Implementing React Redux - reactjs

I am slowly learning React and also learning to implement it with Redux. But I seem to have hit a road block. So this is what I have so far.
/index.jsx
import './main.css'
import React from 'react'
import ReactDOM from 'react-dom'
import App from './components/App.jsx'
import { Provider } from 'react-redux'
import { createStore } from 'redux'
import ShoppingList from './reducers/reducer'
let store = createStore(ShoppingList)
ReactDOM.render(
<Provider store={store}>
<App />
</Provider>,
document.getElementById('app')
)
/actions/items.js
import uuid from 'node-uuid'
export const CREATE_ITEM = 'CREATE_ITEM'
export function createItem(item) {
return {
type: CREATE_ITEM,
item: {
id: uuid.v4(),
item,
checked: false
}
}
}
/reducers/reducer.js
import * as types from '../actions/items'
import uuid from 'node-uuid'
const initialState = []
const items = (state = initialState, action) => {
switch (action.type) {
case types.CREATE_ITEM:
return {
id: uuid.v4(),
...item
}
default:
return state;
}
}
export default items
/reducers/index.js
UPDATE:
import { combineReducers } from 'redux'
import items from './reducer'
const ShoppingList = combineReducers({
items
})
export default ShoppingList
/components/Item.jsx
import React from 'react';
import uuid from 'node-uuid'
export default class Item extends React.Component {
constructor(props) {
super(props);
this.state = {
isEditing: false
}
}
render() {
if(this.state.isEditing) {
return this.renderEdit();
}
return this.renderItem();
}
renderEdit = () => {
return (
<input type="text"
ref={(event) =>
(event ? event.selectionStart = this.props.text.length : null)
}
autoFocus={true}
defaultValue={this.props.text}
onBlur={this.finishEdit}
onKeyPress={this.checkEnter}
/>
)
};
renderDelete = () => {
return <button onClick={this.props.onDelete}>x</button>;
};
renderItem = () => {
const onDelete = this.props.onDelete;
return (
<div onClick={this.edit}>
<span>{this.props.text}</span>
{onDelete ? this.renderDelete() : null }
</div>
);
};
edit = () => {
this.setState({
isEditing: true
});
};
checkEnter = (e) => {
if(e.key === 'Enter') {
this.finishEdit(e);
}
};
finishEdit = (e) => {
const value = e.target.value;
if(this.props.onEdit) {
this.props.onEdit(value);
this.setState({
isEditing: false
});
}
};
}
/components/Items.jsx
import React from 'react';
import Item from './Item.jsx';
export default ({items, onEdit, onDelete}) => {
return (
<ul>{items.map(item =>
<li key={item.id}>
<Item
text={item.text}
onEdit={onEdit.bind(null, item.id)}
onDelete={onDelete.bind(null, item.id)}
/>
</li>
)}</ul>
);
}
// UPDATE: http://redux.js.org/docs/basics/UsageWithReact.html
// Is this necessary?
const mapStateToProps = (state) => {
return {
state
}
}
Items = connect(
mapStateToPros
)(Items) // `SyntaxError app/components/Items.jsx: "Items" is read-only`
//////////////////////////////////////
// Also tried it this way.
//////////////////////////////////////
Items = connect()(Items)
export default Items // same error as above.
Tried this as well
export default connect(
state => ({
items: store.items
})
)(Items) // `Uncaught TypeError: Cannot read property 'items' of undefined`
UPDATE:
After many attempts #hedgerh in Gitter pointed out that it should be state.items instead. so the solution was
export default connect(
state => ({
items: state.items
})
)(Items)
credits to #azium as well.
/components/App.jsx
export default class App extends React.Component {
render() {
return (
<div>
<button onClick={this.addItem}>+</button>
<Items />
</div>
);
}
}
What am I missing here in order to implement it correctly? Right now it breaks saying that Uncaught TypeError: Cannot read property 'map' of undefined in Items.jsx. I guess it makes sense since it doesn't seem to be hooked up correctly. This is the first part of the app, where the second will allow an user to create a many lists, and these lists having many items. I will probably have to extract the methods from Item.jsx since the List.jsx will do pretty much the same thing. Thanks

You're missing connect. That's how stuff gets from your store to your components. Read the containers section from the docs http://redux.js.org/docs/basics/UsageWithReact.html
import React from 'react'
import Item from './Item.jsx'
import { connect } from 'react-redux'
let Items = ({items, onEdit, onDelete}) => {
return (
<ul>{items.map(item =>
<li key={item.id}>
<Item
text={item.text}
onEdit={onEdit.bind(null, item.id)}
onDelete={onDelete.bind(null, item.id)}
/>
</li>
})
</ul>
)
}
export default connect(
state => ({
items: state.items
})
)(Items)
Also you seem to be expecting onEdit and onDelete functions passed from a parent but you're not doing that so those functions will be undefined.

