENT";
+ PacketType[(PacketType["BINARY_ACK"] = 6)] = "BINARY_ACK";
+ })(PacketType || (PacketType = {}));
+ /**
+ * A socket.io Encoder instance
+ */
+ var Encoder = /*#__PURE__*/ (function () {
+ /**
+ * Encoder constructor
+ *
+ * @param {function} replacer - custom replacer to pass down to JSON.parse
+ */
+ function Encoder(replacer) {
+ _classCallCheck(this, Encoder);
+ this.replacer = replacer;
+ }
+ /**
+ * Encode a packet as a single string if non-binary, or as a
+ * buffer sequence, depending on packet type.
+ *
+ * @param {Object} obj - packet object
+ */
+ _createClass(Encoder, [
+ {
+ key: "encode",
+ value: function encode(obj) {
+ if (obj.type === PacketType.EVENT || obj.type === PacketType.ACK) {
+ if (hasBinary(obj)) {
+ return this.encodeAsBinary({
+ type:
+ obj.type === PacketType.EVENT
+ ? PacketType.BINARY_EVENT
+ : PacketType.BINARY_ACK,
+ nsp: obj.nsp,
+ data: obj.data,
+ id: obj.id,
+ });
+ }
+ }
+ return [this.encodeAsString(obj)];
+ },
+ /**
+ * Encode packet as string.
+ */
+ },
+ {
+ key: "encodeAsString",
+ value: function encodeAsString(obj) {
+ // first is type
+ var str = "" + obj.type;
+ // attachments if we have them
+ if (
+ obj.type === PacketType.BINARY_EVENT ||
+ obj.type === PacketType.BINARY_ACK
+ ) {
+ str += obj.attachments + "-";
+ }
+ // if we have a namespace other than `/`
+ // we append it followed by a comma `,`
+ if (obj.nsp && "/" !== obj.nsp) {
+ str += obj.nsp + ",";
+ }
+ // immediately followed by the id
+ if (null != obj.id) {
+ str += obj.id;
+ }
+ // json data
+ if (null != obj.data) {
+ str += JSON.stringify(obj.data, this.replacer);
+ }
+ return str;
+ },
+ /**
+ * Encode packet as 'buffer sequence' by removing blobs, and
+ * deconstructing packet into object with placeholders and
+ * a list of buffers.
+ */
+ },
+ {
+ key: "encodeAsBinary",
+ value: function encodeAsBinary(obj) {
+ var deconstruction = deconstructPacket(obj);
+ var pack = this.encodeAsString(deconstruction.packet);
+ var buffers = deconstruction.buffers;
+ buffers.unshift(pack); // add packet info to beginning of data list
+ return buffers; // write all the buffers
+ },
+ },
+ ]);
+ return Encoder;
+ })();
+ // see https://stackoverflow.com/questions/8511281/check-if-a-value-is-an-object-in-javascript
+ function isObject(value) {
+ return Object.prototype.toString.call(value) === "[object Object]";
+ }
+ /**
+ * A socket.io Decoder instance
+ *
+ * @return {Object} decoder
+ */
+ var Decoder = /*#__PURE__*/ (function (_Emitter) {
+ _inherits(Decoder, _Emitter);
+ var _super = _createSuper(Decoder);
+ /**
+ * Decoder constructor
+ *
+ * @param {function} reviver - custom reviver to pass down to JSON.stringify
+ */
+ function Decoder(reviver) {
+ var _this;
+ _classCallCheck(this, Decoder);
+ _this = _super.call(this);
+ _this.reviver = reviver;
+ return _this;
+ }
+ /**
+ * Decodes an encoded packet string into packet JSON.
+ *
+ * @param {String} obj - encoded packet
+ */
+ _createClass(
+ Decoder,
+ [
+ {
+ key: "add",
+ value: function add(obj) {
+ var packet;
+ if (typeof obj === "string") {
+ if (this.reconstructor) {
+ throw new Error(
+ "got plaintext data when reconstructing a packet",
+ );
+ }
+ packet = this.decodeString(obj);
+ var isBinaryEvent = packet.type === PacketType.BINARY_EVENT;
+ if (isBinaryEvent || packet.type === PacketType.BINARY_ACK) {
+ packet.type = isBinaryEvent ? PacketType.EVENT : PacketType.ACK;
+ // binary packet's json
+ this.reconstructor = new BinaryReconstructor(packet);
+ // no attachments, labeled binary but no binary data to follow
+ if (packet.attachments === 0) {
+ _get(
+ _getPrototypeOf(Decoder.prototype),
+ "emitReserved",
+ this,
+ ).call(this, "decoded", packet);
+ }
+ } else {
+ // non-binary full packet
+ _get(
+ _getPrototypeOf(Decoder.prototype),
+ "emitReserved",
+ this,
+ ).call(this, "decoded", packet);
+ }
+ } else if (isBinary(obj) || obj.base64) {
+ // raw binary data
+ if (!this.reconstructor) {
+ throw new Error(
+ "got binary data when not reconstructing a packet",
+ );
+ } else {
+ packet = this.reconstructor.takeBinaryData(obj);
+ if (packet) {
+ // received final buffer
+ this.reconstructor = null;
+ _get(
+ _getPrototypeOf(Decoder.prototype),
+ "emitReserved",
+ this,
+ ).call(this, "decoded", packet);
+ }
+ }
+ } else {
+ throw new Error("Unknown type: " + obj);
+ }
+ },
+ /**
+ * Decode a packet String (JSON data)
+ *
+ * @param {String} str
+ * @return {Object} packet
+ */
+ },
+ {
+ key: "decodeString",
+ value: function decodeString(str) {
+ var i = 0;
+ // look up type
+ var p = {
+ type: Number(str.charAt(0)),
+ };
+ if (PacketType[p.type] === undefined) {
+ throw new Error("unknown packet type " + p.type);
+ }
+ // look up attachments if type binary
+ if (
+ p.type === PacketType.BINARY_EVENT ||
+ p.type === PacketType.BINARY_ACK
+ ) {
+ var start = i + 1;
+ while (str.charAt(++i) !== "-" && i != str.length) {}
+ var buf = str.substring(start, i);
+ if (buf != Number(buf) || str.charAt(i) !== "-") {
+ throw new Error("Illegal attachments");
+ }
+ p.attachments = Number(buf);
+ }
+ // look up namespace (if any)
+ if ("/" === str.charAt(i + 1)) {
+ var _start = i + 1;
+ while (++i) {
+ var c = str.charAt(i);
+ if ("," === c) break;
+ if (i === str.length) break;
+ }
+ p.nsp = str.substring(_start, i);
+ } else {
+ p.nsp = "/";
+ }
+ // look up id
+ var next = str.charAt(i + 1);
+ if ("" !== next && Number(next) == next) {
+ var _start2 = i + 1;
+ while (++i) {
+ var _c = str.charAt(i);
+ if (null == _c || Number(_c) != _c) {
+ --i;
+ break;
+ }
+ if (i === str.length) break;
+ }
+ p.id = Number(str.substring(_start2, i + 1));
+ }
+ // look up json data
+ if (str.charAt(++i)) {
+ var payload = this.tryParse(str.substr(i));
+ if (Decoder.isPayloadValid(p.type, payload)) {
+ p.data = payload;
+ } else {
+ throw new Error("invalid payload");
+ }
+ }
+ return p;
+ },
+ },
+ {
+ key: "tryParse",
+ value: function tryParse(str) {
+ try {
+ return JSON.parse(str, this.reviver);
+ } catch (e) {
+ return false;
+ }
+ },
+ },
+ {
+ key: "destroy",
+ value:
+ /**
+ * Deallocates a parser's resources
+ */
+ function destroy() {
+ if (this.reconstructor) {
+ this.reconstructor.finishedReconstruction();
+ this.reconstructor = null;
+ }
+ },
+ },
+ ],
+ [
+ {
+ key: "isPayloadValid",
+ value: function isPayloadValid(type, payload) {
+ switch (type) {
+ case PacketType.CONNECT:
+ return isObject(payload);
+ case PacketType.DISCONNECT:
+ return payload === undefined;
+ case PacketType.CONNECT_ERROR:
+ return typeof payload === "string" || isObject(payload);
+ case PacketType.EVENT:
+ case PacketType.BINARY_EVENT:
+ return (
+ Array.isArray(payload) &&
+ (typeof payload[0] === "number" ||
+ (typeof payload[0] === "string" &&
+ RESERVED_EVENTS$1.indexOf(payload[0]) === -1))
+ );
+ case PacketType.ACK:
+ case PacketType.BINARY_ACK:
+ return Array.isArray(payload);
+ }
+ },
+ },
+ ],
+ );
+ return Decoder;
+ })(Emitter);
+ /**
+ * A manager of a binary event's 'buffer sequence'. Should
+ * be constructed whenever a packet of type BINARY_EVENT is
+ * decoded.
