Allow explicit configuration of port number for webpack dev middleware server. Fixes #223.

src/Microsoft.AspNetCore.SpaServices/Webpack/WebpackDevMiddlewareOptions.cs

@@ -3,6 +3,7 @@ namespace Microsoft.AspNetCore.SpaServices.Webpack
     public class WebpackDevMiddlewareOptions
     {
         public bool HotModuleReplacement { get; set; }
+        public int HotModuleReplacementServerPort { get; set; }
         public bool ReactHotModuleReplacement { get; set; }
         public string ConfigFile { get; set; }
     }

src/Microsoft.AspNetCore.SpaServices/npm/aspnet-webpack/package.json

@@ -1,6 +1,6 @@
 {
   "name": "aspnet-webpack",
-  "version": "1.0.7",
+  "version": "1.0.8",
   "description": "Helpers for using Webpack in ASP.NET Core projects. Works in conjunction with the Microsoft.AspNetCore.SpaServices NuGet package.",
   "main": "index.js",
   "scripts": {

src/Microsoft.AspNetCore.SpaServices/npm/aspnet-webpack/src/WebpackDevMiddleware.ts

@@ -16,6 +16,7 @@ interface CreateDevServerOptions {
 // These are the options configured in C# and then JSON-serialized, hence the C#-style naming
 interface DevServerOptions {
     HotModuleReplacement: boolean;
+    HotModuleReplacementServerPort: number;
     ReactHotModuleReplacement: boolean;
 }
 
@@ -35,9 +36,11 @@ export function createWebpackDevServer(callback: CreateDevServerCallback, option
         return;
     }
 
+    // The default value, 0, means 'choose randomly'
+    const suggestedHMRPortOrZero = options.suppliedOptions.HotModuleReplacementServerPort;
+
     const app = connect();
-    const defaultPort = 0; // 0 means 'choose randomly'. Could allow an explicit value to be supplied instead.
+    const listener = app.listen(suggestedHMRPortOrZero, () => {
-    const listener = app.listen(defaultPort, () => {
         // Build the final Webpack config based on supplied options
         if (enableHotModuleReplacement) {
             // TODO: Stop assuming there's an entry point called 'main'