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diff --git a/Collapse file
‎src/Microsoft.AspNetCore.SpaServices/Webpack/WebpackDevMiddlewareOptions.cs‎
Copy file name to clipboardExpand all lines: src/Microsoft.AspNetCore.SpaServices/Webpack/WebpackDevMiddlewareOptions.cs
+5Lines changed: 5 additions & 0 deletions b/Collapse file
‎src/Microsoft.AspNetCore.SpaServices/Webpack/WebpackDevMiddlewareOptions.cs‎
Copy file name to clipboardExpand all lines: src/Microsoft.AspNetCore.SpaServices/Webpack/WebpackDevMiddlewareOptions.cs
+5Lines changed: 5 additions & 0 deletions
diff --git a/Collapse file
‎src/Microsoft.AspNetCore.SpaServices/npm/aspnet-webpack/src/WebpackDevMiddleware.ts‎
Copy file name to clipboardExpand all lines: src/Microsoft.AspNetCore.SpaServices/npm/aspnet-webpack/src/WebpackDevMiddleware.ts
+2-1Lines changed: 2 additions & 1 deletion b/Collapse file
‎src/Microsoft.AspNetCore.SpaServices/npm/aspnet-webpack/src/WebpackDevMiddleware.ts‎
Copy file name to clipboardExpand all lines: src/Microsoft.AspNetCore.SpaServices/npm/aspnet-webpack/src/WebpackDevMiddleware.ts
+2-1Lines changed: 2 additions & 1 deletion
@@ -50,5 +50,10 @@ public class WebpackDevMiddlewareOptions
         /// the webpack compiler.
         /// </summary>
         public IDictionary<string, string> EnvironmentVariables { get; set; }
+
+        /// <summary>
+        /// Pass in the env parameter to webpack.
+        /// </summary>
+        public object EnvParam { get; set; }
     }
 }
@@ -32,6 +32,7 @@ interface DevServerOptions {
     HotModuleReplacementServerPort: number;
     HotModuleReplacementClientOptions: StringMap<string>;
     ReactHotModuleReplacement: boolean;
+    EnvParam: any;
 }
 
 // We support these three kinds of webpack.config.js export. We don't currently support exported promises
@@ -248,7 +249,7 @@ export function createWebpackDevServer(callback: CreateDevServerCallback, option
         // In the future, we could add support for configuring the 'env' param in Startup.cs. But right
         // now, it's not clear that people will want to do that (and they can always make up their own
         // default env values in their webpack.config.js).
-        webpackConfigExport = webpackConfigExport();
+        webpackConfigExport = webpackConfigExport(options.suppliedOptions.EnvParam);
     }
     const webpackConfigArray = webpackConfigExport instanceof Array ? webpackConfigExport : [webpackConfigExport];
Original file line number	Diff line number	Diff line change
`@@ -50,5 +50,10 @@ public class WebpackDevMiddlewareOptions`
`50`	`50`	`/// the webpack compiler.`
`51`	`51`	`/// </summary>`
`52`	`52`	`public IDictionary<string, string> EnvironmentVariables { get; set; }`
	`53`	`+`
	`54`	`+ /// <summary>`
	`55`	`+ /// Pass in the env parameter to webpack.`
	`56`	`+ /// </summary>`
	`57`	`+ public object EnvParam { get; set; }`
`53`	`58`	`}`
`54`	`59`	`}`