[Snyk] Security upgrade react-scripts from 1.1.5 to 4.0.0

[saurabharch]

Snyk has created this PR to fix 1 vulnerabilities in the yarn dependencies of this project.

Snyk changed the following file(s):

• fixtures/concurrent/time-slicing/package.json
• fixtures/concurrent/time-slicing/yarn.lock

Note for zero-installs users

If you are using the Yarn feature zero-installs that was introduced in Yarn V2, note that this PR does not update the .yarn/cache/ directory meaning this code cannot be pulled and immediately developed on as one would expect for a zero-install project - you will need to run yarn to update the contents of the ./yarn/cache directory.
If you are not using zero-install you can ignore this as your flow should likely be unchanged.

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Predictable Value Range from Previous Values SNYK-JS-FORMDATA-10841150	863

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Important

• Check the changes in this PR to ensure they won't cause issues with your project.
• Max score is 1000. Note that the real score may have changed since the PR was raised.
• This PR was automatically created by Snyk using the credentials of a real user.

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[gemini-code-assist]

Summary of Changes

Hello @saurabharch, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request is an automated security fix initiated by Snyk. Its primary purpose is to mitigate a known vulnerability by upgrading a core development dependency, react-scripts, to a more secure version. This ensures the project's dependencies are up-to-date and less susceptible to security risks.

Highlights

• Security Upgrade: This pull request automatically upgrades the react-scripts dependency from version ^1.1.4 to ^4.0.0 to address a critical security vulnerability (SNYK-JS-FORMDATA-10841150) related to 'Predictable Value Range from Previous Values'.
• Dependency Management: The package.json file in fixtures/concurrent/time-slicing/ has been updated to reflect the new react-scripts version, and the corresponding yarn.lock file has been updated to ensure dependency consistency.

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[gemini-code-assist]

Code Review

This pull request, automatically generated by Snyk, aims to fix a security vulnerability by upgrading react-scripts from version 1.1.5 to 4.0.0. While addressing security is important, this is a major version upgrade that introduces significant breaking changes. My review highlights a critical compatibility issue with the experimental React version used in this fixture, which will likely cause the build to fail. I've recommended a more targeted approach to fix the vulnerability to avoid breaking this test fixture.

[gemini-code-assist]

This major version upgrade of react-scripts from v1 to v4 introduces significant breaking changes and is highly likely to break this fixture.

• Peer Dependency Conflict: [email protected] has a peer dependency on react@>=16.8.0. The experimental version 0.0.0-experimental-269dd6ec5 used in this fixture does not satisfy this requirement, which will likely cause dependency installation to fail.
• Breaking API/Tooling Changes: The jump from v1 to v4 involves major upgrades to underlying tools like Babel and Webpack. The fixture's code, which relies on experimental React features, may not be compatible with the new build configuration without a significant migration effort.

Given this is an automated security upgrade, a less disruptive fix should be considered, such as using Yarn's resolutions to update the specific vulnerable transitive dependency. If react-scripts must be upgraded, it will require a manual migration of this fixture.