+ *
+ * @param {Object} packet
+ * @return {BinaryReconstructor} initialized reconstructor
+ */
+ var BinaryReconstructor = /*#__PURE__*/ (function () {
+ function BinaryReconstructor(packet) {
+ _classCallCheck(this, BinaryReconstructor);
+ this.packet = packet;
+ this.buffers = [];
+ this.reconPack = packet;
+ }
+ /**
+ * Method to be called when binary data received from connection
+ * after a BINARY_EVENT packet.
+ *
+ * @param {Buffer | ArrayBuffer} binData - the raw binary data received
+ * @return {null | Object} returns null if more binary data is expected or
+ * a reconstructed packet object if all buffers have been received.
+ */
+ _createClass(BinaryReconstructor, [
+ {
+ key: "takeBinaryData",
+ value: function takeBinaryData(binData) {
+ this.buffers.push(binData);
+ if (this.buffers.length === this.reconPack.attachments) {
+ // done with buffer list
+ var packet = reconstructPacket(this.reconPack, this.buffers);
+ this.finishedReconstruction();
+ return packet;
+ }
+ return null;
+ },
+ /**
+ * Cleans up binary packet reconstruction variables.
+ */
+ },
+ {
+ key: "finishedReconstruction",
+ value: function finishedReconstruction() {
+ this.reconPack = null;
+ this.buffers = [];
+ },
+ },
+ ]);
+ return BinaryReconstructor;
+ })();
+
+ var parser = /*#__PURE__*/ Object.freeze({
+ __proto__: null,
+ protocol: protocol,
+ get PacketType() {
+ return PacketType;
+ },
+ Encoder: Encoder,
+ Decoder: Decoder,
+ });
+
+ function on(obj, ev, fn) {
+ obj.on(ev, fn);
+ return function subDestroy() {
+ obj.off(ev, fn);
+ };
+ }
+
+ /**
+ * Internal events.
+ * These events can't be emitted by the user.
+ */
+ var RESERVED_EVENTS = Object.freeze({
+ connect: 1,
+ connect_error: 1,
+ disconnect: 1,
+ disconnecting: 1,
+ // EventEmitter reserved events: https://nodejs.org/api/events.html#events_event_newlistener
+ newListener: 1,
+ removeListener: 1,
+ });
+ /**
+ * A Socket is the fundamental class for interacting with the server.
+ *
+ * A Socket belongs to a certain Namespace (by default /) and uses an underlying {@link Manager} to communicate.
+ *
+ * @example
+ * const socket = io();
+ *
+ * socket.on("connect", () => {
+ * console.log("connected");
+ * });
+ *
+ * // send an event to the server
+ * socket.emit("foo", "bar");
+ *
+ * socket.on("foobar", () => {
+ * // an event was received from the server
+ * });
+ *
+ * // upon disconnection
+ * socket.on("disconnect", (reason) => {
+ * console.log(`disconnected due to ${reason}`);
+ * });
+ */
+ var Socket = /*#__PURE__*/ (function (_Emitter) {
+ _inherits(Socket, _Emitter);
+ var _super = _createSuper(Socket);
+ /**
+ * `Socket` constructor.
+ */
+ function Socket(io, nsp, opts) {
+ var _this;
+ _classCallCheck(this, Socket);
+ _this = _super.call(this);
+ /**
+ * Whether the socket is currently connected to the server.
+ *
+ * @example
+ * const socket = io();
+ *
+ * socket.on("connect", () => {
+ * console.log(socket.connected); // true
+ * });
+ *
+ * socket.on("disconnect", () => {
+ * console.log(socket.connected); // false
+ * });
+ */
+ _this.connected = false;
+ /**
+ * Whether the connection state was recovered after a temporary disconnection. In that case, any missed packets will
+ * be transmitted by the server.
+ */
+ _this.recovered = false;
+ /**
+ * Buffer for packets received before the CONNECT packet
+ */
+ _this.receiveBuffer = [];
+ /**
+ * Buffer for packets that will be sent once the socket is connected
+ */
+ _this.sendBuffer = [];
+ /**
+ * The queue of packets to be sent with retry in case of failure.
+ *
+ * Packets are sent one by one, each waiting for the server acknowledgement, in order to guarantee the delivery order.
+ * @private
+ */
+ _this._queue = [];
+ /**
+ * A sequence to generate the ID of the {@link QueuedPacket}.
+ * @private
+ */
+ _this._queueSeq = 0;
+ _this.ids = 0;
+ /**
+ * A map containing acknowledgement handlers.
+ *
+ * The `withError` attribute is used to differentiate handlers that accept an error as first argument:
+ *
+ * - `socket.emit("test", (err, value) => { ... })` with `ackTimeout` option
+ * - `socket.timeout(5000).emit("test", (err, value) => { ... })`
+ * - `const value = await socket.emitWithAck("test")`
+ *
+ * From those that don't:
+ *
+ * - `socket.emit("test", (value) => { ... });`
+ *
+ * In the first case, the handlers will be called with an error when:
+ *
+ * - the timeout is reached
+ * - the socket gets disconnected
+ *
+ * In the second case, the handlers will be simply discarded upon disconnection, since the client will never receive
+ * an acknowledgement from the server.
+ *
+ * @private
+ */
+ _this.acks = {};
+ _this.flags = {};
+ _this.io = io;
+ _this.nsp = nsp;
+ if (opts && opts.auth) {
+ _this.auth = opts.auth;
+ }
+ _this._opts = _extends({}, opts);
+ if (_this.io._autoConnect) _this.open();
+ return _this;
+ }
+ /**
+ * Whether the socket is currently disconnected
+ *
+ * @example
+ * const socket = io();
+ *
+ * socket.on("connect", () => {
+ * console.log(socket.disconnected); // false
+ * });
+ *
+ * socket.on("disconnect", () => {
+ * console.log(socket.disconnected); // true
+ * });
+ */
+ _createClass(Socket, [
+ {
+ key: "disconnected",
+ get: function get() {
+ return !this.connected;
+ },
+ /**
+ * Subscribe to open, close and packet events
+ *
+ * @private
+ */
+ },
+ {
+ key: "subEvents",
+ value: function subEvents() {
+ if (this.subs) return;
+ var io = this.io;
+ this.subs = [
+ on(io, "open", this.onopen.bind(this)),
+ on(io, "packet", this.onpacket.bind(this)),
+ on(io, "error", this.onerror.bind(this)),
+ on(io, "close", this.onclose.bind(this)),
+ ];
+ },
+ /**
+ * Whether the Socket will try to reconnect when its Manager connects or reconnects.
