@jest/core is the heart of the Jest testing framework, providing the foundation for writing, running, and reporting on tests. It handles test discovery, execution, and result aggregation. Key functionalities include the test runner, assertion library integration, and configuration management, allowing developers to easily define test suites and receive comprehensive feedback, enhancing code quality and reliability in JavaScript projects. It offers extensibility through various reporters that are responsible for presenting test result to end developers.
@jest/core releases were frequent in 2019-2022, peaking in April 2020 with 8 versions. The release frequency decreased significantly after 2022. There were no releases between October 2023 and May 2025. The package saw a resurgence in June-September 2025 with several versions released.
@jest/core downloads show a generally increasing trend from March 2024 (76M) to August 2025 (128M), with peaks in June and July 2025 (156M and 153M). September 2025 data is incomplete (26M). Periodic dips occur, notably in December 2024.
