babel-plugin-istanbul instruments your JavaScript code with Istanbul.js code coverage reporters during the Babel compilation process. This allows you to effortlessly measure test coverage without modifying source code. It seamlessly integrates with popular testing frameworks and CI/CD pipelines. Configure thresholds to prevent regressions and generate comprehensive reports in various formats (HTML, LCOV, text, etc.) to gain granular insights into your project's testing effectiveness. Use alongside tools like Jest and Mocha.