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[Ledgers] Scaffold Flight Ledgers behind a flag #37588

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acdlite opened 11:07am on September 11, 2026 wants to merge 82 Δ into facebook/react main from
ledgers/1-flag

Pull request #37588 quality checks

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

Quality targets

How does this pull request compare to chosen code quality targets? Read more about code quality targets.

Target name Target value This PR
Maximum Diff Delta per PR 500 82
Maximum comment count per PR 10 1
Pull request maximum business days between activity 3 5
Pull request maximum business days open 5 6

Coupled files

Are there any files from this commit that are always committed alongside another file? This often suggests that there exists code coupling to potentially remove. Read more about code coupling

Committed together % Code file
Coupled code file 		Commits in PR with both
100 packages/shared/forks/ReactFeatureFlags.native-fb.js
packages/shared/forks/ReactFeatureFlags.native-oss.js 		2
100 packages/shared/forks/ReactFeatureFlags.native-oss.js
packages/shared/ReactFeatureFlags.js 		2
100 packages/shared/forks/ReactFeatureFlags.native-oss.js
packages/shared/forks/ReactFeatureFlags.native-fb.js 		2
100 packages/shared/forks/ReactFeatureFlags.native-oss.js
packages/shared/forks/ReactFeatureFlags.test-renderer.js 		2
100 packages/shared/forks/ReactFeatureFlags.native-oss.js
packages/shared/forks/ReactFeatureFlags.test-renderer.www.js 		2
100 packages/shared/forks/ReactFeatureFlags.native-oss.js
packages/shared/forks/ReactFeatureFlags.www.js 		2
100 packages/shared/forks/ReactFeatureFlags.test-renderer.js
packages/shared/ReactFeatureFlags.js 		2
100 packages/shared/forks/ReactFeatureFlags.test-renderer.js
packages/shared/forks/ReactFeatureFlags.native-fb.js 		2
100 packages/shared/forks/ReactFeatureFlags.test-renderer.js
packages/shared/forks/ReactFeatureFlags.native-oss.js 		2
100 packages/shared/forks/ReactFeatureFlags.test-renderer.js
packages/shared/forks/ReactFeatureFlags.test-renderer.www.js 		2
100 packages/shared/forks/ReactFeatureFlags.test-renderer.js
packages/shared/forks/ReactFeatureFlags.www.js 		2
100 packages/shared/forks/ReactFeatureFlags.test-renderer.www.js
packages/shared/ReactFeatureFlags.js 		2
100 packages/shared/forks/ReactFeatureFlags.test-renderer.www.js
packages/shared/forks/ReactFeatureFlags.native-fb.js 		2
100 packages/shared/forks/ReactFeatureFlags.test-renderer.www.js
packages/shared/forks/ReactFeatureFlags.native-oss.js 		2
100 packages/shared/forks/ReactFeatureFlags.test-renderer.www.js
packages/shared/forks/ReactFeatureFlags.test-renderer.js 		2
100 packages/shared/forks/ReactFeatureFlags.test-renderer.www.js
packages/shared/forks/ReactFeatureFlags.www.js 		2
100 packages/shared/ReactLedgers.js
packages/react/src/ReactLedgers.js 		1
100 packages/react-server/src/ReactFlightLedgers.js
packages/react/src/ReactServer.experimental.js 		1
100 packages/react-server/src/ReactFlightLedgers.js
packages/react/src/ReactLedgers.js 		1
100 packages/react/src/ReactLedgers.js
packages/react-server/src/ReactFlightLedgers.js 		1
100 packages/shared/forks/ReactFeatureFlags.test-renderer.native-fb.js
packages/shared/forks/ReactFeatureFlags.native-fb.js 		2
100 packages/shared/forks/ReactFeatureFlags.test-renderer.native-fb.js
packages/shared/forks/ReactFeatureFlags.native-oss.js 		2
100 packages/react/src/ReactLedgers.js
packages/react/src/ReactServer.experimental.development.js 		2
100 packages/react/src/ReactLedgers.js
packages/react/src/ReactServer.experimental.js 		2
100 packages/react/src/ReactServer.experimental.development.js
packages/react/src/ReactServer.experimental.js 		2
100 packages/react-server/src/ReactFlightLedgers.js
packages/react/src/ReactServer.experimental.development.js 		1
99 packages/shared/forks/ReactFeatureFlags.native-fb.js
packages/shared/forks/ReactFeatureFlags.test-renderer.js 		2
99 packages/shared/forks/ReactFeatureFlags.native-fb.js
packages/shared/forks/ReactFeatureFlags.www.js 		2
99 packages/shared/forks/ReactFeatureFlags.test-renderer.native-fb.js
packages/shared/forks/ReactFeatureFlags.test-renderer.www.js 		2
98 packages/shared/forks/ReactFeatureFlags.test-renderer.native-fb.js
packages/shared/forks/ReactFeatureFlags.test-renderer.js 		2
97 packages/shared/forks/ReactFeatureFlags.test-renderer.native-fb.js
packages/shared/forks/ReactFeatureFlags.www.js 		2
97 packages/shared/forks/ReactFeatureFlags.native-fb.js
packages/shared/forks/ReactFeatureFlags.test-renderer.www.js 		2
97 packages/shared/forks/ReactFeatureFlags.native-fb.js
packages/shared/ReactFeatureFlags.js 		2
95 packages/shared/ReactFeatureFlags.js
packages/shared/forks/ReactFeatureFlags.test-renderer.js 		2
94 packages/shared/forks/ReactFeatureFlags.test-renderer.native-fb.js
packages/shared/ReactFeatureFlags.js 		2
93 packages/shared/ReactFeatureFlags.js
packages/shared/forks/ReactFeatureFlags.www.js 		2
93 packages/shared/ReactFeatureFlags.js
packages/shared/forks/ReactFeatureFlags.native-oss.js 		2
92 packages/shared/ReactFeatureFlags.js
packages/shared/forks/ReactFeatureFlags.native-fb.js 		2
91 packages/shared/forks/ReactFeatureFlags.www.js
packages/shared/forks/ReactFeatureFlags.native-fb.js 		2
90 packages/shared/forks/ReactFeatureFlags.www.js
packages/shared/ReactFeatureFlags.js 		2
90 packages/shared/forks/ReactFeatureFlags.www.js
packages/shared/forks/ReactFeatureFlags.test-renderer.www.js 		2
89 packages/shared/forks/ReactFeatureFlags.www.js
packages/shared/forks/ReactFeatureFlags.native-oss.js 		2
89 packages/shared/ReactFeatureFlags.js
packages/shared/forks/ReactFeatureFlags.test-renderer.www.js 		2
88 packages/shared/forks/ReactFeatureFlags.www.js
packages/shared/forks/ReactFeatureFlags.test-renderer.js 		2
81 packages/react/src/ReactServer.experimental.development.js
packages/react/src/ReactLedgers.js 		2
75 packages/shared/ReactLedgers.js
packages/react/src/ReactServer.experimental.development.js 		1
75 packages/shared/ReactLedgers.js
packages/react/src/ReactServer.experimental.js 		1

