Can we opt-in to shipped ES proposals via Webpack babel-loader?

[jamesallardice]

Currently Webpack fails to compile the code if you use e.g. a static class property (which is an ECMAScript feature supported natively by Node 14). The @babel/preset-env transform also supports the parsing of static class properties if we opt-in with the shippedProposals option.

However, adding shippedProposals doesn't fix the Webpack compilation error. This may be because Webpack is using a different Babel config (inside the Webpack config) but I haven't had a chance to look into it any further yet.