browserslist and babel-preset-env

Currently, we default a browser list config for babel-preset-env. I’m not sure if it’s possible yet (https://github.com/babel/babel-preset-env/pull/161), but it would be great if we allowed this to be configured via the browserslist config key in package.json (https://github.com/ai/browserslist).

[weaverryan]

As of Encore 0.21.0, the browserslist config is respected by Babel 😃

[Nemo64]

how about configuring babel like this?:

    .configureBabel(function(babelConfig) {
        babelConfig.presets[0][1].targets.browsers = require('browserslist')();
    })

This will get the browserlist from the environment which is what we want. I’m not sure how i can validate if that actually works as I expect.

EDIT: I figured a way out to test it. So you can set babelConfig.presets[0][1].debug = true which will output which polyfills and (if included) plugins are used but also “using targets”. As far as I can tell, they match my browser list which basically is “defaults, IE >= 9, not OperaMini all”. Mobile browsers are for some reason absent but that seems to be normal for babel.

So yes: I think my way works. But it seems too easy.