babel-plugin-istanbul

Babel plugin that instruments JavaScript code with Istanbul coverage. Version 8.0.0 (stable) requires Node >=18 and Babel 7/8. It automatically detects test files via nyc's exclude/include patterns and respects inline source maps. Unlike manual instrumentation, this plugin integrates seamlessly with existing Babel pipelines and tools like karma-coverage and nyc. Released as part of the istanbuljs project with regular updates and LTS support. Key differentiator: zero-config setup with nyc and Karma, and no need for separate coverage preprocessor.