Switch to babel-preset-env

[luboskmetko]

https://github.com/babel/babel-preset-env

This is recommend by Babel itself during installation of our current babel-preset-es2015

[jakub300]

I spent some time testing it today and I recommend waiting until babel v7 is released. Reasons:

• we will not benefit from browsers list based transforms anyway because we need them all to be compatible with uglifyjs,
• in v7 babel-preset-env will make it possible to share browserslist config with autoprefixer, they must be defined separately now,
• in v7 we may use automatic polyfilling for things like Promises, Array.from etc., that is not possible in current version.

[luboskmetko]

@jakub300 babel v7 is out, do you think you would find time to work on this?

[jakub300]

Hey, unfortunately not in the near future. Update to eslint-config-chisel was to match parser version used by eslint and chisel. I have WiP branch with update in the office. I will push it tomorrow.