Thanks to maintainers working on projects like istanbul-lib-coverage, you can use Tidelift to give your teams access to a continuously curated stream of validated data about vetted components they need to make intelligent decisions, faster.
You can feel confident bringing istanbul-lib-coverage into your application’s dependency tree because the maintainers of istanbul-lib-coverage are paid by Tidelift to ensure their open source projects follow standardized secure software development practices.
Istanbul instruments your ES5 and ES2015+ JavaScript code with line counters, so that you can track how well your unit-tests exercise your codebase.The nyc command-line-client for Istanbul works well with most JavaScript testing frameworks: tap,mocha, AVA, etc.
You can learn more on the Istanbul JS website.