fast-check is a property-based testing framework for JavaScript and TypeScript. It helps you write tests focused on properties that your code should always satisfy, rather than specific examples. By automatically generating a large number of inputs, fast-check increases test coverage and helps uncover edge cases you might miss with traditional unit tests. This leads to more robust and reliable code by exhaustively testing your assumptions. Its seamless integration makes it a valuable tool for any project.
Fast-check's release frequency has varied since its initial release in December 2017. Releases were more frequent in 2018-2021, with peaks in mid-2018 and early 2021. The pace slowed down considerably from 2022 onwards. There haven't been any releases so far in September 2025.
Fast-check's npm package downloads show a generally upward trend from March 2024 (2.3M) to August 2025 (17.4M). There's notable growth in late 2024 and early 2025, with a slight plateau and variations observed in recent months. August 2025 data may not be complete.
