[flags] Clean up enableTrustedTypesIntegration

[everettbu]

Mirror of facebook/react#35905
Original author: rickhanlonii

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This is on everywhere so we can reap the code

[greptile-apps]

Greptile Summary

Removed the enableTrustedTypesIntegration feature flag which was enabled everywhere. The cleanup eliminates conditional logic across DOM property operations, form actions, and test files, keeping only the enabled behavior where TrustedType objects are passed directly to DOM APIs without stringification.

Key Changes:

• Removed flag declaration from all ReactFeatureFlags files (7 files)
• Simplified setAttribute and setAttributeNS calls to pass values directly without conditional coercion
• Updated sanitizeURL calls to accept values as-is for href, formAction, and xlink:href attributes
• Removed gate conditions in tests so TrustedType behavior is always expected
• Script tag dev warning now always displays (was conditional on flag)

Impact:
This is a standard feature flag cleanup with no behavioral changes since the flag was already enabled in all environments. The changes reduce code complexity and maintenance burden.

Confidence Score: 5/5

• Safe to merge - standard feature flag cleanup with no behavioral changes
• Flag was already enabled everywhere, changes are mechanical and consistent, grep confirms no remaining references, all test updates align with keeping the enabled behavior
• No files require special attention

Important Files Changed

Filename	Overview
packages/react-dom-bindings/src/client/DOMPropertyOperations.js	Removed flag import and simplified setAttribute calls to pass values directly without conditional stringification
packages/react-dom-bindings/src/client/ReactDOMComponent.js	Removed flag import and simplified sanitizeURL calls across multiple prop types (href, formAction, xlink:href)
packages/react-dom-bindings/src/client/ReactFiberConfigDOM.js	Removed flag import and unconditionally show script tag warning in dev mode
packages/react-dom-bindings/src/events/plugins/FormActionEventPlugin.js	Removed flag import and simplified coerceFormActionProp to pass values directly to sanitizeURL
packages/react-dom/src/client/tests/trustedTypes-test.internal.js	Removed all gate conditions so tests always expect TrustedType objects to pass through without stringification
packages/shared/ReactFeatureFlags.js	Removed enableTrustedTypesIntegration flag declaration

_{Last reviewed commit: 870f08e}

[greptile-apps]

_{16 files reviewed, 1 comment}

_{Edit Code Review Agent Settings | Greptile}

[greptile-apps]

Additional Comments (1)

packages/react-dom/src/__tests__/ReactDOMForm-test.js
Stale comment after flag removal
This comment says "unless trusted types are enabled" but now that enableTrustedTypesIntegration has been removed (always enabled), the qualification no longer applies. Values are now never toString-ed in this path. Consider updating the comment to reflect the new behavior.

    // Everything else is passed through without toString coercion.

Prompt To Fix With AI

This is a comment left during a code review.
Path: packages/react-dom/src/__tests__/ReactDOMForm-test.js
Line: 2331

Comment:
**Stale comment after flag removal**
This comment says "unless trusted types are enabled" but now that `enableTrustedTypesIntegration` has been removed (always enabled), the qualification no longer applies. Values are now never toString-ed in this path. Consider updating the comment to reflect the new behavior.

```suggestion
    // Everything else is passed through without toString coercion.
```

How can I resolve this? If you propose a fix, please make it concise.