istanbul-utils.js
function addDerivedInfo(coverage) {
    Object.keys(coverage).forEach(function (k) {
      addDerivedInfoForFile(coverage[k]);
    });
  }
function addDerivedInfo(coverage) {
    Object.keys(coverage).forEach(function (k) {
      addDerivedInfoForFile(coverage[k]);
    });
  }
function addDerivedInfo ( coverage ) { Object . keys ( coverage ) . forEach ( function ( k ) { addDerivedInfoForFile ( coverage [ k ] ) ; } ) ; }
adds line coverage information to all file coverage objects.

@method addDerivedInfo
@static
@param {Object} coverage the coverage object
adds line coverage information to all file coverage objects .