breaking change in @babel/preset-env 7.4.0

[andreineculau]

Bug Report

Current Behavior
isPluginRequired is not exported anymore from @babel/preset-env

Input Code

let {isPluginRequired} = require('babel-preset-env');

Expected behavior/code

isPluginRequired would be a function, not undefined, with the same signature as before.

Babel Configuration (.babelrc, package.json, cli command)

Environment

Possible Solution

Whether functions like isPluginRequired were intended or not to be exposed is a matter of its own, but such a refactoring should not be done in a minor-version bump.

Additional context/Screenshots

[babel-bot]

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[andreineculau]

ping @nicolo-ribaudo @zloirock

[zloirock]

Is this a public API?

[hzoo]

Ok either way (if we wanted it to be public API or not) that was unintentional to remove a previously exported function. Nicolò made a PR