chore(chat): Update React to v19.2.1

[ccastrotrejo]

Commit Type

• feature - New functionality
• fix - Bug fix
• refactor - Code restructuring without behavior change
• perf - Performance improvement
• docs - Documentation update
• test - Test-related changes
• chore - Maintenance/tooling

Risk Level

• Low - Minor changes, limited scope
• Medium - Moderate changes, some user impact
• High - Major changes, significant user/system impact

What & Why

Updates React and React DOM from v19.2.0 to v19.2.1 in the iframe-app and a2a-core packages to incorporate the latest bug fixes and improvements from the React team.

Impact of Change

• Users: No user-facing changes expected. This is a patch version update that includes bug fixes.
• Developers: Dependencies updated to latest React 19 patch version. The peer dependency requirement in a2a-core is also updated to match.
• System: Minimal impact - patch version update includes bug fixes and stability improvements.

Test Plan

• Unit tests added/updated
• E2E tests added/updated
• Manual testing completed
• Tested in: Local development environment

Contributors

@ccastrotrejo

Screenshots/Videos

N/A - Dependency update only

[github-actions]

🤖 AI PR Validation Report

PR Review Results

Thank you for your submission! Here's detailed feedback on your PR title and body compliance:

✅ PR Title

• Current: chore(chat): Update React to v19.2.1
• Issue: Title is clear and follows conventional commit format for a dependency update.
• Recommendation: No change needed. Title specifies scope (chat) and outcome.

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✅ Commit Type

• Properly selected (chore)
• Only one option selected, which matches the described change.

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✅ Risk Level

• Correctly marked as Low risk in both label and body, matches patch dependency update.

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✅ What & Why

• Current: Updates React and React DOM from v19.2.0 to v19.2.1 in the iframe-app and a2a-core packages to incorporate the latest bug fixes and improvements from the React team.
• Issue: None, context is succinct and clear.
• Recommendation: N/A

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✅ Impact of Change

• Well described for users, developers, and system.
• Recommendation: N/A - All sections covered adequately.
  • Users: No user-facing changes expected.
  • Developers: Dependencies updated to latest React 19 patch version.
  • System: Minimal impact - patch version update includes bug fixes and stability improvements.

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✅ Test Plan

• Manual testing and local validation completed, which is sufficient for this change type.

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⚠️ Contributors

• Only self-tagged. Optional for direct change, but could be enhanced by crediting designers/PMs if relevant.

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✅ Screenshots/Videos

• Not applicable for dependency update (N/A), no indication of visual changes.

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Summary Table

Section	Status	Recommendation
Title	✅
Commit Type	✅
Risk Level	✅
What & Why	✅
Impact of Change	✅
Test Plan	✅
Contributors	⚠️	Tag others for credit if appropriate
Screenshots/Videos	✅

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PR passes. No required changes for compliance. Consider always tagging any contributing teammates, designers or PMs for greater transparency, but this is not required. Thank you for maintaining a high-quality PR submission!

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Last updated: Fri, 05 Dec 2025 23:10:50 GMT

[Copilot]

Pull request overview

This PR updates React and React-DOM from version ^19.2.0 to ^19.2.1 in two packages within the monorepo: libs/a2a-core (@microsoft/logic-apps-chat SDK) and apps/iframe-app (the embeddable chat widget). The a2a-core library is a standalone React SDK designed specifically for React 19+, and the iframe-app is its primary consumer within this monorepo.

Key Changes:

• Bump React and React-DOM dev dependencies from ^19.2.0 to ^19.2.1 in libs/a2a-core
• Update peer dependency constraint from >=19.2.0 to >=19.2.1 in libs/a2a-core
• Bump React and React-DOM dependencies from ^19.2.0 to ^19.2.1 in apps/iframe-app

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
libs/a2a-core/package.json	Updates React devDependencies to 19.2.1 and tightens peerDependency to >=19.2.1 for the chat SDK library
apps/iframe-app/package.json	Updates React dependencies to 19.2.1 to align with the a2a-core SDK it consumes