Redux Saga实现loading中间件

import { call, put } from 'redux-saga/effects';
import * as is from '@redux-saga/is';


const LOADING_BLACKLIST = [UserActionTypes.GET_USERS];

function isForkEffect(eff) {
  return is.effect(eff) && eff.type === 'FORK';
}

function loading(sagaFn) {
  return function* (action) {
    function* loadingWrapper() {
      yield put(loadingStatusAction(true));
      yield call(sagaFn, action);
      yield put(loadingStatusAction(false));
    }

    if (LOADING_BLACKLIST.includes(action.type)) {
      return yield call(sagaFn, action);
    } else {
      // @ts-ignore
      return yield call(loadingWrapper, action);
    }
  };
}

const effectMiddleware = next => eff => {
  if (isForkEffect(eff)) {
    eff.payload.args[1] = safe(eff.payload.args[1]);
    eff.payload.args[1] = loading(eff.payload.args[1]); // loading
  }
  return next(eff);
};

export const sagaMiddleware = createSagaMiddleware({
  effectMiddlewares: [effectMiddleware],
  onError: sagaEffectUnhandled
});