diff --git a/types/webpack-hot-client/index.d.ts b/types/webpack-hot-client/index.d.ts
index c8e6500394..e74dd9cf8d 100644
--- a/types/webpack-hot-client/index.d.ts
+++ b/types/webpack-hot-client/index.d.ts
@@ -1,54 +1,72 @@
-// Type definitions for webpack-hot-client 4.0
+// Type definitions for webpack-hot-client 4.1
 // Project: https://github.com/webpack-contrib/webpack-hot-client
 // Definitions by: Ryan Clark <https://github.com/rynclark>
 //                 ZSkycat <https://github.com/ZSkycat>
+//                 Brian Armstrong <https://github.com/barm>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.3
 
 /// <reference types="node" />
 
-import * as webpack from 'webpack';
 import * as net from 'net';
+import * as webpack from 'webpack';
+import { Server } from 'ws';
 
 export = WebpackHotClient;
 
 declare function WebpackHotClient(
-  compiler: webpack.Compiler | webpack.MultiCompiler,
-  options: WebpackHotClient.Options
-): void;
+    compiler: webpack.Compiler | webpack.MultiCompiler,
+    options: WebpackHotClient.Options,
+): WebpackHotClient.Client;
 
 declare namespace WebpackHotClient {
-  interface WebpackHotHost {
-    /** Client hostname that is used in the browser by WebSockets */
-    client: string;
-    /** Server hostname */
-    server: string;
-  }
+    interface WebSocketServer extends Server {
+        /** Forwards a message to each open client on the WebSocketServer */
+        broadcast(data: any): void;
+        /** Processes stats and sends messages through broadcast() */
+        send(stats: webpack.Stats): void;
+    }
 
-  interface Options {
-    /** Automatically configure every entry */
-    allEntries?: boolean;
-    /** Auto configure the given webpack config with the hot configuration */
-    autoConfigure?: boolean;
-    /** Level of information for webpack-hot-client to output */
-    host?: WebpackHotHost | string;
-    /** Enable hot module reloading */
-    hmr?: boolean;
-    /** Enable HTTPS */
-    https?: boolean;
-    /** Level of information for webpack-hot-client to output */
-    logLevel?: 'trace' | 'debug' | 'info' | 'warn' | 'error' | 'silent';
-    /** Prepend timestamp to each log line */
-    logTime?: boolean;
-    /** Port that the WebSocket listens on */
-    port?: number;
-    /** Reload the page if a patch cannot be applied by webpack */
-    reload?: boolean;
-    /** Server instance for webpack-hot-client to connect to */
-    server?: net.Server;
-    /** Webpack stats configuration */
-    stats?: webpack.Options.Stats;
-    /** Webpack compile target */
-    validTargets?: string[];
-  }
+    interface Client {
+        /** Function that closes the WebSocketServer opened by the module. */
+        close(callback?: () => void): void;
+        /** WebSocketServer instance with some hot-client specific method overrides */
+        server: WebSocketServer;
+        /** Readonly version of the options after applying defaults */
+        options: Readonly<Options>;
+    }
+
+    interface WebpackHotHost {
+        /** Client hostname that is used in the browser by WebSockets */
+        client: string;
+        /** Server hostname */
+        server: string;
+    }
+
+    interface Options {
+        /** Automatically configure every entry */
+        allEntries?: boolean;
+        /** Auto configure the given webpack config with the hot configuration */
+        autoConfigure?: boolean;
+        /** Host that the WebSocket listens on */
+        host?: WebpackHotHost | string;
+        /** Enable hot module reloading */
+        hmr?: boolean;
+        /** Enable HTTPS */
+        https?: boolean;
+        /** Level of information for webpack-hot-client to output */
+        logLevel?: 'trace' | 'debug' | 'info' | 'warn' | 'error' | 'silent';
+        /** Prepend timestamp to each log line */
+        logTime?: boolean;
+        /** Port that the WebSocket listens on */
+        port?: number;
+        /** Reload the page if a patch cannot be applied by webpack */
+        reload?: boolean;
+        /** Server instance for webpack-hot-client to connect to */
+        server?: net.Server;
+        /** Webpack stats configuration */
+        stats?: webpack.Options.Stats;
+        /** Webpack compile target */
+        validTargets?: string[];
+    }
 }
diff --git a/types/webpack-hot-client/webpack-hot-client-tests.ts b/types/webpack-hot-client/webpack-hot-client-tests.ts
index 433c704030..62816fdc63 100644
--- a/types/webpack-hot-client/webpack-hot-client-tests.ts
+++ b/types/webpack-hot-client/webpack-hot-client-tests.ts
@@ -5,4 +5,11 @@ const compiler = webpack();
 
 hot(compiler, { logLevel: 'info', reload: false });
 
-hot(compiler, { logLevel: 'info', reload: false, validTargets: ['web', 'node'] });
+const client = hot(compiler, { logLevel: 'info', reload: false, validTargets: ['web', 'node'] });
+
+const { close, server, options} = client;
+
+close(() => {});
+server.on('listening', () => {});
+server.broadcast({type: 'message'});
+const entries = options.allEntries;