eslint-plugin-mocha brings linting rules specific to Mocha testing framework to your JavaScript code. It helps enforce best practices for writing clear and maintainable Mocha tests, catching common errors like incorrect use of done callbacks, missing assertions, and duplicated titles. By integrating with ESLint, it promotes consistent testing style and improves the overall quality and reliability of your test suite. It flags potential issues early in the development process, streamlining debugging and enhancing code maintainability.