Add a visitor that checks for invalid JS interop usage and reports
diagnostics. Wire the visitor up to the `DevCompilerTarget` and `Dart2jsTarget`.
- Add a message without an analyzer code for this error. In the long term we may
want to also add it to analyzer.
- Add a new package `_js_interop_checks` to share the kernel visitor between
dart2js and ddc. Some of the code is copied from ddc, and in the long term we
can centralize more of the detection of JS interop annotations to this
package.
- Implement the first check to detect definitions of `operator []` or
`operator []=` which are not allowed in JS interop classes.
Change-Id: I095a4b7f4732796dbc3cae55b32d5fc9bcdbd798
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/130733
Commit-Queue: Nate Bosch <nbosch@google.com>
Reviewed-by: Sigmund Cherem <sigmund@google.com>
Devon Carew