Unable to see original JS file in stack trace 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 the following lines in your grunt file will map original source file.

copy

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

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

        }
    }
}