expect-type is a TypeScript utility for precise type assertions in your tests. It allows developers to write tests that check the *exact* type, ensuring code fulfills its type contract. Unlike runtime checks, expect-type operates at compile-time, preventing incorrect types from ever reaching the execution stage. It offers functions to assert assignability, equality, and more, greatly improving the robustness and reliability of TypeScript code by catching type errors early in the development process.
The expect-type package had frequent releases in 2020, with a peak in March. Release frequency significantly decreased from 2021 to 2023, with occasional releases. In 2024, releases were sparse until October, which saw versions 1.0.0 and 1.1.0; as of September 2025, releases have been similarly scattered with versions 1.2.0 1.2.1 and 1.2.2, denoting a slowdown in activity.
Expect-type's npm downloads show consistent growth from March to August 2024, followed by an explosion starting in November 2024. Downloads peaked in August 2025 at over 43 million. September 2025 shows a significant drop, but it's an incomplete month. Overall, the package exhibits strong upward trending popularity.
