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Add feature flag to enable experimental MutationObserver (#55919) (0.85)#56600

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rubennorte wants to merge 1 commit intofacebook:0.85-stablefrom
rubennorte:pick-mutationobserver-featureflag-85
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Add feature flag to enable experimental MutationObserver (#55919) (0.85)#56600
rubennorte wants to merge 1 commit intofacebook:0.85-stablefrom
rubennorte:pick-mutationobserver-featureflag-85

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Changelog: [internal]

Summary:

This picks #55919 into 0.85-stable, as we'll be testing this feature in apps using 0.85.

Changelog:

Not needed. It's gated behind a feature flag that's disabled by default.

Test Plan:

Tested e2e on Android and iOS using RN Tester. Everything compiles correctly.

@rubennorte rubennorte requested a review from huntie April 24, 2026 14:39
@meta-cla meta-cla Bot added the CLA Signed This label is managed by the Facebook bot. Authors need to sign the CLA before a PR can be reviewed. label Apr 24, 2026
@rubennorte rubennorte marked this pull request as ready for review April 24, 2026 14:40
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Warning

JavaScript API change detected

This PR commits an update to ReactNativeApi.d.ts, indicating a change to React Native's public JavaScript API.

  • Please include a clear changelog message.
  • This change will be subject to additional review.

This change was flagged as: POTENTIALLY_BREAKING

)

Summary:
Pull Request resolved: facebook#55919

Changelog: [internal]

Adds a new feature flag to enable the experimental and partial implementation of `MutationObserver`

Reviewed By: Abbondanzo, sammy-SC, javache

Differential Revision: D95223862

fbshipit-source-id: e19dd163e5f7fecd9ef28b79be61455f0993a3c4
@rubennorte rubennorte force-pushed the pick-mutationobserver-featureflag-85 branch from fa785a1 to 8e435fb Compare April 24, 2026 17:43
@rubennorte rubennorte changed the title Add feature flag to enable experimental MutationObserver (#55919) Add feature flag to enable experimental MutationObserver (#55919) (0.85) Apr 27, 2026
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