text: import * as types from './mutation_types';
  import createState from './state';
  
  export default (transformFunc) => ({
    [types.SET_ENDPOINT](state, endpoint) {
      state.statisticsEndpoint = endpoint;
    },
    [types.REQUEST_STATISTICS](state, timeRange) {
      state.isLoadingStatistics = true;
      state.errorLoadingStatistics = false;
      state.timeRange = timeRange;
    },
    [types.RECEIVE_STATISTICS_SUCCESS](state, payload) {
      const stats = payload ? transformFunc(payload) : createState().statistics;
      state.statistics = stats;
      state.isLoadingStatistics = false;
      state.errorLoadingStatistics = false;
    },
    [types.RECEIVE_STATISTICS_ERROR](state) {
      state.isLoadingStatistics = false;
      state.errorLoadingStatistics = true;
    },
  });
  