Add socket.io-emitter types (#39038)

types/socket.io-emitter/index.d.ts

@@ -0,0 +1,53 @@
+// Type definitions for socket.io-emitter 3.1
+// Project: https://github.com/socketio/socket.io-emitter#readme
+// Definitions by: Ben Salili-James <https://github.com/benhjames>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+declare namespace init {
+    /**
+     * The Redis client passed to `socket.io-emitter` only requires the `publish`
+     * method, so accept any client that implements this.
+     */
+    interface RedisClient {
+        publish: (channel: string, message: string) => Promise<any>;
+    }
+
+    class SocketIOEmitter {
+        redis: RedisClient;
+        prefix: string;
+        nsp: string;
+        channel: string;
+
+        private _rooms: string[];
+        private _flags: Record<'broadcast' | 'json' | 'volatile', boolean | undefined>;
+
+        // TypeScript Version: 3.6
+        get broadcast(): this;
+
+        // TypeScript Version: 3.6
+        get json(): this;
+
+        // TypeScript Version: 3.6
+        get volatile(): this;
+
+        in(room: string): this;
+        to(room: string): this;
+
+        of(nsp: string): SocketIOEmitter;
+
+        emit(...data: any[]): this;
+    }
+
+    type SocketIORedisOptions = { host: string; port: number } | { socket: string };
+
+    interface SocketIOEmitterOptions {
+        key?: string;
+    }
+}
+
+declare function init(
+    redisOptions: init.RedisClient | init.SocketIORedisOptions | string,
+    options?: init.SocketIOEmitterOptions,
+): init.SocketIOEmitter;
+
+export = init;

types/socket.io-emitter/socket.io-emitter-tests.ts

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+import ioEmitter = require('socket.io-emitter');
+
+const io1 = ioEmitter('localhost:6379');
+const io2 = ioEmitter('localhost:6379', { key: 'my-key' });
+const io3 = ioEmitter({ host: 'localhost', port: 6379 }, { key: 'my-key' });
+
+io1.emit('broadcast', 'hello');
+
+io2.to('game').emit('new-game', 'testing');
+
+const nsp = io3.of('/admin');
+
+nsp.emit('namespace', 'hello namespace');
+
+nsp.to('notifications').emit('namespace', 'hello notifications in namespace');
+
+io1.broadcast.json.volatile;

types/socket.io-emitter/tsconfig.json

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

types/socket.io-emitter/tslint.json

@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }