SourceMap not working with grunt-contrib-concat/grunt-contrib-uglify

[nishantkmr]

The grunt-babel plugin generates the .map files mapping back to the ES6 source files but when trying to combine this with grunt-contrib-concat/grunt-contrib-uglify, I can only get a mapping back to the ES5 output, not to the original ES6 sources.

[Waltari10]

Let me know if you found a solution for this. Thanks!

[Waltari10]

      options: {
        sourceMap: true,
        inputSourceMap: grunt.file.readJSON(env.MINIFIED_FILE_PATH + env.MINIFIED_FILE_NAME + '.js.map')
      },

This should work.

[rorysmorris]

If anyone stumbles across this hoping for a solution, I suggest looking at Prayag Verma's answer here: https://stackoverflow.com/questions/32571058/grunt-babel-multiple-files-and-preserve-source-mapping

BenJamin's comment (and jsbin link) on this answer helps, too.