Skip single file from Minifying?

So the issue is that all the files are bundled together, and then the entire bundle is minimized. As a result you aren't going to easily be able to skip minification of just one file. Probably the best way to do this would be to create a new Transform that appended the contents of this file you want unminified. Then you would append this Transform to your registered ScriptBundle:

commonBundle.Transforms.Add(new AppendFileTransform(""~/Scripts/jquery-ui/jquery-ui-timepicker-addon.js""));

AppendFileTransform would simply append the contents of the file to the bundled response. You would no longer include the timepicker in the bundle explicitly, but instead this transform would be including it, and this would effectively give you the behavior you are looking since the JsMinify transform would run first and minify the bundle, and then you would add the file you want at the end unminified.

This can be solved better from the other direction - instead of trying to not minify a single file, add transforms for individual items instead.

First - create a class that implements IItemTransform and uses the same code to minify the given input:

public class JsItemMinify : System.Web.Optimization.IItemTransform
{
    public string Process(string includedVirtualPath, string input)
    {
        var min = new Microsoft.Ajax.Utilities.Minifier();
        var result = min.MinifyJavaScript(input);
        if (min.ErrorList.Count > 0)
            return "/*minification failed*/" + input;

        return result;
    }
}

Second - add this item transform to the individual files and remove the bundle transform:

var commonBundle= new Bundle("~/CommonJS");
// the first two includes will be minified
commonBundle.Include("~/Scripts/jquery-1.7.2.js", new JsItemMinify());
commonBundle.Include("~/Scripts/jquery-ui-1.8.22.js", new JsItemMinify());

// this one will not
commonBundle.Include("~/Scripts/jquery.cookie.js");

// Remove the default JsMinify bundle transform
commonBundle.Transforms.Clear();

BundleTable.Bundles.Add(commonBundle);