+ *
+ * @example
+ * const socket = io();
+ *
+ * console.log(socket.active); // true
+ *
+ * socket.on("disconnect", (reason) => {
+ * if (reason === "io server disconnect") {
+ * // the disconnection was initiated by the server, you need to manually reconnect
+ * console.log(socket.active); // false
+ * }
+ * // else the socket will automatically try to reconnect
+ * console.log(socket.active); // true
+ * });
+ */
+ },
+ {
+ key: "active",
+ get: function get() {
+ return !!this.subs;
+ },
+ /**
+ * "Opens" the socket.
+ *
+ * @example
+ * const socket = io({
+ * autoConnect: false
+ * });
+ *
+ * socket.connect();
+ */
+ },
+ {
+ key: "connect",
+ value: function connect() {
+ if (this.connected) return this;
+ this.subEvents();
+ if (!this.io["_reconnecting"]) this.io.open(); // ensure open
+ if ("open" === this.io._readyState) this.onopen();
+ return this;
+ },
+ /**
+ * Alias for {@link connect()}.
+ */
+ },
+ {
+ key: "open",
+ value: function open() {
+ return this.connect();
+ },
+ /**
+ * Sends a `message` event.
+ *
+ * This method mimics the WebSocket.send() method.
+ *
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/WebSocket/send
+ *
+ * @example
+ * socket.send("hello");
+ *
+ * // this is equivalent to
+ * socket.emit("message", "hello");
+ *
+ * @return self
+ */
+ },
+ {
+ key: "send",
+ value: function send() {
+ for (
+ var _len = arguments.length, args = new Array(_len), _key = 0;
+ _key < _len;
+ _key++
+ ) {
+ args[_key] = arguments[_key];
+ }
+ args.unshift("message");
+ this.emit.apply(this, args);
+ return this;
+ },
+ /**
+ * Override `emit`.
+ * If the event is in `events`, it's emitted normally.
+ *
+ * @example
+ * socket.emit("hello", "world");
+ *
+ * // all serializable datastructures are supported (no need to call JSON.stringify)
+ * socket.emit("hello", 1, "2", { 3: ["4"], 5: Uint8Array.from([6]) });
+ *
+ * // with an acknowledgement from the server
+ * socket.emit("hello", "world", (val) => {
+ * // ...
+ * });
+ *
+ * @return self
+ */
+ },
+ {
+ key: "emit",
+ value: function emit(ev) {
+ if (RESERVED_EVENTS.hasOwnProperty(ev)) {
+ throw new Error('"' + ev.toString() + '" is a reserved event name');
+ }
+ for (
+ var _len2 = arguments.length,
+ args = new Array(_len2 > 1 ? _len2 - 1 : 0),
+ _key2 = 1;
+ _key2 < _len2;
+ _key2++
+ ) {
+ args[_key2 - 1] = arguments[_key2];
+ }
+ args.unshift(ev);
+ if (
+ this._opts.retries &&
+ !this.flags.fromQueue &&
+ !this.flags["volatile"]
+ ) {
+ this._addToQueue(args);
+ return this;
+ }
+ var packet = {
+ type: PacketType.EVENT,
+ data: args,
+ };
+ packet.options = {};
+ packet.options.compress = this.flags.compress !== false;
+ // event ack callback
+ if ("function" === typeof args[args.length - 1]) {
+ var id = this.ids++;
+ var ack = args.pop();
+ this._registerAckCallback(id, ack);
+ packet.id = id;
+ }
+ var isTransportWritable =
+ this.io.engine &&
+ this.io.engine.transport &&
+ this.io.engine.transport.writable;
+ var discardPacket =
+ this.flags["volatile"] && (!isTransportWritable || !this.connected);
+ if (discardPacket);
+ else if (this.connected) {
+ this.notifyOutgoingListeners(packet);
+ this.packet(packet);
+ } else {
+ this.sendBuffer.push(packet);
+ }
+ this.flags = {};
+ return this;
+ },
+ /**
+ * @private
+ */
+ },
+ {
+ key: "_registerAckCallback",
+ value: function _registerAckCallback(id, ack) {
+ var _this2 = this;
+ var _a;
+ var timeout =
+ (_a = this.flags.timeout) !== null && _a !== void 0
+ ? _a
+ : this._opts.ackTimeout;
+ if (timeout === undefined) {
+ this.acks[id] = ack;
+ return;
+ }
+ // @ts-ignore
+ var timer = this.io.setTimeoutFn(function () {
+ delete _this2.acks[id];
+ for (var i = 0; i < _this2.sendBuffer.length; i++) {
+ if (_this2.sendBuffer[i].id === id) {
+ _this2.sendBuffer.splice(i, 1);
+ }
+ }
+ ack.call(_this2, new Error("operation has timed out"));
+ }, timeout);
+ var fn = function fn() {
+ // @ts-ignore
+ _this2.io.clearTimeoutFn(timer);
+ for (
+ var _len3 = arguments.length, args = new Array(_len3), _key3 = 0;
+ _key3 < _len3;
+ _key3++
+ ) {
+ args[_key3] = arguments[_key3];
+ }
+ ack.apply(_this2, args);
+ };
+ fn.withError = true;
+ this.acks[id] = fn;
+ },
+ /**
+ * Emits an event and waits for an acknowledgement
+ *
+ * @example
+ * // without timeout
+ * const response = await socket.emitWithAck("hello", "world");
+ *
+ * // with a specific timeout
+ * try {
+ * const response = await socket.timeout(1000).emitWithAck("hello", "world");
+ * } catch (err) {
+ * // the server did not acknowledge the event in the given delay
+ * }
+ *
+ * @return a Promise that will be fulfilled when the server acknowledges the event
+ */
+ },
+ {
+ key: "emitWithAck",
+ value: function emitWithAck(ev) {
+ var _this3 = this;
+ for (
+ var _len4 = arguments.length,
+ args = new Array(_len4 > 1 ? _len4 - 1 : 0),
+ _key4 = 1;
+ _key4 < _len4;
+ _key4++
+ ) {
+ args[_key4 - 1] = arguments[_key4];
+ }
+ return new Promise(function (resolve, reject) {
+ var fn = function fn(arg1, arg2) {
+ return arg1 ? reject(arg1) : resolve(arg2);
+ };
+ fn.withError = true;
+ args.push(fn);
+ _this3.emit.apply(_this3, [ev].concat(args));
+ });
+ },
+ /**
+ * Add the packet to the queue.
