Profiling hooks compatibility

[kentcdodds]

Update performance module tests for React 19 compatibility by replacing injectProfilingHooks with a onCommitFiberRoot fallback.

React 19 removed internals.injectProfilingHooks, causing all performance module tests to fail with a TypeError. This PR introduces a compatibility layer that uses onCommitFiberRoot and fiber PerformedWork data when injectProfilingHooks is unavailable, ensuring tests function correctly on modern React versions while maintaining support for older versions. The counting logic was also refined to prevent overcounting due to memo wrappers.

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Note

Medium Risk
Touches test/profiling infrastructure and relies on React fiber internals/flags, so it may be brittle across React versions and could change which components are counted as “rendered.”

Overview
Improves the render-counting helper used by rerender exercises to work across React versions by conditionally using internals.injectProfilingHooks when available and otherwise falling back to onCommitFiberRoot traversal.

The fallback inspects committed fibers (filtering to user component tags and PerformedWork flag) and derives stable component display names to avoid miscounting with memo/forwardRef wrappers; the same logic is inlined into several memoized.test.ts files and implemented in shared/get-component-calls.tsx, with proper setup/teardown via try/finally.

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Cursor Bugbot has reviewed your changes and found 1 potential issue.

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Bugbot Autofix prepared fixes for 1 of the 1 bugs found in the latest run.

• ✅ Fixed: Fallback path silently drops anonymous components in test files
  • Updated the fallback collection path in all memoized tests to push anonymous components consistently with profiling hooks behavior.