Add sourceMapURL and sourceMapRootpath options

[donaldpipowitch]

It looks like grunt-contrib-uglifiy doesn't support the options sourceMapURL and sourceMapRootpath for generating source maps. This is a feature supported by grunt-contrib-less which is really handy.
E.g. I use two connect servers for development: one for the app itself and one to serve the source maps. (So my app can't accidentally get the source files. And I can use one source maps server for multiple versions of my app - like production and release version - as the source files are the same.)

It would be really nice if grunt-contrib-uglifiy could include these options. (It seems that uglifiy supports them internally? But I can't find a way to pass these options with this grunt plugin.)

Note: I made the same request for gruntjs/grunt-contrib-concat#92 (including some examples to show the difference).

[donaldpipowitch]

FYI: It looks like UglifyJS has these options built-in: https://github.com/mishoo/UglifyJS2

[RReverser]

👍

Please return sourceMapRoot. It's important to be able to customize it. For example, I used following configuration:

sourceMapRoot: (
  process.env.CI
  ? 'https://raw.github.com/'+process.env.TRAVIS_REPO_SLUG+'/'+process.env.TRAVIS_COMMIT
  : '../..'
)

This allows to build releases on CI differently so source maps point to sources at Github instead of local ones. And since sourceMapRoot is removed, this is no more possible.