This package was created a long time ago before istanbul had direct transpiler support. I suggest looking at https://istanbul.js.org/ for an updated and maintained solution for code coverage.

• Features
• Getting started

• This package handles coverage for babel generated code by reconciling babel's output and its source map.
• babel-istanbul is drop-in replacement for istanbul, as it is a fork of istanbul with babel compilation inserted into the instrumentation layer.

$ npm install babel-istanbul

• babel-istanbul is run exactly like istanbul. For specifics on running istanbul, see istanbul's README.