Sanket Meghani Sanket Meghani - 3 months ago 119
React JSX Question

Webpack - Babel - Parsing JSX: SyntaxError: Unexpected token

I am trying to create a React application using webpack. I am using babel to transpile .jsx files. But it seems, it is not using babel loader to load .jsx file. I am receiving following error:

ERROR in ./app.jsx
Module parse failed: C:\codebase\react-demo/app\app.jsx Unexpected token (7:15)
You may need an appropriate loader to handle this file type.
SyntaxError: Unexpected token (7:15)
at Parser.pp$4.raise (C:\codebase\react-demo\node_modules\acorn\dist\acorn.js:2221:15)
at Parser.pp.unexpected (C:\codebase\react-demo\node_modules\acorn\dist\acorn.js:603:10)
at Parser.pp$3.parseExprAtom (C:\codebase\react-demo\node_modules\acorn\dist\acorn.js:1822:12)
at Parser.pp$3.parseExprSubscripts (C:\codebase\react-demo\node_modules\acorn\dist\acorn.js:1715:21)
at Parser.pp$3.parseMaybeUnary (C:\codebase\react-demo\node_modules\acorn\dist\acorn.js:1692:19)
at Parser.pp$3.parseExprOps (C:\codebase\react-demo\node_modules\acorn\dist\acorn.js:1637:21)
at Parser.pp$3.parseMaybeConditional (C:\codebase\react-demo\node_modules\acorn\dist\acorn.js:1620:21)
at Parser.pp$3.parseMaybeAssign (C:\codebase\react-demo\node_modules\acorn\dist\acorn.js:1597:21)
at Parser.pp$3.parseExpression (C:\codebase\react-demo\node_modules\acorn\dist\acorn.js:1573:21)
at Parser.pp$1.parseReturnStatement (C:\codebase\react-demo\node_modules\acorn\dist\acorn.js:839:33)
at Parser.pp$1.parseStatement (C:\codebase\react-demo\node_modules\acorn\dist\acorn.js:699:34)
at Parser.pp$1.parseBlock (C:\codebase\react-demo\node_modules\acorn\dist\acorn.js:981:25)
at Parser.pp$3.parseFunctionBody (C:\codebase\react-demo\node_modules\acorn\dist\acorn.js:2105:24)
at Parser.pp$3.parseMethod (C:\codebase\react-demo\node_modules\acorn\dist\acorn.js:2075:10)
at Parser.pp$1.parseClassMethod (C:\codebase\react-demo\node_modules\acorn\dist\acorn.js:1137:25)
at Parser.pp$1.parseClass (C:\codebase\react-demo\node_modules\acorn\dist\acorn.js:1118:14)
at Parser.pp$1.parseStatement (C:\codebase\react-demo\node_modules\acorn\dist\acorn.js:697:19)
at Parser.pp$1.parseTopLevel (C:\codebase\react-demo\node_modules\acorn\dist\acorn.js:638:25)
at Parser.parse (C:\codebase\react-demo\node_modules\acorn\dist\acorn.js:516:17)
at Object.parse (C:\codebase\react-demo\node_modules\acorn\dist\acorn.js:3098:39)
at Parser.parse (C:\codebase\react-demo\node_modules\webpack\lib\Parser.js:902:15)
at DependenciesBlock.<anonymous> (C:\codebase\react-demo\node_modules\webpack\lib\NormalModule.js:104:16)
at DependenciesBlock.onModuleBuild (C:\codebase\react-demo\node_modules\webpack-core\lib\NormalModuleMixin.js:310:10)
at nextLoader (C:\codebase\react-demo\node_modules\webpack-core\lib\NormalModuleMixin.js:275:25)
at C:\codebase\react-demo\node_modules\webpack-core\lib\NormalModuleMixin.js:259:5
at Storage.finished (C:\codebase\react-demo\node_modules\enhanced-resolve\lib\CachedInputFileSystem.js:38:16)
at C:\codebase\react-demo\node_modules\graceful-fs\graceful-fs.js:78:16
at FSReqWrap.readFileAfterClose [as oncomplete] (fs.js:439:3)


My
webpack.config.js
looks like:

var webpack = require('webpack');
var path = require('path');
var HtmlWebpackPlugin = require('html-webpack-plugin');

var __dirname = path.resolve();

module.exports = {
context: __dirname + "/app",
entry: "./app.jsx",
output: {
path: __dirname + "/dist/",
filename: "bundle.min.js"
},
loaders: [{
test: /\.jsx?$/,
exclude: /node_modules/,
loader: 'babel-loader',
}],
plugins: [
new webpack.optimize.DedupePlugin(),
new webpack.optimize.OccurenceOrderPlugin(),
new webpack.optimize.UglifyJsPlugin({ mangle: false, sourcemap: false }),
new HtmlWebpackPlugin({
template: 'index.html'
})
],
};


My app.jsx (located in ./app/app/jsx) is:

import React from 'react';
import ReactDOM from 'react-dom';

class App extends React.Component {

render() {
return <div > Test < /div>;
}
}

ReactDOM.render(<App/>, document.getElementById('app'));


I have following
.babelrc
:

{
"presets": ["es2015", "stage-0", "react"]
}


I have following node dependencies installed:

"devDependencies": {
"babel-core": "^6.13.2",
"babel-loader": "^6.2.4",
"babel-preset-es2015": "^6.13.2",
"babel-preset-react": "^6.11.1",
"babel-preset-stage-0": "^6.5.0",
"html-webpack-plugin": "^2.22.0",
"react": "^15.3.0",
"react-dom": "^15.3.0",
"webpack": "^1.13.1",
"webpack-dev-server": "^1.14.1"
}


Any idea what could I be missing?

Answer

The problem is in the loader configuration.

Property loaders should be in object module.

module.exports = {
    …
    module: {
        loaders: [{
            test: /\.jsx?$/,
            exclude: /node_modules/,
            loader: 'babel-loader',
        }],
    },
    …
};

See https://webpack.github.io/docs/loaders.html