code: function(stream) {
  		var exportKey = function(obj, env) {
  			var keyString = keyStringGenerator(obj, env);
  
  			if(stream.constElements) {
  				if(obj.___jp_originalJsonLine)
  					return keyString + separator + obj.___jp_originalJsonLine;
  			} else {
  				if(obj.___jp_originalJsonLine)
  					delete obj.___jp_originalJsonLine;
  			}
  
  			return keyString + separator + JSON.stringify(obj);
  		};
  
  		return stream.pipe(jp.map(exportKey));
  	}
docs: Если входной поток поделен на объекты
  @param {type} stream
  @returns {unresolved}