stream-saga/src/js/actions/index.js

import { ADD_ARTICLE } from "../constants/action-types"

export function addArticle(payload) {
  return { type: ADD_ARTICLE, payload }
}

export function getData() {
  return function(dispatch) {
    return fetch("https://jsonplaceholder.typicode.com/posts")
      .then(response => response.json())
      .then(json => {
        dispatch({ type: "DATA_LOADED", payload: json });
      })
  }
}