Summary

This PR refactors how React's compiler tracks impure functions (like Date.now()) by changing the 'Impure' effect to signify that the *value* itself is impure, rather than the act of calling it. It enhances data flow analysis to propagate this impurity, but stops propagation when reaching refs, thereby allowing refs to hold impure values.

Changes

Impact Areas

Files Changed

• packages/react-compiler/src/ir/Effect.js
• packages/react-compiler/src/compiler/InferMutationAliasingRanges.js
• packages/react-compiler/src/compiler/Compile.js