# fix(react): resolve React 19 / Storybook structuredClone crashes

[Aryan-Verma-999]

fix(react): resolve React 19 / Storybook structuredClone crashes

Acceptance Criteria fulfillment

• Fix structuredClone crashes when interacting with attachments (description updates, file uploads) in Storybook.
• Safely bypass React 19 dev-mode profiler exceptions when diffing deep WebSocket/DDPSDK instances.

Fixes #1300

Video/Screenshots

2026-05-27.23-40-30.mp4

PR Test Details

• Storybook actions auto-wrapping has been turned off via .storybook/preview.js to prevent the actions addon from attempting to serialize non-cloneable objects (like File and Blob) through postMessage.
• Patched global performance.measure to gracefully catch DOMException occurrences thrown by React 19 dev-mode's component render-profiler when crawling deep Context objects.
• All 9 subpackages compile and build flawlessly.

Note: The PR will be ready for live testing at https://rocketchat.github.io/EmbeddedChat/pulls/pr-1310 after approval. Contributors are requested to replace <pr_number> with the actual PR number.