actions

export const listar = lista => {
    console.log('action listar')
    return {  
        type: 'LISTAR',
        lista,
    }
};

componet

import React, { Component } from 'react';
import 'material-components-web/dist/material-components-web.css';
import MeasureListItem from './measure-list-item';
import { connect } from 'react-redux';
import { listar } from './redux/actions';

class MeasureList extends Component {

    componentDidMount() {
        this.props.dispatch({type: 'LISTAR'})
    }

    itemClick(payload) {
      this.props.dispatch({type: 'EDITAR', payload});
    }

    render() {
        this.props.lista = this.props.lista || [];
        const items = this.props.lista.map(
            item => (<MeasureListItem item={item} key= {'aaa'} onClick={this.itemClick.bind(this, item)}/> )
        );

        return (
            <div className="mdc-list mdc-layout-grid__cell">
                <ul>
                    {items}
                </ul>
            </div>
        );
    }
}

const mapStateToProps = (state) => ({lista: state.lista});

const mapDispatchToProps = dispatch => ({
    listar: lista => dispatch(lista => listar(lista))
});

export default  connect(
    mapStateToProps,
    mapDispatchToProps
)(MeasureList);

reducer

import {actionTypes} from './actions';

const defaultItem = {
    key: '',
    datacriacao: new Date().getTime(),
    peso: '',
    altura: '',
    cintura: '',
    abdomen: '',
    quadril: '',
    imc: '',
};

export const lista = (state = [], action) => {
    console.log('reducer listar. action: ', action);
    if(action.type ===  'successfull' ) {
        return action.payload;
    }
    return state;
};

export const item = (state = defaultItem, action) => {
    switch (action.type) {
        case 'EDIT':
            return action.payload;
        case 'UPDATE_IMC':
            return action.payload;
        case 'SAVE':
            return action.payload;
        case 'DELETE':
            return {};
        default:
            return state;
    }
}

sagas

import { listar } from 'modules/measure/redux/actions';

function* listSuccessfull() {
    const measures = yield window.firebase.database().ref("measures/");
    const payload = yield call(fetchList, measures);
    let list = Object.keys(payload).map((k) => ({...payload[k], key: k}));
    yield put(listar(list));
}

const fetchList = (ref) => {
    return new Promise((resolve, reject) => {
        ref.on('value', data => {
            resolve(data.val())
        });
    });
};

function* watchList() {
  yield takeLatest('LISTAR' , listSuccessfull);
};

function* rootSaga() {
  yield fork(watchList);
}

export default rootSaga;