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[compiler] Only inline SSR state whose setter is no longer read #37865

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mattcarrollcode opened 10:17pm on October 15, 2026 wants to merge 2 commits into facebook/react main from
compiler-ssr-keep-referenced-setters

Pull request #37865 quality checks

Code files and functions touched by this pull request are analyzed below.

Quality targets

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Target name Target value This PR
Maximum Diff Delta per PR 500 0
Maximum comment count per PR 10 0
Pull request maximum business days between activity 3 21
Pull request maximum business days open 5 21

Coupled files

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No file coupling detected. 🎉

Biggest files changes in pull request

Path View whole file Lines removed Lines added Final line count
compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/ssr/ssr-dispatch-passed-to-child.js BeforeAfter 0 0 ---
compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/ssr/ssr-use-reducer-initializer-kept-after-other-state-inlined.js BeforeAfter 0 0 ---
compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/ssr/ssr-render-phase-update-keeps-other-state.js BeforeAfter 0 0 ---
compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/ssr/ssr-render-phase-update-inlines-constant-state.expect.md BeforeAfter 0 0 ---
compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/ssr/ssr-dispatch-passed-to-child.expect.md BeforeAfter 0 0 ---
compiler/crates/react_compiler_optimization/src/dead_code_elimination.rs BeforeAfter 0 0 ---
compiler/crates/react_compiler_optimization/src/optimize_for_ssr.rs BeforeAfter 0 0 ---
compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/ssr/ssr-render-phase-update-keeps-reducer-initializer.expect.md BeforeAfter 0 0 ---
compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/ssr/ssr-render-phase-update-keeps-reducer-initializer.js BeforeAfter 0 0 ---
compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/ssr/ssr-setter-returned-from-custom-hook.expect.md BeforeAfter 0 0 ---
compiler/packages/babel-plugin-react-compiler/docs/passes/05-deadCodeElimination.md BeforeAfter 0 0 ---
compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/ssr/ssr-setter-passed-to-child.expect.md BeforeAfter 0 0 ---
compiler/packages/babel-plugin-react-compiler/docs/passes/35-optimizeForSSR.md BeforeAfter 0 0 ---
compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/ssr/ssr-setter-returned-from-custom-hook.js BeforeAfter 0 0 ---
compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/ssr/ssr-use-reducer-initializer-state-only-read-by-effect.js BeforeAfter 0 0 ---
compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/ssr/ssr-setter-in-context-value.js BeforeAfter 0 0 ---
compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/ssr/ssr-setter-passed-to-child.js BeforeAfter 0 0 ---
compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/ssr/ssr-setter-in-context-value.expect.md BeforeAfter 0 0 ---
compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/ssr/ssr-setstate-during-render.js BeforeAfter 0 0 ---
compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/ssr/ssr-use-reducer-initializer-state-only-read-by-effect.expect.md BeforeAfter 0 0 ---
compiler/packages/babel-plugin-react-compiler/src/Optimization/DeadCodeElimination.ts BeforeAfter 0 0 436
compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/ssr/ssr-inline-state-setter-only-in-removed-props.expect.md BeforeAfter 0 0 ---
compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/ssr/ssr-inline-state-setter-only-in-removed-props.js BeforeAfter 0 0 ---
compiler/packages/babel-plugin-react-compiler/src/Optimization/OptimizeForSSR.ts BeforeAfter 0 0 393
compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/ssr/ssr-render-phase-update-in-custom-hook-keeps-state.js BeforeAfter 0 0 ---
compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/ssr/ssr-use-reducer-initializer-kept-after-other-state-inlined.expect.md BeforeAfter 0 0 ---
compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/ssr/ssr-render-phase-update-inlines-constant-state.js BeforeAfter 0 0 ---
compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/ssr/ssr-render-phase-update-keeps-other-state.expect.md BeforeAfter 0 0 ---
compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/ssr/ssr-render-phase-update-in-custom-hook-keeps-state.expect.md BeforeAfter 0 0 ---
compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/ssr/ssr-setstate-during-render.expect.md BeforeAfter 0 0 ---

️ Biggest functions grown or shrunk by pull request

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