title: Redux saga action undefined
body: <p>obviously can post more code but cant work out why my action is returning me undefined here? where should I be passing the data in to this action?</p>
  
  <pre><code>function* fetchInitialData(action) {
    console.log(action, 'acshun'); //IS UNDEFINED HERE
    try {
      const dataFromFirebase = yield call(pullFromFirebase, action.data)
      yield put({ type: "DATA_FETCHED_SUCCESSFULLY", data: dataFromFirebase})
    }
  }
  
  function* mySaga() {
    yield takeLatest("SYNC_FIREBASE_TO_STORE", fetchInitialData)
  }
  </code></pre>
  
  <p>my action:</p>
  
  <pre><code>export const syncFirebaseToStore = (data) =&gt; ({
    type: 'SYNC_FIREBASE_TO_STORE',
    data: data
  })
  </code></pre>