I'm new to using React and Redux, I'm building a simple todos application. I am writing my application using the create-react-app tool in the command line.
The issue
I went to other blogs and post and others have mentioned that I am missing an npm plugin to transform decorators "transform-decorators-legacy", I added this to my dependencies along with Babel, but I am still receiving the same error.
Syntax error: Unexpected token (9:0)
7 | import './App.css';
8 |
> 9 | @connect((store) => {
| ^
10 | return {
11 | user: store.user.user
12 | }
My code
import React, { Component } from 'react';
import { connect } from 'react-redux';
import Todos from './components/Todos';
import Todo from './components/Todo';
import './App.css';
@connect((store) => {
return {
user: store.user.user
}
})
class App extends Component {
constructor(){
super()
this.state = {
name: 'Brad',
todos: [
{
id: '001',
name: 'Take out trash',
completed: false
},
{
id: '002',
name: 'Meeting with boss',
completed: false
},
{
id: '003',
name: 'Go out to dinner',
completed: false
}
]
}
}
render() {
return (
<div className="App">
<h1>Hello</h1>
<Todos name={this.state.name} todos={this.state.todos}/>
<Todo/>
</div>
);
}
}
export default App;
My dependencies
package.json
{
"name": "react-redux-project",
"version": "0.1.0",
"private": true,
"dependencies": {
"axios": "^0.16.2",
"react": "^15.6.1",
"react-dom": "^15.6.1",
"react-redux": "^5.0.6",
"redux": "^3.7.2",
"redux-logger": "^3.0.6",
"redux-promise-middleware": "^4.3.0",
"redux-thunk": "^2.2.0"
},
"devDependencies": {
"babel": "^6.23.0",
"babel-plugin-transform-decorators-legacy": "^1.3.4",
"react-scripts": "1.0.11"
},
"scripts": {
"start": "react-scripts start",
"build": "react-scripts build",
"test": "react-scripts test --env=jsdom",
"eject": "react-scripts eject"
}
}
Any help/knowledge will be appreciated thanks!
Make sure you don't have a duplicate instance of React on the page. Make sure you don't have multiple instances/copies of React Redux in your project. Make sure you didn't forget to wrap your root or some other ancestor component in <Provider> . Make sure you're running the latest versions of React and React Redux.
mapStateToProps() is a function used to provide the store data to your component. On the other hand, mapDispatchToProps() is used to provide the action creators as props to your component.
The connect() function connects a React component to a Redux store. It provides its connected component with the pieces of the data it needs from the store, and the functions it can use to dispatch actions to the store.
redux state can be accessed as prop in a function by using below format. 1: import { connect } from 'react-redux'; // log accepts logMessage as a prop function log(props) { const { environment, logMessage } = props; console. debug('environment' + environment + logMessage ); .... }
First I'd note that I agree with @markerikson's answer, use the function instead of the decorator.
If you did want to use decorators though, there would be a couple more steps involved. You've added the plugin to your dependencies, but not told Babel to use it.
Create React App uses Webpack with Babel under the hood, namely, in react-scripts. You need to adjust that Babel configuration. The "Create React App" way to do this is to eject from Create React App and then edit .babelrc - see https://babeljs.io/docs/plugins/transform-decorators/#usage-via-babelrc-recommended-
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