Biggest files changes in pull request

Estimated line counts are shown. Values may change once change summary has finished building.

Path View whole file Lines removed Lines added Final line count
packages/react/src/ReactLedgers.js BeforeAfter 0 58 ---
packages/shared/ReactFeatureFlags.js BeforeAfter 0 6 ---
packages/shared/forks/ReactFeatureFlags.test-renderer.native-fb.js BeforeAfter 0 2 ---
packages/react-server/src/ReactFlightLedgers.js BeforeAfter 0 18 ---
packages/shared/ReactLedgers.js BeforeAfter 0 18 ---
packages/react/src/ReactServer.experimental.development.js BeforeAfter 0 5 ---
packages/react/src/ReactServer.experimental.js BeforeAfter 0 5 ---
packages/shared/forks/ReactFeatureFlags.native-oss.js BeforeAfter 0 2 ---
packages/shared/forks/ReactFeatureFlags.native-fb.js BeforeAfter 0 2 ---
packages/shared/forks/ReactFeatureFlags.test-renderer.js BeforeAfter 0 2 ---
packages/shared/forks/ReactFeatureFlags.www.js BeforeAfter 0 2 ---
packages/shared/forks/ReactFeatureFlags.test-renderer.www.js BeforeAfter 0 2 ---

️ Biggest functions grown or shrunk by pull request

Which functions had their line count change as part of this pull request?

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