Related

React-redux no result apears

I'm using React redux to build a div of a number that you can raise or to subtract.
enter image description here
the problem is that everything seems to look good
but there is no result on the browser
reducer-> index.js:
import { combineReducers } from 'redux'
const sumReducer = (sum = 0, action) => {
if (action.type === 'ADD' || action.type === 'SUB') {
let x = action.payload;
return x;
}
return sum;
}
export default combineReducers({
sum: sumReducer
});
**action-> index.js**
export const add = (sum) => {
return {
type: 'ADD',
payload: sum + 1
}
}
export const sub = (sum) => {
return {
type: 'SUB',
payload: sum - 1
}
}
my component is: upDownSum.js
import React from 'react'
import { connect } from 'react-redux'
import { add, sub } from '../action'
class UpDownSum extends React.Component {
render() {
console.log(this.props);
console.log("ghj");
return (
<div key="1">
<button onClick={() => sub(this.props.sum)}>-</button>
<div>{this.props.sum}</div>
<button onClick={() => add(this.props.sum)}>+</button>
</div>
)
}
}
const MapStateToProps = (state) => {
return {
sum: state.sum
}
}
export default connect(MapStateToProps, {add: add ,sub: sub})(UpDownSum);
app.js
import './App.css';
import UpDownSum from './upDownSum'
function App() {
return (
<UpDownSum/>
);
}
export default App;
Thank you!
You are mapping dispatch to props, meaning to dispatch actions you will need to make sure to use props and not just the imported actions:
return (
<div>
<button onClick={() => this.props.sub(this.props.sum)}>-</button>
<div>{this.props.sum}</div>
<button onClick={() => this.props.add(this.props.sum)}>+</button>
</div>
)

How to fix problem with React-Redux(mapDispatchToProps() in Connect() must return a plain object. Instead received undefined.)

I ported my application to redux-thunk and the error started to appear in the console(
mapDispatchToProps() in Connect(UsersContainer) must return a plain object. Instead received undefined.).
But with the appearance of this error, nothing has changed. How to fix it?
Reducer:
import {getTeamApi} from "./api";
let date = {
teamDate: []
};
const realtorsDate = (state = date, action) => {
switch (action.type) {
case "GetTeam":
return {...state, teamDate: [...state.teamDate, ...action.team]};
default:
return state
}
}
export let GetTeam = (team) => ({
type: "GetTeam",
team
})
export default realtorsDate;
export const getTeamThunks = () => {
return (dispatch) => {
getTeamApi.then(response => {
dispatch(GetTeam(response.items));
});
}
}
Container component:
import {connect} from "react-redux";
import {getTeamThunks} from "../../store/realtorsDate";
import ScrollableAnchor from "react-scrollable-anchor";
import MainFourth from "./main-fourth";
import Photo from "../../Images/pivo-3.jpg";
import React from "react";
class UsersContainer extends React.Component {
render() {
return (
<section>
<ScrollableAnchor id={"team"}>
<h2>Наша команда</h2>
</ScrollableAnchor>
<div className="MainFourth">
{this.props.realtorsDate.map((el, i) => (
<MainFourth key={i} el={el} Photo={Photo}></MainFourth>))}
</div>
</section>
);
}
}
let MapStateToProps = (state) => {
return {
realtorsDate: state.realtorsDate.teamDate
}
}
let FourthContainerBlock = connect(MapStateToProps, getTeamThunks)(UsersContainer)
export default FourthContainerBlock
Component:
import React from "react";
import "./../../css/App.css";
import {FontAwesomeIcon} from "#fortawesome/react-fontawesome";
import {faAt, faMobileAlt} from "#fortawesome/free-solid-svg-icons";
class MainFourth extends React.Component {
render() {
return (
<div className="team" key={this.props.i}>
<div className="about-team">
<h2 className="team-name">
{this.props.el.SecondName}
{this.props.el.Name}
</h2>
<h2 className="team-position">{this.props.el.Position}</h2>
<p><FontAwesomeIcon icon={faMobileAlt}></FontAwesomeIcon> : {this.props.el.Phone}</p>
<p><FontAwesomeIcon icon={faAt}></FontAwesomeIcon> : {this.props.el.Mail}</p>
</div>
<img className="TeamsPhoto" src={this.props.Photo} alt="" />
</div>
);
}
}
export default MainFourth;
Ty all
The error is actually pretty straight forward, getTeamThunks should return a js object and that should be synchronous. You can do asynchronous things in the action creators.
The second argument to connect is simply used to map the dispatch to props(the reason why most tend to name it as such).
For example, mapDispatchToProps can look like this:
const mapDispatchToProps = (dispatch) => {
return {
getTeamThunks: () => dispatch(actions.getTeamThunksData())
}
}
let FourthContainerBlock = connect(MapStateToProps, mapDispatchToProps)(UsersContainer)
Now the getTeamthunksData can be written like this:
export const getTeamThunksData = () => {
return (dispatch) => {
getTeamApi.then(response => {
dispatch(GetTeam(response.items));
});
}
}
In your component, you can dispatch it by using this.props.getTeamThunks(). Where you execute it depends on your requirements.

