Commits on Dec 8, 2021

1. Properly handle class properties proposal …

   Historically, we only add the `@babel/plugin-proposal-class-properties`
   so that we make sure the ordering is right with the decorators proposal
   (otherwise, it can end up compiling in the wrong order). With a recent
   version of `@babel/preset-env` and, transitively, `caniuse-lite`, this
   resulted in cases where we added that plugin but *not* related plugins
   for private class properties, which in turn triggered a Babel assertion
   about not adding the properties together as appropriate when the caniuse
   database (correctly) reported that .
   
   The fix is:
   
   1.  Bump to a more recent version of `@babel/preset-env`, which comes
       with a correspondingly bumped version of `caniuse-lite`, which in
       turn correctly understands what the latest versions of targeted
       browsers are.
   
   2.  Include in `ember-cli-babel` itself a check for whether we even
       *need* to add the plugin, and only provide it when the provided
       `targets` indicate that they require it.
   
   Resolves emberjs#419

   

   chriskrycho authored and rwjblue committed Dec 8, 2021
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