nyc
A command-line interface for Istanbul that instruments JavaScript code to collect test coverage metrics.
What is nyc?
nyc is the command-line interface for Istanbul, a JavaScript code coverage tool. It instruments JavaScript code to track which lines, branches, and functions are executed during tests, generating coverage reports to help developers assess test effectiveness. It supports modern JavaScript features, source maps for transpiled code, and integrates with popular test runners.
JavaScript developers and teams using test runners like Mocha, AVA, or Tape who need to measure and improve their test coverage, especially in projects using Babel or TypeScript.
Developers choose nyc for its deep integration with the Istanbul ecosystem, extensive configuration options, support for complex scenarios like subprocesses and source maps, and its ability to work with almost any JavaScript test runner without requiring major workflow changes.
Overview
the Istanbul command line interface
Use Cases
Best For
- Measuring test coverage in Node.js applications
- Tracking coverage for Babel-transpiled JavaScript projects
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