+ * @param args
+ * @private
+ */
+ },
+ {
+ key: "_addToQueue",
+ value: function _addToQueue(args) {
+ var _this4 = this;
+ var ack;
+ if (typeof args[args.length - 1] === "function") {
+ ack = args.pop();
+ }
+ var packet = {
+ id: this._queueSeq++,
+ tryCount: 0,
+ pending: false,
+ args: args,
+ flags: _extends(
+ {
+ fromQueue: true,
+ },
+ this.flags,
+ ),
+ };
+ args.push(function (err) {
+ if (packet !== _this4._queue[0]) {
+ // the packet has already been acknowledged
+ return;
+ }
+ var hasError = err !== null;
+ if (hasError) {
+ if (packet.tryCount > _this4._opts.retries) {
+ _this4._queue.shift();
+ if (ack) {
+ ack(err);
+ }
+ }
+ } else {
+ _this4._queue.shift();
+ if (ack) {
+ for (
+ var _len5 = arguments.length,
+ responseArgs = new Array(_len5 > 1 ? _len5 - 1 : 0),
+ _key5 = 1;
+ _key5 < _len5;
+ _key5++
+ ) {
+ responseArgs[_key5 - 1] = arguments[_key5];
+ }
+ ack.apply(void 0, [null].concat(responseArgs));
+ }
+ }
+ packet.pending = false;
+ return _this4._drainQueue();
+ });
+ this._queue.push(packet);
+ this._drainQueue();
+ },
+ /**
+ * Send the first packet of the queue, and wait for an acknowledgement from the server.
+ * @param force - whether to resend a packet that has not been acknowledged yet
+ *
+ * @private
+ */
+ },
+ {
+ key: "_drainQueue",
+ value: function _drainQueue() {
+ var force =
+ arguments.length > 0 && arguments[0] !== undefined
+ ? arguments[0]
+ : false;
+ if (!this.connected || this._queue.length === 0) {
+ return;
+ }
+ var packet = this._queue[0];
+ if (packet.pending && !force) {
+ return;
+ }
+ packet.pending = true;
+ packet.tryCount++;
+ this.flags = packet.flags;
+ this.emit.apply(this, packet.args);
+ },
+ /**
+ * Sends a packet.
+ *
+ * @param packet
+ * @private
+ */
+ },
+ {
+ key: "packet",
+ value: function packet(_packet) {
+ _packet.nsp = this.nsp;
+ this.io._packet(_packet);
+ },
+ /**
+ * Called upon engine `open`.
+ *
+ * @private
+ */
+ },
+ {
+ key: "onopen",
+ value: function onopen() {
+ var _this5 = this;
+ if (typeof this.auth == "function") {
+ this.auth(function (data) {
+ _this5._sendConnectPacket(data);
+ });
+ } else {
+ this._sendConnectPacket(this.auth);
+ }
+ },
+ /**
+ * Sends a CONNECT packet to initiate the Socket.IO session.
+ *
+ * @param data
+ * @private
+ */
+ },
+ {
+ key: "_sendConnectPacket",
+ value: function _sendConnectPacket(data) {
+ this.packet({
+ type: PacketType.CONNECT,
+ data: this._pid
+ ? _extends(
+ {
+ pid: this._pid,
+ offset: this._lastOffset,
+ },
+ data,
+ )
+ : data,
+ });
+ },
+ /**
+ * Called upon engine or manager `error`.
+ *
+ * @param err
+ * @private
+ */
+ },
+ {
+ key: "onerror",
+ value: function onerror(err) {
+ if (!this.connected) {
+ this.emitReserved("connect_error", err);
+ }
+ },
+ /**
+ * Called upon engine `close`.
+ *
+ * @param reason
+ * @param description
+ * @private
+ */
+ },
+ {
+ key: "onclose",
+ value: function onclose(reason, description) {
+ this.connected = false;
+ delete this.id;
+ this.emitReserved("disconnect", reason, description);
+ this._clearAcks();
+ },
+ /**
+ * Clears the acknowledgement handlers upon disconnection, since the client will never receive an acknowledgement from
+ * the server.
+ *
+ * @private
+ */
+ },
+ {
+ key: "_clearAcks",
+ value: function _clearAcks() {
+ var _this6 = this;
+ Object.keys(this.acks).forEach(function (id) {
+ var isBuffered = _this6.sendBuffer.some(function (packet) {
+ return String(packet.id) === id;
+ });
+ if (!isBuffered) {
+ // note: handlers that do not accept an error as first argument are ignored here
+ var ack = _this6.acks[id];
+ delete _this6.acks[id];
+ if (ack.withError) {
+ ack.call(_this6, new Error("socket has been disconnected"));
+ }
+ }
+ });
+ },
+ /**
+ * Called with socket packet.
+ *
+ * @param packet
+ * @private
+ */
+ },
+ {
+ key: "onpacket",
+ value: function onpacket(packet) {
+ var sameNamespace = packet.nsp === this.nsp;
+ if (!sameNamespace) return;
+ switch (packet.type) {
+ case PacketType.CONNECT:
+ if (packet.data && packet.data.sid) {
+ this.onconnect(packet.data.sid, packet.data.pid);
+ } else {
+ this.emitReserved(
+ "connect_error",
+ new Error(
+ "It seems you are trying to reach a Socket.IO server in v2.x with a v3.x client, but they are not compatible (more information here: https://socket.io/docs/v3/migrating-from-2-x-to-3-0/)",
+ ),
+ );
+ }
+ break;
+ case PacketType.EVENT:
+ case PacketType.BINARY_EVENT:
+ this.onevent(packet);
+ break;
+ case PacketType.ACK:
+ case PacketType.BINARY_ACK:
+ this.onack(packet);
+ break;
+ case PacketType.DISCONNECT:
+ this.ondisconnect();
+ break;
+ case PacketType.CONNECT_ERROR:
+ this.destroy();
+ var err = new Error(packet.data.message);
+ // @ts-ignore
+ err.data = packet.data.data;
+ this.emitReserved("connect_error", err);
+ break;
+ }
+ },
+ /**
+ * Called upon a server event.
+ *
+ * @param packet
+ * @private
+ */
+ },
+ {
+ key: "onevent",
+ value: function onevent(packet) {
+ var args = packet.data || [];
+ if (null != packet.id) {
+ args.push(this.ack(packet.id));
+ }
+ if (this.connected) {
+ this.emitEvent(args);
+ } else {
+ this.receiveBuffer.push(Object.freeze(args));
+ }
+ },
+ },
+ {
+ key: "emitEvent",
+ value: function emitEvent(args) {
+ if (this._anyListeners && this._anyListeners.length) {
+ var listeners = this._anyListeners.slice();
+ var _iterator = _createForOfIteratorHelper(listeners),
+ _step;
+ try {
+ for (_iterator.s(); !(_step = _iterator.n()).done; ) {
+ var listener = _step.value;
+ listener.apply(this, args);
+ }
+ } catch (err) {
+ _iterator.e(err);
+ } finally {
+ _iterator.f();
+ }
+ }
+ _get(_getPrototypeOf(Socket.prototype), "emit", this).apply(
+ this,
+ args,
+ );
+ if (
+ this._pid &&
+ args.length &&
+ typeof args[args.length - 1] === "string"
+ ) {
+ this._lastOffset = args[args.length - 1];
+ }
+ },
+ /**
+ * Produces an ack callback to emit with an event.
+ *
+ * @private
+ */
+ },
+ {
+ key: "ack",
+ value: function ack(id) {
+ var self = this;
+ var sent = false;
+ return function () {
+ // prevent double callbacks
+ if (sent) return;
+ sent = true;
+ for (
+ var _len6 = arguments.length, args = new Array(_len6), _key6 = 0;
+ _key6 < _len6;
+ _key6++
+ ) {
+ args[_key6] = arguments[_key6];
+ }
+ self.packet({
+ type: PacketType.ACK,
+ id: id,
+ data: args,
+ });
+ };
+ },
+ /**
+ * Called upon a server acknowledgement.
