How to change the format of the LCOV report executed by Karma?

You could run a script that does: cat lcov.info | egrep "^(SF|DA|BRDA):" > lcov.info.new; mv lcov.info.new lcov.info.

With that I get:

SF:./app/scripts/app.js
DA:2,1
DA:20,1
DA:29,0
DA:34,0