function onPkgs( error, names ) {
		if ( error ) {
			return clbk( error );
		}
		// TODO: use asynchronous sort function!
		names = sort( names );
		if ( names instanceof Error ) {
			return clbk( names );
		}
		clbk( null, names );
	}
Callback invoked after resolving packages.

@private
@param {(Error|null)} error - error object
@param {(StringArray|EmptyArray)} names - list of package names
@returns {void}