mannuk mannuk - 2 months ago 41
Node.js Question

fetch method is not defined using ES6 fetch in React

hey guys I have a trouble with fetch functions in my first react js app.

This is the structure of my project:

hello-world
-- app
-- components
-- main.jsx
-- node_modules
-- public
-- build.js
-- index.html
-- package.json


This is what I've installed using npm:

npm install react react-dom babel-core babel-loader babel-preset-es2015 babel-preset-react webpack --save-dev
npm install --save isomorphic-fetch es6-promise


I use webpack
webpack.config

module.exports = {
entry: './app/components/main.jsx',
output: {
path: './public/',
filename: "build.js",
},
module: {
loaders: [
{
exclude: /(node_modules|bower_components)/,
loader: 'babel',
query: {
presets: ['es2015', 'react']
}
}
]
}
};


package.json

{
"name": "hello-world",
"version": "1.0.0",
"description": "",
"main": "webpack.config.js",
"scripts": {
"build": "webpack -w"
},
"author": "mannuk",
"license": "MIT",
"devDependencies": {
"babel-core": "^6.14.0",
"babel-loader": "^6.2.5",
"babel-preset-es2015": "^6.14.0",
"babel-preset-react": "^6.11.1",
"react": "^0.14.8",
"react-dom": "^0.14.8",
"webpack": "^1.13.2"
},
"dependencies": {
"es6-promise": "^3.3.1",
"isomorphic-fetch": "^2.2.1"
}
}


This is the file where I build the UI:

main.jsx

import React from 'react';
import ReactDOM from 'react-dom';
import 'isomorphic-fetch';
import 'es6-promise';

class Person extends React.Component {

constructor(props){
super(props);
this.state = {people : []};
}

componentWillMount(){
fetch('xxx/people',
method: 'get',
headers: {'token' : 'xxx'}
)
.then((response) => {
return response.json()
})
.then((people) => {
this.setState({ people: people })
})
}

render(){
return <div>
<input type="text" value={this.state.people[0].name}></input>
</div>
}
}

ReactDOM.render(
<Person/>,
document.getElementById('container')
);


If I try to run it through the browser it fails (fetch method is not defined) I have also checked this releated post ES6 `fetch is undefined` and I have included the import with no success. I also included es6-promise import but it fails too.

What am I doing wrong? Is it a config problem or what? When I run 'npm run build' there is no error and the build.js seems to be ok.

Answer

It's an exported default, so...

import fetch from 'isomorphic-fetch'
Comments