How do I enable private methods?

I’m surprised they aren’t enabled by default? because ember-cli-babel has them 🙃

but anywho, I have this error in C.I.: https://github.com/NullVoxPopuli/ember-array-map-resource/pull/103/checks?check_run_id=3702630696#step:5:215

 - originalErrorMessage: /home/runner/work/ember-array-map-resource/ember-array-map-resource/-private/resources/array-map.ts: Class private methods are not enabled.
  20 |
  21 |   // @private
> 22 |   get #records(): Element[] {
     |   ^
  23 |     return this.args.positional[0];
  24 |   }
  25 |
  - stack: SyntaxError: /home/runner/work/ember-array-map-resource/ember-array-map-resource/-private/resources/array-map.ts: Class private methods are not enabled.

Classic build works just fine with private fields: https://github.com/NullVoxPopuli/ember-array-map-resource/pull/103/checks?check_run_id=3702630588

[rwjblue]

I believe this is the same thing I described in https://github.com/babel/ember-cli-babel/issues/419#issuecomment-971787156, since we use ember-cli-babel for compilation still we’re going to have the same issue.

[courajs]

Been running into this as well. Discovered @embroider/webpack depends on the old pre-release version of babel’s preset env. babel-preset-env has been deprecated in favor of @babel/preset-env. Looks like the new versions use plugin-proposal-private-methods: https://github.com/babel/babel/blob/87fc2e76d77b0bc78b76cced469bd64c5edf141f/packages/babel-preset-env/package.json#L37 But the pre-release package doesn’t: https://github.com/babel/babel-preset-env/blob/31f33e3656e1bd8036317c54128fdc2812a2e8aa/package.json#L24

So I believe the solution is to migrate from babel-preset-env to @babel/preset-env