Full source maps for builds

[guybedford]

Support picking up and then re-mapping the source maps from individual files through into the concat build.

[dypsilon]

What is the state of sourcemaps right now? Are they produced at all?

[guybedford]

Currently SystemJS builder doesn't support source maps. It should be relatively straightforward to set up though as each of the compile processes supports source maps. Should be possible to do within a day or less, but days are hard to find!

[jamespamplin]

+1 for source maps support. Very useful for debugging.

[cutandpastey]

+1 If you can't get to this could you give me a point in the right direction?

[martinmicunda]

+1

[guybedford]

Completed, with thanks to @crisptrutski.

[Rush]

I feel that input source maps of individual modules are not being passed to the final build (for example I can see the sourceMap tag when viewing sources of modules in chrome), is it a bug or lack of feature?

[guybedford]

@Rush good point, created #297.