A question about structure of class component in React

As we know, the structure of a class component can be simplified as the following:
// Blank 1
class Books extends Component {
// Blank 2
render(){
// Blank 3
return()
}
export default Books;
So just for example:
import React, { Component } from 'react';
import PropTypes from 'prop-types';
import { connect } from 'react-redux';
import { updateFilters } from '../../../services/filters/actions';
import Checkbox from '../../Checkbox';
import GithubStarButton from '../../github/StarButton';
import './style.scss';
const availableSizes = ['XS', 'S', 'M', 'ML', 'L', 'XL', 'XXL'];
class Filter extends Component {
static propTypes = {
updateFilters: PropTypes.func.isRequired,
filters: PropTypes.array
};
componentWillMount() {
this.selectedCheckboxes = new Set();
}
toggleCheckbox = label => {
if (this.selectedCheckboxes.has(label)) {
this.selectedCheckboxes.delete(label);
} else {
this.selectedCheckboxes.add(label);
}
this.props.updateFilters(Array.from(this.selectedCheckboxes));
};
createCheckbox = label => (
<Checkbox
classes="filters-available-size"
label={label}
handleCheckboxChange={this.toggleCheckbox}
key={label}
/>
);
createCheckboxes = () => availableSizes.map(this.createCheckbox);
render() {
return (
<div className="filters">
<h4 className="title">Sizes:</h4>
{this.createCheckboxes()}
<GithubStarButton />
</div>
);
}
}
const mapStateToProps = state => ({
filters: state.filters.items
});
export default connect(
mapStateToProps,
{ updateFilters }
)(Filter);
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
import React, { Component } from 'react';
import PropTypes from 'prop-types';
import { connect } from 'react-redux';
import { fetchProducts } from '../../services/shelf/actions';
import { addProduct } from '../../services/cart/actions';
import Product from './Product';
import Filter from './Filter';
import ShelfHeader from './ShelfHeader';
import Clearfix from '../Clearfix';
import Spinner from '../Spinner';
import './style.scss';
class Shelf extends Component {
static propTypes = {
fetchProducts: PropTypes.func.isRequired,
products: PropTypes.array.isRequired,
addProduct: PropTypes.func.isRequired,
filters: PropTypes.array,
sort: PropTypes.string
};
state = {
loading: false
};
componentWillMount() {
const { filters, sort } = this.props;
this.handleFetchProducts(filters, sort);
}
componentWillReceiveProps(nextProps) {
const { filters: nextFilters, sort: nextSort } = nextProps;
if (nextFilters !== this.props.filters) {
this.handleFetchProducts(nextFilters, undefined);
}
if (nextSort !== this.props.sort) {
this.handleFetchProducts(undefined, nextSort);
}
}
handleFetchProducts = (
filters = this.props.filters,
sort = this.props.sort
) => {
this.setState({ loading: true });
this.props.fetchProducts(filters, sort, () => {
this.setState({ loading: false });
});
};
render() {
const { products } = this.props;
const p = products.map(p => {
return (
<Product product={p} addProduct={this.props.addProduct} key=
{p.id} />
);
});
return (
<React.Fragment>
{this.state.loading && <Spinner />}
<Filter />
<div className="shelf-container">
<ShelfHeader productsLength={products.length} />
{p}
<Clearfix />
</div>
<Clearfix />
</React.Fragment>
);
}
}
const mapStateToProps = state => ({
products: state.shelf.products,
filters: state.filters.items,
sort: state.sort.type
});
export default connect(
mapStateToProps,
{ fetchProducts, addProduct }
)(Shelf);
Except for state and life cycle methods, sometimes we define other types of attributes and functions in Blank 1, sometimes in Blank 2, sometimes in Blank 3. So I am wondering when we are going to define attributes and functions, which part should we choose? Is there a convention or something like that?
Block 1 is for defining variables and functions which are not depended on component ,these are general variables and functions which could be used in the component and can even be exported in another files.
Block 2 is for defining component specific variables and methods, define lifecycle methods.variables and methods defined in block 2 could be accessed using this keyword.
Block 3 is used when we want to execute certain piece of code,every time when render method is executed.Apart from initial render, render method is executed every time when setState is performed,so avoid writing code in block 3 as it's excessive.
Hope this helps,
Cheers !!

