cellxgene/src/reducers/initialize.js

const Initialize = (state = {
  data: null,
  loading: null,
  error: null,
}, action) => {
  switch (action.type) {
  case "initialize started":
    return Object.assign({}, state, {
      loading: true,
      error: null
    });
  case "initialize success":
    return Object.assign({}, state, {
      error: null,
      loading: false,
      data: action.data,
    });
  case "initialize error":
    return Object.assign({}, state, {
      data: null,
      loading: false,
      error: action.data
    });
  default:
    return state;
  }
};

export default Initialize;