This package provides TypeScript definitions for Sinon-Chai, enabling type checking and enhanced IDE support when using Sinon.js spies, stubs, and mocks with Chai. Sinon-Chai seamlessly integrates Sinon's assertion helpers into Chai's assertion library, making your tests more readable and maintainable. By installing these type definitions, you gain autocompletion, type safety, and improved discoverability for Sinon-Chai's assertion extensions within your TypeScript projects.