+ *
+ * @param packet
+ * @private
+ */
+ },
+ {
+ key: "onack",
+ value: function onack(packet) {
+ var ack = this.acks[packet.id];
+ if (typeof ack !== "function") {
+ return;
+ }
+ delete this.acks[packet.id];
+ // @ts-ignore FIXME ack is incorrectly inferred as 'never'
+ if (ack.withError) {
+ packet.data.unshift(null);
+ }
+ // @ts-ignore
+ ack.apply(this, packet.data);
+ },
+ /**
+ * Called upon server connect.
+ *
+ * @private
+ */
+ },
+ {
+ key: "onconnect",
+ value: function onconnect(id, pid) {
+ this.id = id;
+ this.recovered = pid && this._pid === pid;
+ this._pid = pid; // defined only if connection state recovery is enabled
+ this.connected = true;
+ this.emitBuffered();
+ this.emitReserved("connect");
+ this._drainQueue(true);
+ },
+ /**
+ * Emit buffered events (received and emitted).
+ *
+ * @private
+ */
+ },
+ {
+ key: "emitBuffered",
+ value: function emitBuffered() {
+ var _this7 = this;
+ this.receiveBuffer.forEach(function (args) {
+ return _this7.emitEvent(args);
+ });
+ this.receiveBuffer = [];
+ this.sendBuffer.forEach(function (packet) {
+ _this7.notifyOutgoingListeners(packet);
+ _this7.packet(packet);
+ });
+ this.sendBuffer = [];
+ },
+ /**
+ * Called upon server disconnect.
+ *
+ * @private
+ */
+ },
+ {
+ key: "ondisconnect",
+ value: function ondisconnect() {
+ this.destroy();
+ this.onclose("io server disconnect");
+ },
+ /**
+ * Called upon forced client/server side disconnections,
+ * this method ensures the manager stops tracking us and
+ * that reconnections don't get triggered for this.
+ *
+ * @private
+ */
+ },
+ {
+ key: "destroy",
+ value: function destroy() {
+ if (this.subs) {
+ // clean subscriptions to avoid reconnections
+ this.subs.forEach(function (subDestroy) {
+ return subDestroy();
+ });
+ this.subs = undefined;
+ }
+ this.io["_destroy"](this);
+ },
+ /**
+ * Disconnects the socket manually. In that case, the socket will not try to reconnect.
+ *
+ * If this is the last active Socket instance of the {@link Manager}, the low-level connection will be closed.
+ *
+ * @example
+ * const socket = io();
+ *
+ * socket.on("disconnect", (reason) => {
+ * // console.log(reason); prints "io client disconnect"
+ * });
+ *
+ * socket.disconnect();
+ *
+ * @return self
+ */
+ },
+ {
+ key: "disconnect",
+ value: function disconnect() {
+ if (this.connected) {
+ this.packet({
+ type: PacketType.DISCONNECT,
+ });
+ }
+ // remove socket from pool
+ this.destroy();
+ if (this.connected) {
+ // fire events
+ this.onclose("io client disconnect");
+ }
+ return this;
+ },
+ /**
+ * Alias for {@link disconnect()}.
+ *
+ * @return self
+ */
+ },
+ {
+ key: "close",
+ value: function close() {
+ return this.disconnect();
+ },
+ /**
+ * Sets the compress flag.
+ *
+ * @example
+ * socket.compress(false).emit("hello");
+ *
+ * @param compress - if `true`, compresses the sending data
+ * @return self
+ */
+ },
+ {
+ key: "compress",
+ value: function compress(_compress) {
+ this.flags.compress = _compress;
+ return this;
+ },
+ /**
+ * Sets a modifier for a subsequent event emission that the event message will be dropped when this socket is not
+ * ready to send messages.
+ *
+ * @example
+ * socket.volatile.emit("hello"); // the server may or may not receive it
+ *
+ * @returns self
+ */
+ },
+ {
+ key: "volatile",
+ get: function get() {
+ this.flags["volatile"] = true;
+ return this;
+ },
+ /**
+ * Sets a modifier for a subsequent event emission that the callback will be called with an error when the
+ * given number of milliseconds have elapsed without an acknowledgement from the server:
+ *
+ * @example
+ * socket.timeout(5000).emit("my-event", (err) => {
+ * if (err) {
+ * // the server did not acknowledge the event in the given delay
+ * }
+ * });
+ *
+ * @returns self
+ */
+ },
+ {
+ key: "timeout",
+ value: function timeout(_timeout) {
+ this.flags.timeout = _timeout;
+ return this;
+ },
+ /**
+ * Adds a listener that will be fired when any event is emitted. The event name is passed as the first argument to the
+ * callback.
+ *
+ * @example
+ * socket.onAny((event, ...args) => {
+ * console.log(`got ${event}`);
+ * });
+ *
+ * @param listener
+ */
+ },
+ {
+ key: "onAny",
+ value: function onAny(listener) {
+ this._anyListeners = this._anyListeners || [];
+ this._anyListeners.push(listener);
+ return this;
+ },
+ /**
+ * Adds a listener that will be fired when any event is emitted. The event name is passed as the first argument to the
+ * callback. The listener is added to the beginning of the listeners array.
+ *
+ * @example
+ * socket.prependAny((event, ...args) => {
+ * console.log(`got event ${event}`);
+ * });
+ *
+ * @param listener
+ */
+ },
+ {
+ key: "prependAny",
+ value: function prependAny(listener) {
+ this._anyListeners = this._anyListeners || [];
+ this._anyListeners.unshift(listener);
+ return this;
+ },
+ /**
+ * Removes the listener that will be fired when any event is emitted.
+ *
+ * @example
+ * const catchAllListener = (event, ...args) => {
+ * console.log(`got event ${event}`);
+ * }
+ *
+ * socket.onAny(catchAllListener);
+ *
+ * // remove a specific listener
+ * socket.offAny(catchAllListener);
+ *
+ * // or remove all listeners
+ * socket.offAny();
+ *
+ * @param listener
+ */
+ },
+ {
+ key: "offAny",
+ value: function offAny(listener) {
+ if (!this._anyListeners) {
+ return this;
+ }
+ if (listener) {
+ var listeners = this._anyListeners;
+ for (var i = 0; i < listeners.length; i++) {
+ if (listener === listeners[i]) {
+ listeners.splice(i, 1);
+ return this;
+ }
+ }
+ } else {
+ this._anyListeners = [];
+ }
+ return this;
+ },
+ /**
+ * Returns an array of listeners that are listening for any event that is specified. This array can be manipulated,
+ * e.g. to remove listeners.
+ */
+ },
+ {
+ key: "listenersAny",
+ value: function listenersAny() {
+ return this._anyListeners || [];
+ },
+ /**
+ * Adds a listener that will be fired when any event is emitted. The event name is passed as the first argument to the
+ * callback.
+ *
+ * Note: acknowledgements sent to the server are not included.
+ *
+ * @example
+ * socket.onAnyOutgoing((event, ...args) => {
+ * console.log(`sent event ${event}`);
+ * });
+ *
+ * @param listener
+ */
+ },
+ {
+ key: "onAnyOutgoing",
+ value: function onAnyOutgoing(listener) {
+ this._anyOutgoingListeners = this._anyOutgoingListeners || [];
+ this._anyOutgoingListeners.push(listener);
+ return this;
+ },
+ /**
+ * Adds a listener that will be fired when any event is emitted. The event name is passed as the first argument to the
+ * callback. The listener is added to the beginning of the listeners array.