redux state changed but connected component didn't update, can't understand mutation

I know that problem is that there is a mutation. Because mostly there is no rerendering because of it. But, can't understand what's wrong in the way I'm doing this.
For data which I get from backend everything is fine, but if I try to change state from FE it's not working.
The problem is with groupDevicesBySelectedFilter(devicesGroups).
After action is done, I get response that state was changed in console, but as in the title no changings on FE.
Filter.tsx
import * as React from 'react'
import {IAppState} from '../../reducers'
import {connect} from 'react-redux'
import { Dropdown, Header, Icon } from 'semantic-ui-react'
import { INodeTreeFilters, INodeTreeDevicesInfo } from './type-definition';
import * as nodeTreeActions from '../../actions/node-tree';
import * as _ from 'lodash';
interface INodeTreeFilterProps{
filters: INodeTreeFilters;
selectGroupsFilter: any;
groupDevicesBySelectedFilter: typeof nodeTreeActions.groupDevicesBySelectedFilter;
devices: INodeTreeDevicesInfo
}
class NodeTreeFilter extends React.Component<INodeTreeFilterProps>{
public render() {
const {filters, selectGroupsFilter, groupDevicesBySelectedFilter, devices} = this.props;
const groupsFilterSelected = (event: React.SyntheticEvent<HTMLDivElement>, data: any) => {
selectGroupsFilter({id:data.value});
const devicesGroups=_.chain(devices).groupBy(data.value).map((v, i) => {
return {
id: i,
name: i,
devices: v
}
}).value();
groupDevicesBySelectedFilter(devicesGroups);
}
return (
<Header as='h4'>
<Icon name='filter' />
<Header.Content>
Group nodes by {' '}
<Dropdown
inline = {true}
options={filters}
onChange={groupsFilterSelected}
/>
</Header.Content>
</Header>
)
}
}
const mapStateToProps = (state: IAppState) => (
{
filters: state.sidebar.filters,
devices: state.sidebar.devices,
});
const mapDispatchToProps = {
selectGroupsFilter: nodeTreeActions.selectNodeTreeGroupFilter,
groupDevicesBySelectedFilter: nodeTreeActions.groupDevicesBySelectedFilter
};
export default connect(mapStateToProps, mapDispatchToProps)(NodeTreeFilter)
My reducer
export const devicesGroupsReducer = (state: IDevicesGroups = [], action: IActionWithPayload) => {
switch (action.type) {
case nodeTreeActions.GROUP_DEVICES_BY_SELECTED_FILTER:
return action.payload
default:
return state;
} };
export interface IActionWithPayload extends Action {
payload: any;
}
And finally my child component, which should rerendering.
import * as React from 'react'
import {List} from 'semantic-ui-react'
import {IAppState,} from '../../reducers'
import {connect} from 'react-redux'
import {INodeTreeDevicesInfo, INodeTreeDeviceInterfaces, IDevicesGroups} from './type-definition'
import * as nodeTreeActions from '../../actions/node-tree'
// import * as nodeTreeService from '../../services/node-tree'
import {requestError} from "../../actions/error";
interface INodeTreeProps{
devices: INodeTreeDevicesInfo ;
interfaces: INodeTreeDeviceInterfaces;
getDeviceInterfaces: typeof nodeTreeActions.getNodeTreeDeviceInterfaces;
requestError: typeof requestError;
deviceGroups: IDevicesGroups;
}
class NodeTree extends React.Component<INodeTreeProps> {
public generateParentTree = (array: any) => {
const tree = array.map((item:any) => (
<List.Item key={item.id}>
<List.Icon name={ "caret right"} />
<List.Content onClick={this.generateChildren} verticalAlign='middle'>
<List.Description>{item.name}</List.Description>
</List.Content>
</List.Item>
))
return tree
}
public generateChildren = () => {
console.log('I will generate children')
}
public render() {
const {devices, deviceGroups} = this.props;
const parentArray = deviceGroups !== undefined && deviceGroups.length !== 0 ? deviceGroups : devices;
const Tree = this.generateParentTree(parentArray)
console.log('')
return (
<div>
<List>
{Tree}
</List>
</div>
);
}
}
const mapStateToProps = (state: IAppState) => (
{
devices: state.sidebar.devices,
interfaces: state.sidebar.interfaces,
deviceGroups: state.sidebar.deviceGroups
});
const mapDispatchToProps = {
requestError,
getDeviceInterfaces: nodeTreeActions.getNodeTreeDeviceInterfaces
};
export default connect(mapStateToProps, mapDispatchToProps)(NodeTree)
Pls, never mind on public and private states in code
You are mutating your state in the reducer. You need to return a new state object and update it with your payload.
return {
...state,
IDevicesGroups: [...state.IDevicesGroups, action.payload]
}
Should be something like that.

