[Compiler Bug]: new mutation aliasing model incorrectly detects a frozen value mutation when mutating a set created via passing the set constructor a frozen value

[deivshon]

What kind of issue is this?

• React Compiler core (the JS output is incorrect, or your app works incorrectly after optimization)
• babel-plugin-react-compiler (build issue installing or using the Babel plugin)
• eslint-plugin-react-compiler (build issue installing or using the eslint plugin)
• react-compiler-healthcheck (build issue installing or using the healthcheck script)

Link to repro

https://playground.react.dev/#N4Igzg9grgTgxgUxALhAgdgQwEYBsEByCA7gLJQAumFAlhOgIK42Zg3oDmpEAJgrsgowoCADrpxNALYAHCDAoACYIqhgEAZSoUEigL6KAZjAhTFokDASY4FC5NnylK8rlob+CW-qMmzFgDoAgHooGmCpKDcadXxbCKjaWK87EHFxBAAPOQVFOHowJQYZGUUAXkUACgBKcoA+ZXFFPIKlAG1k2wQeABpFdQoPOJ0eAF1y1XUtagRK9BJFDyUAHn6hdg5FBprqppb0QsV6IZTugGEAC0xOXQrKgDdMXBFkNZgN2rKG4D3m-IOlPNiCcujwJkDFggKJVOiNduhms0aIYqkCQSMAlcwA8niJqrUfgjEc00Z5QQE+PgdDjngh4cSDPx1I0icTScNugFMDweDS8b99AKBujunMSCKePTBRIiVYKLAEctXO4yUpYd0ysB1TwDMdVecrjdNXqOTxLtcOAgDME6uI9OIQHogA

Repro steps

1. In an event handler, create a Set by passing the Set constructor a frozen value like a piece of state or a prop (i.e. const derivedSet = new Set(frozen))
2. Mutate it by deleting/adding an element

How often does this bug happen?

Every time

What version of React are you using?

19.1

What version of React Compiler are you using?

6c7b1a1

[josephsavona]

Yup that’s a bug. Thanks for posting, I’ll look into it.

[josephsavona]

Fixed in #33584

[josephsavona]

Thanks again for posting, this is fixed on main

[deivshon]

@josephsavona Thank you for fixing this so quickly!

[josephsavona]

Sure thing! It helped that I’d already been working on the larger fix for a while ;-)