in packages/docpack/lib/docpack.js [79:86]
Docpack.prototype.save = function(source) {
var sources = this.sources;
var alreadyExist = sources.filter(function(item) { return item.path === source.path })[0];
alreadyExist
? sources[sources.indexOf(alreadyExist)] = source
: sources.push(source);
};