esmock is essential for robust unit testing in JavaScript. It offers simplified mocking of ES modules, enabling developers to isolate and test individual components effectively. Beyond simple module stubs, esmock dynamically mocks modules within your tests, supporting named, default, and namespace exports. It's lightweight, fast, and helps write focused tests by removing dependencies, fostering predictable and reliable execution.
Esmock's release frequency peaked in 2021 and 2022, with consistent updates. There were fewer releases in 2023 and 2024. In 2025, releases have been sparse, with one in January, one in July and two versions released in September to date.
esbuild-mock, an npm package, experienced fluctuating downloads. From March 2024 to August 2025, downloads generally increased, peaking in June 2025 at 251,633. However, July and August saw declines, and September 2025 (partial month) shows a significant drop, suggesting a potential shift in usage.