+ *
+ * Note: acknowledgements sent to the server are not included.
+ *
+ * @example
+ * socket.prependAnyOutgoing((event, ...args) => {
+ * console.log(`sent event ${event}`);
+ * });
+ *
+ * @param listener
+ */
+ },
+ {
+ key: "prependAnyOutgoing",
+ value: function prependAnyOutgoing(listener) {
+ this._anyOutgoingListeners = this._anyOutgoingListeners || [];
+ this._anyOutgoingListeners.unshift(listener);
+ return this;
+ },
+ /**
+ * Removes the listener that will be fired when any event is emitted.
+ *
+ * @example
+ * const catchAllListener = (event, ...args) => {
+ * console.log(`sent event ${event}`);
+ * }
+ *
+ * socket.onAnyOutgoing(catchAllListener);
+ *
+ * // remove a specific listener
+ * socket.offAnyOutgoing(catchAllListener);
+ *
+ * // or remove all listeners
+ * socket.offAnyOutgoing();
+ *
+ * @param [listener] - the catch-all listener (optional)
+ */
+ },
+ {
+ key: "offAnyOutgoing",
+ value: function offAnyOutgoing(listener) {
+ if (!this._anyOutgoingListeners) {
+ return this;
+ }
+ if (listener) {
+ var listeners = this._anyOutgoingListeners;
+ for (var i = 0; i < listeners.length; i++) {
+ if (listener === listeners[i]) {
+ listeners.splice(i, 1);
+ return this;
+ }
+ }
+ } else {
+ this._anyOutgoingListeners = [];
+ }
+ return this;
+ },
+ /**
+ * Returns an array of listeners that are listening for any event that is specified. This array can be manipulated,
+ * e.g. to remove listeners.
+ */
+ },
+ {
+ key: "listenersAnyOutgoing",
+ value: function listenersAnyOutgoing() {
+ return this._anyOutgoingListeners || [];
+ },
+ /**
+ * Notify the listeners for each packet sent
+ *
+ * @param packet
+ *
+ * @private
+ */
+ },
+ {
+ key: "notifyOutgoingListeners",
+ value: function notifyOutgoingListeners(packet) {
+ if (this._anyOutgoingListeners && this._anyOutgoingListeners.length) {
+ var listeners = this._anyOutgoingListeners.slice();
+ var _iterator2 = _createForOfIteratorHelper(listeners),
+ _step2;
+ try {
+ for (_iterator2.s(); !(_step2 = _iterator2.n()).done; ) {
+ var listener = _step2.value;
+ listener.apply(this, packet.data);
+ }
+ } catch (err) {
+ _iterator2.e(err);
+ } finally {
+ _iterator2.f();
+ }
+ }
+ },
+ },
+ ]);
+ return Socket;
+ })(Emitter);
+
+ /**
+ * Initialize backoff timer with `opts`.
+ *
+ * - `min` initial timeout in milliseconds [100]
+ * - `max` max timeout [10000]
+ * - `jitter` [0]
+ * - `factor` [2]
+ *
+ * @param {Object} opts
+ * @api public
+ */
+ function Backoff(opts) {
+ opts = opts || {};
+ this.ms = opts.min || 100;
+ this.max = opts.max || 10000;
+ this.factor = opts.factor || 2;
+ this.jitter = opts.jitter > 0 && opts.jitter <= 1 ? opts.jitter : 0;
+ this.attempts = 0;
+ }
+ /**
+ * Return the backoff duration.
+ *
+ * @return {Number}
+ * @api public
+ */
+ Backoff.prototype.duration = function () {
+ var ms = this.ms * Math.pow(this.factor, this.attempts++);
+ if (this.jitter) {
+ var rand = Math.random();
+ var deviation = Math.floor(rand * this.jitter * ms);
+ ms = (Math.floor(rand * 10) & 1) == 0 ? ms - deviation : ms + deviation;
+ }
+ return Math.min(ms, this.max) | 0;
+ };
+ /**
+ * Reset the number of attempts.
+ *
+ * @api public
+ */
+ Backoff.prototype.reset = function () {
+ this.attempts = 0;
+ };
+ /**
+ * Set the minimum duration
+ *
+ * @api public
+ */
+ Backoff.prototype.setMin = function (min) {
+ this.ms = min;
+ };
+ /**
+ * Set the maximum duration
+ *
+ * @api public
+ */
+ Backoff.prototype.setMax = function (max) {
+ this.max = max;
+ };
+ /**
+ * Set the jitter
+ *
+ * @api public
+ */
+ Backoff.prototype.setJitter = function (jitter) {
+ this.jitter = jitter;
+ };
+
+ var Manager = /*#__PURE__*/ (function (_Emitter) {
+ _inherits(Manager, _Emitter);
+ var _super = _createSuper(Manager);
+ function Manager(uri, opts) {
+ var _this;
+ _classCallCheck(this, Manager);
+ var _a;
+ _this = _super.call(this);
+ _this.nsps = {};
+ _this.subs = [];
+ if (uri && "object" === _typeof(uri)) {
+ opts = uri;
+ uri = undefined;
+ }
+ opts = opts || {};
+ opts.path = opts.path || "/socket.io";
+ _this.opts = opts;
+ installTimerFunctions(_assertThisInitialized(_this), opts);
+ _this.reconnection(opts.reconnection !== false);
+ _this.reconnectionAttempts(opts.reconnectionAttempts || Infinity);
+ _this.reconnectionDelay(opts.reconnectionDelay || 1000);
+ _this.reconnectionDelayMax(opts.reconnectionDelayMax || 5000);
+ _this.randomizationFactor(
+ (_a = opts.randomizationFactor) !== null && _a !== void 0 ? _a : 0.5,
+ );
+ _this.backoff = new Backoff({
+ min: _this.reconnectionDelay(),
+ max: _this.reconnectionDelayMax(),
+ jitter: _this.randomizationFactor(),
+ });
+ _this.timeout(null == opts.timeout ? 20000 : opts.timeout);
+ _this._readyState = "closed";
+ _this.uri = uri;
+ var _parser = opts.parser || parser;
+ _this.encoder = new _parser.Encoder();
+ _this.decoder = new _parser.Decoder();
+ _this._autoConnect = opts.autoConnect !== false;
+ if (_this._autoConnect) _this.open();
+ return _this;
+ }
+ _createClass(Manager, [
+ {
+ key: "reconnection",
+ value: function reconnection(v) {
+ if (!arguments.length) return this._reconnection;
+ this._reconnection = !!v;
+ return this;
+ },
+ },
+ {
+ key: "reconnectionAttempts",
+ value: function reconnectionAttempts(v) {
+ if (v === undefined) return this._reconnectionAttempts;
+ this._reconnectionAttempts = v;
+ return this;
+ },
+ },
+ {
+ key: "reconnectionDelay",
+ value: function reconnectionDelay(v) {
+ var _a;
+ if (v === undefined) return this._reconnectionDelay;
+ this._reconnectionDelay = v;
+ (_a = this.backoff) === null || _a === void 0 ? void 0 : _a.setMin(v);
+ return this;
+ },
+ },
+ {
+ key: "randomizationFactor",
+ value: function randomizationFactor(v) {
+ var _a;
+ if (v === undefined) return this._randomizationFactor;
+ this._randomizationFactor = v;
+ (_a = this.backoff) === null || _a === void 0
+ ? void 0
+ : _a.setJitter(v);
+ return this;
+ },
+ },
+ {
+ key: "reconnectionDelayMax",
+ value: function reconnectionDelayMax(v) {
+ var _a;
+ if (v === undefined) return this._reconnectionDelayMax;
+ this._reconnectionDelayMax = v;
+ (_a = this.backoff) === null || _a === void 0 ? void 0 : _a.setMax(v);
+ return this;
+ },
+ },
+ {
+ key: "timeout",
+ value: function timeout(v) {
+ if (!arguments.length) return this._timeout;
+ this._timeout = v;
+ return this;
+ },
+ /**
+ * Starts trying to reconnect if reconnection is enabled and we have not
+ * started reconnecting yet
+ *
+ * @private
+ */
+ },
+ {
+ key: "maybeReconnectOnOpen",
+ value: function maybeReconnectOnOpen() {
+ // Only try to reconnect if it's the first time we're connecting
+ if (
+ !this._reconnecting &&
+ this._reconnection &&
+ this.backoff.attempts === 0
+ ) {
+ // keeps reconnection from firing twice for the same reconnection loop
+ this.reconnect();
+ }
+ },
+ /**
+ * Sets the current transport `socket`.
