Determining the extent of test coverage of javascript code?

Question

JavaScript

There is a project on JavaScript + Node.JS + Ant.
Tests for JavaScript code are written in Karma + Jasmine.
Can you please tell me a decent library for determining the degree of code coverage by tests?
UPD:
You can use istanbul to evaluate code coverage with tests .
Nevertheless, if someone else knows the libraries, I will be glad to hear the information.

Answer 1

Blanket
JSCover
Saga

Answer 2

karma-coverage