How to reuse reducer with same action using redux-subspace

I'm building a small app using React, semantic-ui-react, redux-subspace.
I have many different tables and when the user clicks on one of the cells, the value supposed to come out on the console but the result is undefined when it clicked. I'm trying to reuse reducer. Same action with different instances.
I appreciate any comments that guide me to right direction.
PartA.js
This component renders Tables and wrapped with <SubspaceProvider>.
<Segment inverted color='black'>
<h1>Age </h1>
{ this.state.toggle ?
<SubspaceProvider mapState={state => state.withSpouseAge} namespace="withSpouseAge">
<TableForm
headers={spouse_ageHeaders}
rows={spouse_ageData}
namespace={'withSpouseAge'}
/>
</SubspaceProvider> :
<SubspaceProvider mapState={state => state.withoutSpouseAge} namespace="withoutSpouseAge">
<TableForm
headers={withoutSpouse_ageHeader}
rows={withoutSpouse_ageData}
namespace={'withoutSpouseAge'}
/>
</SubspaceProvider> }
TableForm.js
This component return Table with the Data and this is where I want to implement onClick method.
import React, { Component } from 'react';
import { connect } from 'react-redux';
import { Table } from 'semantic-ui-react';
import { select } from '../actions';
const shortid = require('shortid');
class TableForm extends Component {
constructor(props){
super(props);
this.state = {
activeIndex: 0,
}
this.handleOnClick = this.handleOnClick.bind(this);
this.isCellActive = this.isCellActive.bind(this);
};
isCellActive(index) {
this.setState({ activeIndex: index });
}
handleOnClick(index, point) {
this.isCellActive(index);
this.props.onSelect(point);
};
tableForm = ({ headers, rows }) => {
const customRenderRow = ({ factor, point, point2 }, index ) => ({
key: shortid.generate(),
cells: [
<Table.Cell content={factor || 'N/A'} />,
<Table.Cell
content={point}
active={index === this.state.activeIndex}
textAlign={'center'}
selectable
onClick={() => this.handleOnClick(index, point)}
/>,
<Table.Cell
content={point2}
textAlign={'center'}
selectable
/>
],
});
return (
<Table
size='large'
padded
striped
celled
verticalAlign={'middle'}
headerRow={this.props.headers}
renderBodyRow={customRenderRow}
tableData={this.props.rows}
/>
)
};
render() {
console.log(this.props.withSpouseAgePoint);
const { headers, rows } = this.props;
return (
<div>
{this.tableForm(headers, rows)}
</div>
);
}
};
const mapDispatchToProps = (dispatch) => {
return {
onSelect: (point) => {dispatch(select(point))},
}
}
const mapStateToProps = state => {
return {
withSpouseAgePoint: state.withSpouseAge,
withSpouseLoePoint: state.withSpouseLoe,
}
}
export default connect(mapStateToProps, mapDispatchToProps)(TableForm);
Action
import {
SELECT,
} from './types';
export const select = (points) => ({
type: 'SELECT',
points,
});
Reducer.js
import { SELECT } from '../actions/types';
const INITIAL_STATE = {
point: 0,
};
const selectionReducer = (state = INITIAL_STATE, action) => {
switch (action.type) {
case 'SELECT':
return { ...state, point: state.point + action.points };
default:
return state;
}
};
export default selectionReducer;
Reducer index.js
import { createStore, combineReducers } from 'redux';
