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Kristiyan Kostadinov
a436e2d5ea
Currently the listener side two-way listeners are parsed by appending `=$event` to the raw expression. This is problematic, because: 1. It can interfere with other expressions (see #37809). 2. It can lead to confusing error messages because users will see code that they didn't write. 3. It doesn't allow us to further manipulate the expression. These changes remove the logic that appends `=$event` to resolve the issue. There's also some new logic that checks the expression after it has been parsed to ensure that the result is an assignable expression. Subsequent commits will update the code that emits the expression to add back the `$event` assignment where it's needed. PR Close #54154
Tests in this directory are excluded from running in the browser and only run in node.