From 66aa87bc58846e49ed88710078856bf415797f47 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rub=C3=A9n=20Norte?= <rubennorte@meta.com>
Date: Mon, 27 Apr 2026 04:26:00 -0700
Subject: [PATCH] Fix toJSON return types in bom.js.flow (#56623)

Summary:

Fix the return types of toJSON() methods in PerformanceEntry, PerformanceServerTiming, and Performance to return an object representation ({[string]: unknown}) instead of a string, per the WebIDL spec ([Default] object toJSON()).

Changelog: [internal]

Differential Revision: D102597516
---
 packages/react-native/flow/bom.js.flow | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/packages/react-native/flow/bom.js.flow b/packages/react-native/flow/bom.js.flow
index f38641c0802..c6855f3df77 100644
--- a/packages/react-native/flow/bom.js.flow
+++ b/packages/react-native/flow/bom.js.flow
@@ -108,7 +108,7 @@ declare class PerformanceEntry {
   entryType: string;
   name: string;
   startTime: DOMHighResTimeStamp;
-  toJSON(): string;
+  toJSON(): {[string]: unknown};
 }
 
 // https://w3c.github.io/user-timing/#performancemark
@@ -127,7 +127,7 @@ declare class PerformanceServerTiming {
   description: string;
   duration: DOMHighResTimeStamp;
   name: string;
-  toJSON(): string;
+  toJSON(): {[string]: unknown};
 }
 
 // https://www.w3.org/TR/resource-timing-2/#sec-performanceresourcetiming
@@ -224,7 +224,7 @@ declare class Performance {
     endMark?: string,
   ): PerformanceMeasure;
   now(): DOMHighResTimeStamp;
-  toJSON(): string;
+  toJSON(): {[string]: unknown};
 }
 
 declare var performance: Performance;