bigbuffet-rw/app/soapbox/reducers/lists.ts

import { Map as ImmutableMap } from 'immutable';

import {
  LIST_FETCH_SUCCESS,
  LIST_FETCH_FAIL,
  LISTS_FETCH_SUCCESS,
  LIST_CREATE_SUCCESS,
  LIST_UPDATE_SUCCESS,
  LIST_DELETE_SUCCESS,
} from 'soapbox/actions/lists';
import { normalizeList } from 'soapbox/normalizers';

import type { AnyAction } from 'redux';

type ListRecord = ReturnType<typeof normalizeList>;
type APIEntity = Record<string, any>;
type APIEntities = Array<APIEntity>;

type State = ImmutableMap<string, ListRecord | false>;

const initialState: State = ImmutableMap();

const importList = (state: State, list: APIEntity) => state.set(list.id, normalizeList(list));

const importLists = (state: State, lists: APIEntities) => {
  lists.forEach(list => {
    state = importList(state, list);
  });

  return state;
};

export default function lists(state: State = initialState, action: AnyAction) {
  switch (action.type) {
    case LIST_FETCH_SUCCESS:
    case LIST_CREATE_SUCCESS:
    case LIST_UPDATE_SUCCESS:
      return importList(state, action.list);
    case LISTS_FETCH_SUCCESS:
      return importLists(state, action.lists);
    case LIST_DELETE_SUCCESS:
    case LIST_FETCH_FAIL:
      return state.set(action.id, false);
    default:
      return state;
  }
}