diff --git a/types/webpack-dev-server/index.d.ts b/types/webpack-dev-server/index.d.ts
index 48abc9a44c..30fd2482e7 100644
--- a/types/webpack-dev-server/index.d.ts
+++ b/types/webpack-dev-server/index.d.ts
@@ -5,6 +5,7 @@
 //                 Zheyang Song <https://github.com/ZheyangSong>
 //                 Alan Agius <https://github.com/alan-agius4>
 //                 Artur Androsovych <https://github.com/arturovt>
+//                 Dave Cardwell <https://github.com/davecardwell>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.3
 
@@ -165,6 +166,8 @@ declare namespace WebpackDevServer {
         watchContentBase?: boolean;
         /** Control options related to watching the files. */
         watchOptions?: webpack.WatchOptions;
+        /** Tells devServer to write generated assets to the disk. */
+        writeToDisk?: boolean | ((filePath: string) => boolean);
     }
 }
 
diff --git a/types/webpack-dev-server/webpack-dev-server-tests.ts b/types/webpack-dev-server/webpack-dev-server-tests.ts
index f570dd134e..755245b035 100644
--- a/types/webpack-dev-server/webpack-dev-server-tests.ts
+++ b/types/webpack-dev-server/webpack-dev-server-tests.ts
@@ -72,6 +72,7 @@ const config: WebpackDevServer.Configuration = {
         aggregateTimeout: 300,
         poll: 1000
     },
+    writeToDisk: true,
     // It's a required option.
     publicPath: "/assets/",
     headers: { "X-Custom-Header": "yes" }
@@ -83,6 +84,9 @@ const c2: WebpackDevServer.Configuration = {
 const c3: WebpackDevServer.Configuration = {
     stats: "verbose",
 };
+const c4: WebpackDevServer.Configuration = {
+    writeToDisk: (filePath: string) => true,
+};
 
 // API example
 server = new WebpackDevServer(compiler, config);