code: function instance_mutations () {
          var _parseArguments = parseArguments$2(arguments),
              options = _parseArguments.options,
              mutations = _parseArguments.mutations;
  
          return Object.keys(mutations).reduce(function (instanceMutations, name) {
              instanceMutations[name] = findInstanceThen(options, mutations[name]);
  
              return instanceMutations;
          }, {});
      }
docs: Instance mutations.
  
  @return {Object}