I am trying to use Webpack with Babel to compile ES6 assets, but I am getting the following error message:
You may need an appropriate loader to handle this file type.
| import React from 'react';
| /*
| import { render } from 'react-dom'
Here is what my Webpack config looks like:
var path = require('path');
var webpack = require('webpack');
module.exports = {
entry: './index',
output: {
path: path.join(__dirname, 'dist'),
filename: 'bundle.js',
publicPath: '/dist/'
},
module: {
loaders: [
{
test: /\.jsx?$/,
loader: 'babel-loader',
exclude: /node_modules/
}
]
}
}
Here is the middleware step that makes use of Webpack:
var webpack = require('webpack');
var webpackDevMiddleware = require('webpack-dev-middleware');
var config = require('./webpack.config');
var express = require('express');
var app = express();
var port = 3000;
var compiler = webpack(config);
app.use(webpackDevMiddleware(compiler, {
noInfo: true,
publicPath: config.output.publicPath
}));
app.get('/', function(req, res) {
res.sendFile(__dirname + '/index.html');
});
app.listen(port, function(err) {
console.log('Server started on http://localhost:%s', port);
});
All my index.js file is doing is importing react, but it seems like the 'babel-loader' is not working.
I am using 'babel-loader' 6.0.0.
This question is related to
javascript
webpack
babeljs
es6-module-loader
If you are using Webpack > 3 then you only need to install babel-preset-env
, since this preset accounts for es2015, es2016 and es2017.
var path = require('path');
let webpack = require("webpack");
module.exports = {
entry: {
app: './app/App.js',
vendor: ["react","react-dom"]
},
output: {
filename: 'bundle.js',
path: path.resolve(__dirname, '../public')
},
module: {
rules: [{
test: /\.jsx?$/,
exclude: /node_modules/,
use: {
loader: 'babel-loader?cacheDirectory=true',
}
}]
}
};
This picks up its configuration from my .babelrc
file:
{
"presets": [
[
"env",
{
"targets": {
"browsers":["last 2 versions"],
"node":"current"
}
}
],["react"]
]
}
When using Typescript:
In my case I used the newer syntax of webpack v3.11 from their documentation page I just copied the css and style loaders configuration form their website. The commented out code (newer API) causes this error, see below.
module: {
loaders: [{
test: /\.ts$/,
loaders: ['ts-loader']
},
{
test: /\.css$/,
loaders: [
'style-loader',
'css-loader'
]
}
]
// ,
// rules: [{
// test: /\.css$/,
// use: [
// 'style-loader',
// 'css-loader'
// ]
// }]
}
The right way is to put this:
{
test: /\.css$/,
loaders: [
'style-loader',
'css-loader'
]
}
in the array of the loaders property.
BABEL TEAM UPDATE:
We're super excited that you're trying to use ES2015 syntax, but instead of continuing yearly presets, the team recommends using babel-preset-env. By default, it has the same behavior as previous presets to compile ES2015+ to ES5
If you are using Babel version 7 you will need to run npm install @babel/preset-env and have "presets": ["@babel/preset-env"] in your .babelrc
configuration.
This will compile all latest features to es5 transpiled code:
Prerequisites:
Step-1:: npm install --save-dev @babel/preset-env
Step-2: In order to compile JSX
code to es5 babel provides @babel/preset-react
package to convert reactjsx
extension file to native browser understandable code.
Step-3: npm install --save-dev @babel/preset-react
Step-4: create .babelrc
file inside root path path of your project where webpack.config.js
exists.
{
"presets": ["@babel/preset-env", "@babel/preset-react"]
}
Step-5: webpack.config.js
const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
module.exports = {
mode: 'development',
entry: path.resolve(__dirname, 'src/index.js'),
output: {
path: path.resolve(__dirname, 'output'),
filename: 'bundle.js'
},
resolve: {
extensions: ['.js', '.jsx']
},
module: {
rules: [{
test: /\.(js|jsx)$/,
exclude: /node_modules/,
use: {
loader: 'babel-loader'
}
},
{
test: /\.css$/i,
use: ['style-loader', 'css-loader'],
}
]
},
plugins: [
new HtmlWebpackPlugin({
template: "./public/index.html",
filename: "./index.html"
})
]
}
In my case, I had such error since import path was wrong:
Wrong:
import Select from "react-select/src/Select"; // it was auto-generated by IDE ;)
Correct:
import Select from "react-select";
Due to updates and changes overtime, version compatibility start causing issues with configuration.
Your webpack.config.js should be like this you can also configure how ever you dim fit.
var path = require('path');
var webpack = require("webpack");
module.exports = {
entry: './src/js/app.js',
devtool: 'source-map',
mode: 'development',
module: {
rules: [{
test: /\.js$/,
exclude: /node_modules/,
use: ["babel-loader"]
},{
test: /\.css$/,
use: ['style-loader', 'css-loader']
}]
},
output: {
path: path.resolve(__dirname, './src/vendor'),
filename: 'bundle.min.js'
}
};
Another Thing to notice it's the change of args, you should read babel documentation https://babeljs.io/docs/en/presets
.babelrc
{
"presets": ["@babel/preset-env", "@babel/preset-react"]
}
NB: you have to make sure you have the above @babel/preset-env & @babel/preset-react installed in your package.json dependencies
This one throw me for a spin. Angular 7, Webpack I found this article so I want to give credit to the Article https://www.edc4it.com/blog/web/helloworld-angular2.html
What the solution is: //on your component file. use template as webpack will treat it as text template: require('./process.component.html')
for karma to interpret it npm install add html-loader --save-dev { test: /.html$/, use: "html-loader" },
Hope this helps somebody
Make sure you have the es2015 babel preset installed.
An example package.json devDependencies is:
"devDependencies": {
"babel-core": "^6.0.20",
"babel-loader": "^6.0.1",
"babel-preset-es2015": "^6.0.15",
"babel-preset-react": "^6.0.15",
"babel-preset-stage-0": "^6.0.15",
"webpack": "^1.9.6",
"webpack-dev-middleware": "^1.2.0",
"webpack-hot-middleware": "^2.0.0"
},
Now configure babel-loader in your webpack config:
{ test: /\.js$/, loader: 'babel-loader', exclude: /node_modules/ }
add a .babelrc file to the root of your project where the node modules are:
{
"presets": ["es2015", "stage-0", "react"]
}
More info:
Source: Stackoverflow.com