+ *
+ * @param {Function} fn - optional, callback
+ * @return self
+ * @public
+ */
+ },
+ {
+ key: "open",
+ value: function open(fn) {
+ var _this2 = this;
+ if (~this._readyState.indexOf("open")) return this;
+ this.engine = new Socket$1(this.uri, this.opts);
+ var socket = this.engine;
+ var self = this;
+ this._readyState = "opening";
+ this.skipReconnect = false;
+ // emit `open`
+ var openSubDestroy = on(socket, "open", function () {
+ self.onopen();
+ fn && fn();
+ });
+ var onError = function onError(err) {
+ _this2.cleanup();
+ _this2._readyState = "closed";
+ _this2.emitReserved("error", err);
+ if (fn) {
+ fn(err);
+ } else {
+ // Only do this if there is no fn to handle the error
+ _this2.maybeReconnectOnOpen();
+ }
+ };
+ // emit `error`
+ var errorSub = on(socket, "error", onError);
+ if (false !== this._timeout) {
+ var timeout = this._timeout;
+ // set timer
+ var timer = this.setTimeoutFn(function () {
+ openSubDestroy();
+ onError(new Error("timeout"));
+ socket.close();
+ }, timeout);
+ if (this.opts.autoUnref) {
+ timer.unref();
+ }
+ this.subs.push(function () {
+ _this2.clearTimeoutFn(timer);
+ });
+ }
+ this.subs.push(openSubDestroy);
+ this.subs.push(errorSub);
+ return this;
+ },
+ /**
+ * Alias for open()
+ *
+ * @return self
+ * @public
+ */
+ },
+ {
+ key: "connect",
+ value: function connect(fn) {
+ return this.open(fn);
+ },
+ /**
+ * Called upon transport open.
+ *
+ * @private
+ */
+ },
+ {
+ key: "onopen",
+ value: function onopen() {
+ // clear old subs
+ this.cleanup();
+ // mark as open
+ this._readyState = "open";
+ this.emitReserved("open");
+ // add new subs
+ var socket = this.engine;
+ this.subs.push(
+ on(socket, "ping", this.onping.bind(this)),
+ on(socket, "data", this.ondata.bind(this)),
+ on(socket, "error", this.onerror.bind(this)),
+ on(socket, "close", this.onclose.bind(this)),
+ on(this.decoder, "decoded", this.ondecoded.bind(this)),
+ );
+ },
+ /**
+ * Called upon a ping.
+ *
+ * @private
+ */
+ },
+ {
+ key: "onping",
+ value: function onping() {
+ this.emitReserved("ping");
+ },
+ /**
+ * Called with data.
+ *
+ * @private
+ */
+ },
+ {
+ key: "ondata",
+ value: function ondata(data) {
+ try {
+ this.decoder.add(data);
+ } catch (e) {
+ this.onclose("parse error", e);
+ }
+ },
+ /**
+ * Called when parser fully decodes a packet.
+ *
+ * @private
+ */
+ },
+ {
+ key: "ondecoded",
+ value: function ondecoded(packet) {
+ var _this3 = this;
+ // the nextTick call prevents an exception in a user-provided event listener from triggering a disconnection due to a "parse error"
+ nextTick(function () {
+ _this3.emitReserved("packet", packet);
+ }, this.setTimeoutFn);
+ },
+ /**
+ * Called upon socket error.
+ *
+ * @private
+ */
+ },
+ {
+ key: "onerror",
+ value: function onerror(err) {
+ this.emitReserved("error", err);
+ },
+ /**
+ * Creates a new socket for the given `nsp`.
+ *
+ * @return {Socket}
+ * @public
+ */
+ },
+ {
+ key: "socket",
+ value: function socket(nsp, opts) {
+ var socket = this.nsps[nsp];
+ if (!socket) {
+ socket = new Socket(this, nsp, opts);
+ this.nsps[nsp] = socket;
+ } else if (this._autoConnect && !socket.active) {
+ socket.connect();
+ }
+ return socket;
+ },
+ /**
+ * Called upon a socket close.
+ *
+ * @param socket
+ * @private
+ */
+ },
+ {
+ key: "_destroy",
+ value: function _destroy(socket) {
+ var nsps = Object.keys(this.nsps);
+ for (var _i = 0, _nsps = nsps; _i < _nsps.length; _i++) {
+ var nsp = _nsps[_i];
+ var _socket = this.nsps[nsp];
+ if (_socket.active) {
+ return;
+ }
+ }
+ this._close();
+ },
+ /**
+ * Writes a packet.
+ *
+ * @param packet
+ * @private
+ */
+ },
+ {
+ key: "_packet",
+ value: function _packet(packet) {
+ var encodedPackets = this.encoder.encode(packet);
+ for (var i = 0; i < encodedPackets.length; i++) {
+ this.engine.write(encodedPackets[i], packet.options);
+ }
+ },
+ /**
+ * Clean up transport subscriptions and packet buffer.
+ *
+ * @private
+ */
+ },
+ {
+ key: "cleanup",
+ value: function cleanup() {
+ this.subs.forEach(function (subDestroy) {
+ return subDestroy();
+ });
+ this.subs.length = 0;
+ this.decoder.destroy();
+ },
+ /**
+ * Close the current socket.
+ *
+ * @private
+ */
+ },
+ {
+ key: "_close",
+ value: function _close() {
+ this.skipReconnect = true;
+ this._reconnecting = false;
+ this.onclose("forced close");
+ if (this.engine) this.engine.close();
+ },
+ /**
+ * Alias for close()
+ *
+ * @private
+ */
+ },
+ {
+ key: "disconnect",
+ value: function disconnect() {
+ return this._close();
+ },
+ /**
+ * Called upon engine close.
+ *
+ * @private
+ */
+ },
+ {
+ key: "onclose",
+ value: function onclose(reason, description) {
+ this.cleanup();
+ this.backoff.reset();
+ this._readyState = "closed";
+ this.emitReserved("close", reason, description);
+ if (this._reconnection && !this.skipReconnect) {
+ this.reconnect();
+ }
+ },
+ /**
+ * Attempt a reconnection.
