Here's how to disable minification on a per-bundle basis:
bundles.Add(new StyleBundleRaw("~/Content/foobarcss").Include("/some/path/foobar.css"));
bundles.Add(new ScriptBundleRaw("~/Bundles/foobarjs").Include("/some/path/foobar.js"));
Sidenote: The paths used for your bundles must not coincide with any actual path in your published builds otherwise nothing will work. Also make sure to avoid using .js, .css and/or '.' and '_' anywhere in the name of the bundle. Keep the name as simple and as straightforward as possible, like in the example above.
The helper classes are shown below. Notice that in order to make these classes future-proof we surgically remove the js/css minifying instances instead of using .clear() and we also insert a mime-type-setter transformation without which production builds are bound to run into trouble especially when it comes to properly handing over css-bundles (firefox and chrome reject css bundles with mime-type set to "text/html" which is the default):
internal sealed class StyleBundleRaw : StyleBundle
{
private static readonly BundleMimeType CssContentMimeType = new BundleMimeType("text/css");
public StyleBundleRaw(string virtualPath) : this(virtualPath, cdnPath: null)
{
}
public StyleBundleRaw(string virtualPath, string cdnPath) : base(virtualPath, cdnPath)
{
Transforms.Add(CssContentMimeType); //0 vital
Transforms.Remove(Transforms.FirstOrDefault(x => x is CssMinify)); //0
}
//0 the guys at redmond in their infinite wisdom plugged the mimetype "text/css" right into cssminify upon unwiring the minifier we
// need to somehow reenable the cssbundle to specify its mimetype otherwise it will advertise itself as html and wont load
}
internal sealed class ScriptBundleRaw : ScriptBundle
{
private static readonly BundleMimeType JsContentMimeType = new BundleMimeType("text/javascript");
public ScriptBundleRaw(string virtualPath) : this(virtualPath, cdnPath: null)
{
}
public ScriptBundleRaw(string virtualPath, string cdnPath) : base(virtualPath, cdnPath)
{
Transforms.Add(JsContentMimeType); //0 vital
Transforms.Remove(Transforms.FirstOrDefault(x => x is JsMinify)); //0
}
//0 the guys at redmond in their infinite wisdom plugged the mimetype "text/javascript" right into jsminify upon unwiring the minifier we need
// to somehow reenable the jsbundle to specify its mimetype otherwise it will advertise itself as html causing it to be become unloadable by the browsers in published production builds
}
internal sealed class BundleMimeType : IBundleTransform
{
private readonly string _mimeType;
public BundleMimeType(string mimeType) { _mimeType = mimeType; }
public void Process(BundleContext context, BundleResponse response)
{
if (context == null)
throw new ArgumentNullException(nameof(context));
if (response == null)
throw new ArgumentNullException(nameof(response));
response.ContentType = _mimeType;
}
}
To make this whole thing work you need to install (via nuget):
WebGrease 1.6.0+
Microsoft.AspNet.Web.Optimization 1.1.3+
And your web.config should be enriched like so:
<runtime>
[...]
<dependentAssembly>
<assemblyIdentity name="System.Web.Optimization" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-x.y.z.t" newVersion="x.y.z.t" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="WebGrease" publicKeyToken="31bf3856ad364e35" culture="neutral" />
<bindingRedirect oldVersion="0.0.0.0-x.y.z.t" newVersion="x.y.z.t" />
</dependentAssembly>
[...]
</runtime>
<!-- setting mimetypes like we do right below is absolutely vital for published builds because for some reason the -->
<!-- iis servers in production environments somehow dont know how to handle otf eot and other font related files -->
<system.webServer>
[...]
<staticContent>
<!-- in case iis already has these mime types -->
<remove fileExtension=".otf" />
<remove fileExtension=".eot" />
<remove fileExtension=".ttf" />
<remove fileExtension=".woff" />
<remove fileExtension=".woff2" />
<mimeMap fileExtension=".otf" mimeType="font/otf" />
<mimeMap fileExtension=".eot" mimeType="application/vnd.ms-fontobject" />
<mimeMap fileExtension=".ttf" mimeType="application/octet-stream" />
<mimeMap fileExtension=".woff" mimeType="application/font-woff" />
<mimeMap fileExtension=".woff2" mimeType="application/font-woff2" />
</staticContent>
<!-- also vital otherwise published builds wont work https://mcmap.net/q/129475/-asp-net-mvc-framework-4-5-css-bundle-does-not-work-on-the-hosting -->
<modules runAllManagedModulesForAllRequests="true">
<remove name="BundleModule" />
<add name="BundleModule" type="System.Web.Optimization.BundleModule" />
</modules>
[...]
</system.webServer>
Note that you might have to take extra steps to make your css-bundles work in terms of fonts etc. But that's a different story.
