redux-saga-fetch.js

// sagas.js
function* fetchIncrement(){
  return fetch(`http://haha.com/fetch_1`)
  		.then(res=>res.json())
  		.then(data=>{
        console.log(parseInt(data)); // returns string "1" and logs 1 as expected
        return parseInt(data);
  }).catch(err=>console.log(err))
}

export function* incrementAsync(){
  const fetchResult = yield call (fetchIncrement); // fetchResult is a Promise object, not 1
  yield put({type: 'INCREMENT_COUNT', payload: fetchResult}) // fetchResult needs to be 1
}

export function* watchIncrementAsync(){
  yield takeEvery('INCREMENT_ASYNC', incrementAsync);
}