Webpack cannot identify my JSX syntax inside my js file

Question

When i try to bundle my modules with webpack, it cannot identify the JSX syntax inside my index.js file and gives the following error:

ERROR in ./src/index.js 29:3
Module parse failed: Unexpected token (29:3)
You may need an appropriate loader to handle this file type.
|               const searchTerm = _.debounce(term =>     {this.searchTerm(term)}, 300);
|               return (
>                       <div>
|                               <SearchBar onInputChange= {searchTerm}/>
|                               <div className="row">
 @ multi (webpack)-dev-server/client?http://localhost:8080 ./src/index.js     main[1]

This is my webpack config:

const Path = require('path');

module.exports = {
  entry: ['./src/index.js'],
  output: {
    path: __dirname,
    publicPath: '/',
    filename: 'bundle.js'
  },


 module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        include: Path.resolve(__dirname, '../src'),
        use: {
          loader: 'babel-loader',
           options: {
            presets: ["@babel/preset-react",  "@babel/preset-env"]
          } 
        }
      },
      {
        test: /\.css$/,
        exclude: /node_modules/,  
        use: [ 'css-loader' ]
      }
    ]
  },
  resolve: {
    extensions: ['*', '.js', '.jsx']
  },
  devServer: {
    historyApiFallback: true,
    contentBase: './',
    watchOptions: {
      aggregateTimeout: 300,
      poll: 1000
    }
  }
};

I have added the babel presets for react namely @babel/preset-react. I have also added the babel-loader but still it cannot identify the JSX syntax.

github.com/kryptokinght/react-youtube-clone/blob/master/… @RomanMaksimov — kryptokinght
You may try to add babel-preset-react-app preset (nom i babel-preset-react-app or yarn add babel-preset-react-app) and use "presets": ["react-app"]. Also it's better to dedicate the babel options into a .babelrc file in the root of the app — Roman Maksimov

ickyrr ickyrr · Accepted Answer · 2018-08-31T14:29:27

I cloned your repo and found a bunch of conflicts on your code setup.

Some of your packages are not aligned with the latest versions of your @babel/core package. If you are going to use the latest version of babel, might as well use the latest presets.

`

devDependencies: {
  @babel/cli: ^7.0.0,
  @babel/core: ^7.0.0,
  @babel/preset-env: ^7.0.0,
  @babel/preset-react: ^7.0.0,
  babel-loader: ^8.0.0"
}

`

and I removed babel-preset-env and babel-preset-react (the old versions) on your dependencies.

Pick one babel configuration. It's either on your package.json or on .babelrc. I suggest you stick with the .babelrc file. And changed the values of the presets property.
```
`"presets": ["@babel/preset-react", "@babel/preset-env"],`
```
On your webpack.config.js you don't need to do include: include: Path.resolve(__dirname, './src'). You can also remove this line:
```
`presets: ["react", "env"]`
```

and BTW, on your package.json,

"scripts": { - "start": "node ./node_modules/webpack-dev-server/bin/webpack-dev-server.js", + "start": "webpack-dev-server --mode development", ...

when you run npm start your project will look into a locally installed webpack-dev-server and use the global one if it does not find the local package.

Hope this helps. :)

Webpack cannot identify my JSX syntax inside my js file

1 Answers