Why are My .min.js Files Ignored by ASP.NET MVC Bundling?

Solved the problem of ASP.NET MVC bundle ignoring .min.js file

The Razor view engine in ASP.NET MVC enables efficient JavaScript and CSS file management through bundling capabilities. However, a special problem may arise when bundling files with a .min.js extension: the bundler may ignore .min.js files and process normal .js files normally.

BundlerConfig class is used to configure the bundling process. In this class, you can define a script bundle, specifying the files to include. However, when a bundle contains a .min.js file, the bundle fails to render the file in the output.

The cause of this problem is the default ignore list maintained by the bundler. Files matching patterns in the list will be excluded from the bundle. By default, the ignore list contains patterns such as *.intellisense.js, *-vsdoc.js, etc. It also contains *.debug.js and *.min.js in OptimizationMode.WhenEnabled and OptimizationMode.WhenDisabled respectively.

To resolve this issue, you can rename jquery.tmpl.min.js to jquery.tmpl.js, or modify the ignore list to explicitly exclude *.min.js files. The latter method involves overriding the AddDefaultIgnorePatterns method to change the default ignore list:

<code class="language-csharp">public static void AddDefaultIgnorePatterns(IgnoreList ignoreList)
{
    if (ignoreList == null)
        throw new ArgumentNullException("ignoreList");
    ignoreList.Ignore("*.intellisense.js");
    ignoreList.Ignore("*-vsdoc.js");
    ignoreList.Ignore("*.debug.js", OptimizationMode.WhenEnabled);
    //ignoreList.Ignore("*.min.js", OptimizationMode.WhenDisabled);
    ignoreList.Ignore("*.min.css", OptimizationMode.WhenDisabled);
}</code>

By overriding this method and removing // from the line ignoreList.Ignore("*.min.js", OptimizationMode.WhenDisabled);, you can effectively exclude .min.js files from the ignore list. This modification fixes the issue by ensuring that the bundler includes files with a .min.js extension in the output.

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