import { subspace, namespaced } from 'redux-subspace';
import selectionReducer from './selectionReducer';
import toggleReducer from './toggleReducer';
const reducers = combineReducers({
withSpouseAge: namespaced('withSpouseAge')(selectionReducer),
withSpouseLoe: namespaced('withSpouseLoe')(selectionReducer),
withSpouseOlp: namespaced('withSpouseOlp')(selectionReducer),
withSpouseOlp2: namespaced('withSpouseOlp2')(selectionReducer),
withSpouseExp: namespaced('withSpouseExp')(selectionReducer),
withoutSpouseAge: namespaced('withoutSpouseAge')(selectionReducer),
withoutSpouseLoe: namespaced('withoutSpouseLoe')(selectionReducer),
withoutSpouseOlp: namespaced('withoutSpouseOlp')(selectionReducer),
withoutSpouseOlp2: namespaced('withoutSpouseOlp2')(selectionReducer),
withoutSpouseExp: namespaced('withoutSpouseExp')(selectionReducer),
toggle: toggleReducer,
});
Update
I added below TableForm component
const mapDispatchToProps = (dispatch) => {
return {
onSelect: (point) => {dispatch(select(point))},
}
}
const mapStateToProps = state => {
return {
withSpouseAgePoint: state.withSpouseAge,
withSpouseLoePoint: state.withSpouseLoe,
}
}
export default connect(mapStateToProps, mapDispatchToProps)(TableForm);
implement this.props.onSelect(point) on handleOnClick. It still shows me the same result undefined. I checked store states by getState(). consloe.log. I think my implementation of redux-subspace is wrong. I uploaded whole TableForm component and also updated reducer. Please help me out!
update 2
I replaced mapStateToProps and it worked like a magic. Thank you again #JustinTRoss.
but there is another problem, all the states are coming out with the same value when I clicked on the cell.
. my plan is each state has their own value stored.
const mapStateToProps = state => {
return {
withSpouseAgePoint: state,
withoutSpouseAge: state,
}
}
You have already namespaced your component to withSpouseAge and mapped state to state.withSpouseAge in your SubspaceProvider. Thus, you're calling the equivalent of state.withSpouseAge.withSpouseAge (undefined).
Another potential issue is the signature with which you are calling connect. From the snippet you provided, there's no way to be sure of the value of 'select'. Typically, connect is called with 2 functions, often named mapStateToProps and mapDispatchToProps. You are calling connect with a function and an object. Here's an example from http://www.sohamkamani.com/blog/2017/03/31/react-redux-connect-explained/#connect :
import {connect} from 'react-redux'
const TodoItem = ({todo, destroyTodo}) => {
return (
<div>
{todo.text}
<span onClick={destroyTodo}> x </span>
</div>
)
}
const mapStateToProps = state => {
return {
todo : state.todos[0]
}
}
const mapDispatchToProps = dispatch => {
return {
destroyTodo : () => dispatch({
type : 'DESTROY_TODO'
})
}
}
export default connect(
mapStateToProps,
mapDispatchToProps
)(TodoItem)
Additionally, there's one other issue, although it isn't affecting you yet: You're calling this.tableForm with 2 arguments (headers and rows), while you defined the this.tableForm function to take a single argument and destructure out 'headers' and 'rows' properties.

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