docs(examples): add example with TypeScript

There are two issues with the typings:

- on the client-side, the Emitter class is not properly imported (hence the @ts-ignore)
- on the server-side, the Socket class is not exported (in order to cast it in the "connect" event)

examples/typescript/client.ts

@@ -0,0 +1,21 @@
+import { Manager } from "socket.io-client";
+
+const manager = new Manager("ws://localhost:8080", {});
+const socket = manager.socket("/");
+
+// @ts-ignore
+socket.on("connect", () => {
+    console.log(`connect ${socket.id}`);
+});
+
+// @ts-ignore
+socket.on("disconnect", () => {
+    console.log(`disconnect`);
+});
+
+setInterval(() => {
+    const start = Date.now();
+    socket.emit("ping", () => {
+        console.log(`pong (latency: ${Date.now() - start} ms)`);
+    });
+}, 1000);

examples/typescript/package.json

@@ -0,0 +1,17 @@
+{
+  "name": "typescript",
+  "version": "1.0.0",
+  "description": "An example with TypeScript",
+  "private": true,
+  "scripts": {
+    "start:server": "ts-node server.ts",
+    "start:client": "ts-node client.ts"
+  },
+  "author": "Damien Arrachequesne",
+  "license": "MIT",
+  "dependencies": {
+    "socket.io": "beta",
+    "socket.io-client": "beta",
+    "ts-node": "^9.0.0"
+  }
+}

examples/typescript/server.ts

@@ -0,0 +1,16 @@
+import { Server } from "socket.io";
+
+const io = new Server(8080);
+
+io.on("connect", (socket) => {
+    console.log(`connect ${socket.id}`);
+
+    socket.on("ping", (cb) => {
+        console.log("ping");
+        cb();
+    });
+
+    socket.on("disconnect", () => {
+        console.log(`disconnect ${socket.id}`);
+    });
+});