generateSourceMaps adds two sourceMappingURL

[rockResolve]

Reinstalling gulp-durandal and using generateSourceMaps I got two sourceMappingURLs, the first one bogus. When compilng main I got:

 //# sourceMappingURL=main-built.js
 //# sourceMappingURL="my real output filename".map

I tracked it down to an update of RequireJs to version 2.4.16.
Raised issue requirejs/r.js#802

Depending on the fix, the rjsConfig.out function rjsCb could be replaced by just options.output string.

Work around

In gulp-durandal index.js rjsCb function

        if (sourceMapText) {
            //Awaiting fix of https://github.com/jrburke/r.js/issues/802
            text = text.replace(/\n\/\/# sourceMappingURL=.+?$/, '');

            text += '//# sourceMappingURL=' + path.basename(mapOutput);
        }

[spikyturtle]

I was having the same problem. Thanks @rockResolve for the work around.