Add type definitions for koa-websocket (#16221)

types/koa-websocket/index.d.ts

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+// Type definitions for koa-websocket 2.1
+// Project: https://github.com/kudos/koa-websocket
+// Definitions by: My Self <https://github.com/me>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.2
+
+import * as Koa from 'koa';
+import * as ws from 'ws';
+import * as http from 'http';
+import * as https from 'https';
+
+type KoaWebsocketConnectionHandler = (socket: ws) => void;
+type KoaWebsocketMiddleware = (this: KoaWebsocketMiddlewareContext, context: Koa.Context, next: () => Promise<any>) => any;
+interface KoaWebsocketMiddlewareContext extends Koa.Context {
+    websocket: ws;
+    path: string;
+}
+
+declare class KoaWebsocketServer {
+    app: Koa;
+    middleware: Koa.Middleware[];
+
+    constructor(app: Koa);
+    listen(server: http.Server | https.Server): ws.Server;
+    onConnection(handler: KoaWebsocketConnectionHandler): void;
+    use(middleware: KoaWebsocketMiddleware): this;
+}
+
+interface KoaWebsocketApp extends Koa {
+    ws: KoaWebsocketServer;
+}
+
+type KoaWebsockets = (app: Koa) => KoaWebsocketApp;
+
+declare const websockets: KoaWebsockets;
+export = websockets;

types/koa-websocket/koa-websocket-tests.ts

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+import * as Koa from 'koa';
+import * as websocket from 'koa-websocket';
+
+const app = websocket(new Koa());
+
+app.ws.use(async function(context, next) {
+    this.websocket.on('message', (message) => {
+        console.log(message);
+    });
+    this.websocket.send('Hello world');
+    await next();
+});
+
+app.listen(3000);

types/koa-websocket/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "koa-websocket-tests.ts"
+    ]
+}

types/koa-websocket/tslint.json

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+{ "extends": "dtslint/dt.json" }