What are some tips for optimizing Jest performance?
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What are some tips for optimizing Jest performance?
To optimize Jest performance, consider using the following tips: 1. Run tests in parallel using the --runInBand option. 2. Use --detectOpenHandles to identify and fix open handles. 3. Limit the number of tests run with --testPathPattern. 4. Use jest --coverage sparingly, as it can slow down tests.
How can I run tests in parallel?
You can run tests in parallel by using the --runInBand option. This allows Jest to run tests in the same process, which can be faster for certain test suites.
What does the --detectOpenHandles option do?
The --detectOpenHandles option helps identify asynchronous operations that are still running after your tests complete, which can lead to performance issues.
Are there any specific configurations I should consider?
Yes, you can configure Jest to use a custom test environment or adjust the testTimeout setting to better suit your project's needs.
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