[Pkg-javascript-devel] Bug#977607: auto detect rollup.config.js and rollup -c package.json#scripts#build

[Yadd]

Hi,

this thing is ready for a while but desactivated. For now, pkg-js-tools 
only detects Gruntfile.js but doesn't fail if grunt fails. Proposition:
  - autodetect all (rollup.config.js, Gruntfile.js, tsconfig.json,...)
  - fail if build fails. Then only packages with these files and without
    an "override_dh_auto_build" will fail, so just a few list and
    probably some bad package (such as libjs-angular-file-upload which
    was not really DFSG)

There are too many packages to reverse-build for my little computer then 
I propose to:
  * upload these change in experimental,
  * wait a few days for test
  * push pkg-js-tools to unstable
  * fix all FTBFS that will appear (probably just a few list, at least
    an empty "override_dh_auto_build" will fix the problem)

Cheers,
Yadd