diligent-react-native/store/middleware/loadingMiddleware.js

import {
  DELETE,
  ERROR,
  FETCH,
  SUCCESS,
  UPDATE,
  SUBMIT,
} from "../actions/actionHelpers";
import { addLoader, removeLoader } from "../actions/app/appActions";

const promiseTypes = [FETCH, UPDATE, DELETE, SUBMIT];
export default ({ dispatch }) =>
  (next) =>
  (action) => {
    const promiseType = promiseTypes.find((promiseType) =>
      action.type.includes(promiseType)
    );
    if (promiseType) {
      dispatch(addLoader(action.type));
      return next(action);
    }

    if (action.type.includes(SUCCESS) || action.type.includes(ERROR)) {
      dispatch(removeLoader(action.type));
      return next(action);
    }
    next(action);
  };