beforeEachProfiling() — react Function Reference

Architecture documentation for the beforeEachProfiling() function in utils.js from the react codebase.

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BabelCompiler→ Validation→ beforeEachProfiling() — react Function Reference

Dependency Diagram

graph TD
  3f355904_85f9_aa23_9622_d30b71c7e5b9["beforeEachProfiling()"]
  7ea1760e_9c01_71c9_3ba5_32a9a10a0ce4["utils.js"]
  3f355904_85f9_aa23_9622_d30b71c7e5b9 -->|defined in| 7ea1760e_9c01_71c9_3ba5_32a9a10a0ce4
  style 3f355904_85f9_aa23_9622_d30b71c7e5b9 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

packages/react-devtools-shared/src/__tests__/utils.js lines 246–257

export function beforeEachProfiling(): void {
  // Mock React's timing information so that test runs are predictable.
  jest.mock('scheduler', () => jest.requireActual('scheduler/unstable_mock'));

  // DevTools itself uses performance.now() to offset commit times
  // so they appear relative to when profiling was started in the UI.
  jest
    .spyOn(performance, 'now')
    .mockImplementation(
      jest.requireActual('scheduler/unstable_mock').unstable_now,
    );
}