Also see mocha-blanket.
Install
npm install --save-dev jscoverage
Ignore output
echo coverage.html >> .gitignore
package.json
The coverage task injects your source files (lib) with jscoverage hooks, runs mocha -R html-cov, then restores later.
/* directory */
"coverage": "mv lib lib~; (jscoverage lib~ lib; mocha -R html-cov > coverage.html); rm -rf lib; mv lib~ lib"
/* single file */
"coverage": "(cp index.js index.js~; jscoverage index.js; mv index-cov.js index.js; mocha -R html-cov > coverage.html); mv index.js~ index.js"
Run
npm run coverage
open coverage.html
Caveats
If you’re using jsdom, be sure to expose the window._$jscoverage variable into
the global scope.