ExtractTextPlugin doesn't generate any file when the application is launched from Visual Studio and the isDevBuild variable is set to false in webpack.config.js #1229

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1. SteveSandersonMS commented on Aug 25, 2017

   

   SteveSandersonMS

   on Aug 25, 2017

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   By default, Webpack dev middleware (and hence the runtime webpack build) only runs when the application is in Development environment. If you want to perform a webpack build at some other time (e.g., when your application is in Staging environment), then it's up to you to do so manually, e.g., using webpack on the command line, or by publishing your application using dotnet publish or VS's "Publish" UI, which also performs a webpack build for you.

   If you just want to turn off HMR, you only need to change the HotModuleReplacement = true option to false in the WebpackDevMiddlewareOptions in your Startup.cs. You don't have to change any Webpack config or which environment your application runs in.
2. SteveSandersonMS

   closed this as completedon Aug 25, 2017
3. rskopal commented on Aug 28, 2017

   

   rskopal

   on Aug 28, 2017

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   Thanks for your answer, I didn't notice that the main.js wasn't also generated. I solved the problem by creating two launchSettings configurations in VS, IIS Express and IIS Express Staging, the latter one has the ASPNETCORE_ENVIRONMENT variable set to Staging. Because I'm afraid I'll forget to manually run webpack build after each switch to IIS Express Staging, I added this to the Startup:

   if (env.IsDevelopment()) { ... }
   else if (env.IsStaging())
   {
     app.UseWebpackDevMiddleware(new WebpackDevMiddlewareOptions
     {
       HotModuleReplacement = false,
       ReactHotModuleReplacement = false,
     });
   } else { ... }
   

   It works well, but after each switching I also have to set the isDevBuild flag directly to false in the webpack.config.js. It would be nice if I could send some parameters to webpack from the Startup, as it is mentioned in comments for the createWebpackDevServer() function in WebpackDevMiddleware.ts or here #816, e.g.:

   app.UseWebpackDevMiddleware(new WebpackDevMiddlewareOptions
   {
   	HotModuleReplacement = false,
   	ReactHotModuleReplacement = false,
   	EnvironmentVariables = new Dictionary<string, string>()
   	{
   	  { "isStagingBuild", "true" }
   	}
   });