Fix Shards in browser environments (abalabahaha#1001)

lib/gateway/Shard.js

@@ -12,7 +12,7 @@ const ExtendedUser = require("../structures/ExtendedUser");
 const User = require("../structures/User");
 const Invite = require("../structures/Invite");
 const Constants = require("../Constants");
-let WebSocket = typeof window !== "undefined" ? window.WebSocket : require("ws");
+let WebSocket = typeof window !== "undefined" ? require("../util/BrowserWebSocket") : require("ws");
 
 let EventEmitter;
 try {

lib/util/BrowserWebSocket.js

@@ -0,0 +1,69 @@
+let EventEmitter;
+try {
+    EventEmitter = require("eventemitter3");
+} catch(err) {
+    EventEmitter = require("events").EventEmitter;
+}
+
+class BrowserWebSocketError extends Error {
+    constructor(message, event) {
+        super(message);
+        this.event = event;
+    }
+}
+
+/**
+* Represents a browser's websocket usable by Eris
+* @extends EventEmitter
+* @prop {string} url The URL to connect to
+*/
+class BrowserWebSocket extends EventEmitter {
+    constructor(url) {
+        super();
+
+        if(typeof window === "undefined") {
+            throw new Error("BrowserWebSocket cannot be used outside of a browser environment");
+        }
+
+        this._ws = new window.WebSocket(url);
+        this._ws.onopen = () => this.emit("open");
+        this._ws.onmessage = this._onMessage.bind(this);
+        this._ws.onerror = (event) => this.emit("error", new BrowserWebSocketError("Unknown error", event));
+        this._ws.onclose = (event) => this.emit("close", event.code, event.reason);
+    }
+
+    async _onMessage(event) {
+        if(event.data instanceof window.Blob) {
+            this.emit("message", await event.data.arrayBuffer());
+        } else {
+            this.emit("message", event.data);
+        }
+    }
+
+    get readyState() {
+        return this._ws.readyState;
+    }
+
+    send(data) {
+        return this._ws.send(data);
+    }
+
+    close(code, reason) {
+        return this._ws.close(code, reason);
+    }
+
+    terminate() {
+        return this._ws.close();
+    }
+
+    removeEventListener(type, listener) {
+        return this.removeListener(type, listener);
+    }
+}
+
+BrowserWebSocket.CONNECTING = 0;
+BrowserWebSocket.OPEN = 1;
+BrowserWebSocket.CLOSING = 2;
+BrowserWebSocket.CLOSED = 3;
+
+module.exports = BrowserWebSocket;

lib/voice/VoiceConnection.js

@@ -8,7 +8,7 @@ const Piper = require("./Piper");
 const VoiceDataStream = require("./VoiceDataStream");
 const {createOpus} = require("../util/Opus");
 
-let WebSocket = typeof window !== "undefined" ? window.WebSocket : require("ws");
+let WebSocket = typeof window !== "undefined" ? require("../util/BrowserWebSocket") : require("ws");
 
 let EventEmitter;
 try {