Reactjs React native saga产量呼叫不起作用

我正在尝试使用redux saga编写一个api。我的servicesSaga.js是这样的

import { FETCH_USER } from '../actions/actionTypes'
import { delay } from 'redux-saga'
import { call, put, takeEvery, takeLatest } from 'redux-saga/effects'
import { _getUserInformation } from './api'

const getUserInformation = function*(action) {
    console.log("FONKSİYONA geldi")
    console.log(action)
    try {
        console.log("try catche geldi")
        const result = yield call(_getUserInformation, action)
        console.log("result döndü")
        if (result === true) {
            yield put({ type: FETCH_USER })
        }
    } catch (error) {

    }
}

export function* watchGetUserInformation() {
    yield takeLatest(FETCH_USER, getUserInformation)
    console.log("WatchUsere geldi")
}

我正试图从./api调用我的_getUserInformation方法，但yield调用方法不起作用。这是我的api.js

const url = 'http://myreduxproject.herokuapp.com/kayitGetir'


function* _getUserInformation(user) {
    console.log("Apiye geldi" + user)
    const response = yield fetch(url, {
        method: 'POST',
        headers: {
            Accept: 'application/json',
            'Content-Type': 'application/json',
        },
        body: JSON.stringify({
            email: user.email,
        })
    })

    console.log(response.data[0])
    return yield (response.status === 201)
}

export const api ={
    _getUserInformation
}

---

感谢您从现在起提供的帮助。

生成器函数必须定义为function*yourFunction（）{}请尝试以下更改

servicesSaga.js

function* getUserInformation(action) {
    try {
        const result = yield _getUserInformation(action) //pass user here
        if (result) {
            yield put({ type: FETCH_USER })
        }
    } catch (error) {

    }
}

export function* watchGetUserInformation() {
    yield takeLatest(FETCH_USER, getUserInformation)
}

api.js

    const url = 'http://myreduxproject.herokuapp.com/kayitGetir'

    function* _getUserInformation(user) {

        const response = yield fetch(url, {
            method: 'POST',
            headers: {
                Accept: 'application/json',
                'Content-Type': 'application/json',
            },
            body: JSON.stringify({
                email: user.email,
            })
        })
        console.log('response',response);
        return response;
    }

export {
 _getUserInformation
}

---

您是否正在运行reduxSaga（）。在创建店铺后运行（YourSaga）？是的，console.log（“try Catch geldi”）正在运行。在调用“const result=yield call（_getUserInformation，action）”删除catch method时，非常欢迎您。请尝试了解有关生成器函数基础知识的更多信息，这对以后的工作很有帮助。您能为我推荐一个有关生成器函数基础知识的来源吗？