using typescript targeting ES2022 (or newer likely) silently breaks @observable and @bindable (partially)

[mitchcapper]

I'm submitting a bug report
changing typescript from targeting ES2022 from ES2021 will silently break aurelia in some non-obvious ways. Any getters/setters done through prototyping are broken. Any getters/setters done afterworks succeed.

Simple view of the generated js and why its an issue: https://page.thepages.workers.dev/aurelia_cry

Simple repo from the default blank project: https://github.com/mitchcapper/aureliaV1_es2022_target_repo
and the single commit that differs from the empty project: 2e2b9c7d027574554a59a56834a8ee7c5b486ca1

change it from es2022 to es2021 and it is fixed. Note you must restart the webpack engine after the change it will not auto-pickup that.

Current behavior:
When targetting ES2022 things like observable decorators are broken

Expected/desired behavior:
Same as with ES2021 where they work without issue

I don't know if this effects V2. I changed the targeting when trying to get an old aurelia project to work with more modern/node/webpack so tried to version up everything. As many things seem to work when this bug is present it took a good while to do the RCA.

[bigopon]

Thanks @mitchcapper , v2 is not affected by this change. For v1, some work will be required to tackle this, and at the moment, it's not certain yet when that will be, probably until after decorator spec has been finalised.

[mitchcapper]

yeah id assume its not needed to fix in v1 but if its possible to detect and warn of such behavior would be a plus:)