Fix import { types } from "@babel/core" with native ESM

[nicolo-ribaudo]

Q	A
Fixed Issues?	Fixes #1, Fixes #2
Patch: Bug Fix?
Major: Breaking Change?
Minor: New Feature?
Tests Added + Pass?	Yes
Documentation PR Link
Any Dependency Changes?
License	MIT

This is another step in the direction of #13414. It makes it possible to use named imports for types, tokTypes, traverse and template from @babel/core, which were not available because the Node.js CJS-ESM interop doesn't recognize our lazy reexports.

Basically this code:

Object.defineProperty(exports, "types", {
  enumerable: true,
  get: function () {
    return _types();
  }
});

Is replaced by this (which is detected by the Node.js interpo) by a custom plugin:

Object.defineProperty((0, exports), "types", {
  enumerable: true,
  get: function () {
    return _types();
  }
});
0 && (exports.types = 0);

The second commit removes the usage of @babel/core's default export in our tests, which in theory shouldn't exist.

[babel-bot]

Build successful! You can test your changes in the REPL here: https://babeljs.io/repl/build/52258/