+ *
+ * @private
+ */
+ },
+ {
+ key: "reconnect",
+ value: function reconnect() {
+ var _this4 = this;
+ if (this._reconnecting || this.skipReconnect) return this;
+ var self = this;
+ if (this.backoff.attempts >= this._reconnectionAttempts) {
+ this.backoff.reset();
+ this.emitReserved("reconnect_failed");
+ this._reconnecting = false;
+ } else {
+ var delay = this.backoff.duration();
+ this._reconnecting = true;
+ var timer = this.setTimeoutFn(function () {
+ if (self.skipReconnect) return;
+ _this4.emitReserved("reconnect_attempt", self.backoff.attempts);
+ // check again for the case socket closed in above events
+ if (self.skipReconnect) return;
+ self.open(function (err) {
+ if (err) {
+ self._reconnecting = false;
+ self.reconnect();
+ _this4.emitReserved("reconnect_error", err);
+ } else {
+ self.onreconnect();
+ }
+ });
+ }, delay);
+ if (this.opts.autoUnref) {
+ timer.unref();
+ }
+ this.subs.push(function () {
+ _this4.clearTimeoutFn(timer);
+ });
+ }
+ },
+ /**
+ * Called upon successful reconnect.
+ *
+ * @private
+ */
+ },
+ {
+ key: "onreconnect",
+ value: function onreconnect() {
+ var attempt = this.backoff.attempts;
+ this._reconnecting = false;
+ this.backoff.reset();
+ this.emitReserved("reconnect", attempt);
+ },
+ },
+ ]);
+ return Manager;
+ })(Emitter);
+
+ /**
+ * Managers cache.
+ */
+ var cache = {};
+ function lookup(uri, opts) {
+ if (_typeof(uri) === "object") {
+ opts = uri;
+ uri = undefined;
+ }
+ opts = opts || {};
+ var parsed = url(uri, opts.path || "/socket.io");
+ var source = parsed.source;
+ var id = parsed.id;
+ var path = parsed.path;
+ var sameNamespace = cache[id] && path in cache[id]["nsps"];
+ var newConnection =
+ opts.forceNew ||
+ opts["force new connection"] ||
+ false === opts.multiplex ||
+ sameNamespace;
+ var io;
+ if (newConnection) {
+ io = new Manager(source, opts);
+ } else {
+ if (!cache[id]) {
+ cache[id] = new Manager(source, opts);
+ }
+ io = cache[id];
+ }
+ if (parsed.query && !opts.query) {
+ opts.query = parsed.queryKey;
+ }
+ return io.socket(parsed.path, opts);
+ }
+ // so that "lookup" can be used both as a function (e.g. `io(...)`) and as a
+ // namespace (e.g. `io.connect(...)`), for backward compatibility
+ _extends(lookup, {
+ Manager: Manager,
+ Socket: Socket,
+ io: lookup,
+ connect: lookup,
+ });
+
+ return lookup;
+});
+//# sourceMappingURL=socket.io.js.map
diff --git a/demo_websockets/server.js b/demo_websockets/server.js
new file mode 100644
index 0000000000000000000000000000000000000000..b85aba493540602dbd9e6a2cfc8306f3cdac86b3
--- /dev/null
+++ b/demo_websockets/server.js
@@ -0,0 +1,129 @@
+let express = require("express");
+let http = require("http");
+let { Server } = require("socket.io");
+
+// after running
+// npm i socket.io
+// client library is at
+// node_modules/socket.io/client-dist/socket.io.js
+// copy that file into public/ so it can be "imported" client-side, too
+
+let app = express();
+let server = http.createServer(app);
+let io = new Server(server);
+
+app.use(express.static("public"));
+
+// global object to hold socket objects; structure is:
+// {[roomId]: {[socketId]: [...socket objects...]}}
+let rooms = {};
+// can also use socket.io's rooms functionality
+// instead of manually maintaining an object of rooms
+// https://socket.io/docs/v3/rooms/
+
+function generateRoomCode() {
+ let characters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
+ let result = "";
+ for (let i = 0; i < 4; i++) {
+ result += characters.charAt(Math.floor(Math.random() * characters.length));
+ }
+ return result;
+}
+
+// for debugging
+function printRooms() {
+ for (let [roomId, sockets] of Object.entries(rooms)) {
+ console.log(roomId);
+ for (let [socketId, socket] of Object.entries(sockets)) {
+ console.log(`\t${socketId}`);
+ }
+ }
+}
+
+app.post("/create", (req, res) => {
+ let roomId = generateRoomCode();
+ rooms[roomId] = {};
+ return res.json({ roomId });
+});
+
+app.get("/room/:roomId", (req, res) => {
+ let { roomId } = req.params;
+ if (!rooms.hasOwnProperty(roomId)) {
+ return res.status(404).send();
+ }
+ console.log("Sending room", roomId);
+ // could also use server-side rendering to create the HTML
+ // that way, we could embed the room code
+ // and existing chat messages in the generated HTML
+ // but the client can also get the roomId from the URL
+ // and use Ajax to request the messages on load
+ res.sendFile("public/room.html", { root: __dirname });
+});
+
+// if you need to do things like associate a socket with a logged in user, see
+// https://socket.io/how-to/deal-with-cookies
+// to see how you can fetch application cookies from the socket
+
+io.on("connection", (socket) => {
+ console.log(`Socket ${socket.id} connected`);
+
+ // extract room ID from URL
+ // could also send a separate registration event to register a socket to a room
+ // might want to do that ^ b/c not all browsers include referer, I think
+ let url = socket.handshake.headers.referer;
+ let pathParts = url.split("/");
+ let roomId = pathParts[pathParts.length - 1];
+ console.log(pathParts, roomId);
+
+ // room doesn't exist - this should never happen, but jic
+ if (!rooms.hasOwnProperty(roomId)) {
+ return;
+ }
+
+ // add socket object to room so other sockets in same room
+ // can send messages to it later
+ rooms[roomId][socket.id] = socket;
+
+ /* MUST REGISTER socket.on(event) listener FOR EVERY event CLIENT CAN SEND */
+
+ socket.on("disconnect", () => {
+ // disconnects are normal; close tab, refresh, browser freezes inactive tab, ...
+ // want to clean up global object, or else we'll have a memory leak
+ // WARNING: sockets don't always send disconnect events
+ // so you may want to periodically clean up your room object for old socket ids
+ console.log(`Socket ${socket.id} disconnected`);
+ delete rooms[roomId][socket.id];
+ });
+
+ socket.on("foo", ({ message }) => {
+ // we still have a reference to the roomId defined above
+ // b/c this function is defined inside the outer function
+ console.log(`Socket ${socket.id} sent message: ${message}, ${roomId}`);
+ console.log("Broadcasting message to other sockets");
+
+ // this would send the message to all other sockets
+ // but we want to only send it to other sockets in this room
+ // socket.broadcast.emit("message", message);
+
+ for (let otherSocket of Object.values(rooms[roomId])) {
+ // don't need to send same message back to socket
+ // socket.broadcast.emit automatically skips current socket
+ // but since we're doing this manually, we need to do it ourselves
+ if (otherSocket.id === socket.id) {
+ continue;
+ }
+ console.log(`Sending message ${message} to socket ${otherSocket.id}`);
+ otherSocket.emit("bar", message);
+ }
+ });
+
+ socket.on("hello", (data) => {
+ console.log(data);
+ });
+});
+
+let host = "localhost";
+let port = 3000;
+server.listen(port, host, () => {
+ console.log(`http://${host}:${port}`);
+});