Jest Circus is a runner for Jest, a popular JavaScript testing framework. It provides an alternative execution environment and improved error handling compared to the default Jest runner. Jest Circus focuses on clear error messages, enhanced debugging capabilities, and better performance for complex test suites. Its streamlined design simplifies test execution and aids in diagnosing issues, ultimately enhancing developer productivity and contributing to more reliable testing outcomes. It's often used within the Jest ecosystem for advanced testing setups.
Jest-circus releases peaked in 2018 and 2020, with several months having multiple versions. Frequency decreased significantly after 2021, with many months having no releases. Recent activity in 2025 shows a slight resurgence, with releases in June, July, and August after a period of inactivity.
Jest-circus downloads surged from March 2024 (50M) peaking in July 2025 (135M). 2025 saw consistently higher downloads, exceeding 90M each month. August 2025 decreased to 120M. September 2025 downloads are incomplete, showing 53M so far.
