jasmine-core provides the core functionality of the Jasmine Behavior-Driven Development (BDD) testing framework for JavaScript. It includes the essential APIs for defining test suites, individual specs (tests), and matchers for asserting expected outcomes. This package allows developers to write clean, readable, and maintainable tests for their JavaScript code. It's the engine powering Jasmine and is a foundational dependency for any project using Jasmine for testing. Upgrade regularly to benefit from bug fixes and new assertion matchers.