[Pkg-javascript-devel] Babel 7

[Xavier]

Hi,

babel 7 is required by a lot of packages. At least tap=14 for its yaml
dependency (to be packaged separately), mathjax,...

Upgrading babel needs babel itself. I discussed this with @praveen and
we didn't see a better way than embedding babel-7 in babel to compile it
(there are more steps than for rollup including some beta releases).

Has anyone a better idea ?