Foysal94 Foysal94 - 4 months ago 19
React JSX Question

ES6 modules, babel/webpack. Import/Export statements not working

Ok so am learning react, es6 and webpack/babel. I got my webpack.config set up below:

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const merge = require('webpack-merge');
const validate = require('webpack-validator');
const parts = require('./config/webpack-parts');

const PATHS = {
app: path.join(__dirname, 'app'),
build: path.join(__dirname, 'build')
};

const HTMLWebpackPluginConfig = new HtmlWebpackPlugin({
template: PATHS.app + '/index.html',
filename: 'index.html',
inject: 'body'
});

const common = {
entry: {
app: PATHS.app

},

output: {
path: PATHS.build,
filename: '[name].js'

},

module: {
loaders: [
{
test: /\.jsx?$/,
exclude: /node_modules/,
loader: "babel-loader"
}
]
},

plugins: [HTMLWebpackPluginConfig]

};

var config;

switch(process.env.npm_lifecycle_event) {
case 'build':
config = merge(
common,
{
devtool: 'source-map',
output: {
path: PATHS.build,
filename: '[name].[chunkhash].js',
// This is used for require.ensure. The setup
// will work without but this is useful to set.
chunkFilename: '[chunkhash].js'
}
},
parts.clean(PATHS.build),
parts.extractBundle({
name: 'vendor',
entries: ['react']
}),

parts.minify(),
parts.extractCSS(PATHS.app)
);
break;
default:
config = merge(
common,
parts.setupCSS(PATHS.app),
{
devtool: 'eval-source-map'
},
parts.devServer({
// Customize host/port here if needed
host: process.env.HOST,
port: process.env.PORT
})
);
break;
}

module.exports = validate(config);


The 'config/webpack-parts' file is just some extra modules/plugins and not needed for the question. Was just aiming to make this reusable across projects. I got babel set up also, and the .babelrc file is below

{
"presets": [
"es2015",
"react"
]
}


I have also got all the nesscary babel/webpack plugins installed inside my package.json file:

"devDependencies": {
"babel-core": "^6.11.4",
"babel-loader": "^6.2.4",
"babel-preset-es2015": "^6.9.0",
"babel-preset-react": "^6.11.1",
"clean-webpack-plugin": "^0.1.10",
"css-loader": "^0.23.1",
"extract-text-webpack-plugin": "^1.0.1",
"html-webpack-plugin": "^2.22.0",
"style-loader": "^0.13.1",
"uglify-loader": "^1.3.0",
"webpack": "^1.13.1",
"webpack-dev-server": "^1.14.1",
"webpack-merge": "^0.14.1",
"webpack-validator": "^2.2.7"
},
"dependencies": {
"react": "^15.3.0",
"react-dom": "^15.3.0"
}


So now the problem. I am testing out that this all works and converts es6+react code into es5 using babel etc. I have set up test 'hello.js' and 'world.js' files and I am importing them into my entry/main file 'index.js'. This is where the error is.

hello.js

import React, {Component} from 'react';

export class Hello extends Component {

render() {
return (
<h1>Hello</h1>
)
}
}


world.js

import React, {Component} from 'react';

export class World extends Component {
render() {
return (
<h1>World</h1>
)
}
}


index.js

import React, {Component} from 'react';
import ReactDOM from 'react-dom';
import Hello from 'hello';
import World from 'world';

ReactDOM.render(<Hello/>, document.getElementById('hello'));
ReactDOM.render(<World/>, document.getElementById('world'));


Pre web pack index.html

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Weather App</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
</head>
<body>
<div id="hello"></div>
<div id="world"></div>
</body>
</html>


I am getting the following error on web pack when I run web pack to do its thing.

ERROR in ./app/index.js
Module not found: Error: Cannot resolve module 'hello' in /Users/Foysal/Google Drive/Learning Projects/ReactJS-Tutorial/weather-app/app
@ ./app/index.js 11:13-29


I get a similar error for the 'world.js' file and i have no clue what is wrong with the import/export statements. I am just new to es6 modules but I have exported and imported correctly as far as I am aware. I would appreciate any help, thank you.

Answer

You should use relative path, when you are requiring files, for example:

import React, {Component} from 'react';
import ReactDOM from 'react-dom';
import Hello from '../components/hello';
import World from '../components/world';

In your example, node looking for hello and world modules in node_modules directory.

Comments