FAQTroubleshootingWhy could I not see the original JS file in stacktrace with source map?

It is possible that, you have enabled source map for the uglify task, but haven't done it for the concat task. If you are using grunt, adding following lines in your grunt file will map original source file.

concat: {
    options: {
        sourceMap: true
    }
},

uglify: {
    options: {
        sourceMap: true,
        sourceMapIncludeSources: true,
        sourceMapIn: function(uglifySource) {
            return uglifySource + '.map';
        }
    },
    dist: {
    }
}