loader jsx SyntaxError: Unexpected token
This question already has an answer here:
Add "babel-preset-react"
npm install babel-preset-react
and add "presets" option to babel-loader in your webpack.config.js
(or you can add it to your .babelrc or package.js: http://babeljs.io/docs/usage/babelrc/)
Here is an example webpack.config.js:
{
test: /.jsx?$/, // Match both .js and .jsx files
exclude: /node_modules/,
loader: "babel",
query:
{
presets:['react']
}
}
Recently Babel 6 was released and there was a major change: https://babeljs.io/blog/2015/10/29/6.0.0
If you are using react 0.14, you should use ReactDOM.render() (from require('react-dom') ) instead of React.render() : https://facebook.github.io/react/blog/#changelog
UPDATE 2018
Rule.query has already been deprecated in favour of Rule.options. Usage in webpack 4 is as follows:
npm install babel-loader babel-preset-react
Then in your webpack configuration (as an entry in the module.rules array in the module.exports object)
{
test: /.jsx?$/,
exclude: /node_modules/,
use: [
{
loader: 'babel-loader',
options: {
presets: ['react']
}
}
],
}
I ran into a similar issue when migrating from babel 5 to babel 6.
I was just running babel to compile the src to lib folder babel src --out-dir lib
I will share my setup for babel 6:
Ensure you have the following babel 6 devDependencies installed
"babel-core": "^6.7.6",
"babel-loader": "^6.2.4",
"babel-preset-es2015": "^6.6.0",
"babel-preset-react": "^6.5.0",
"babel-preset-stage-0": "^6.5.0"
Add your .babelrc file to the project:
{
"presets": ["es2015", "stage-0", "react"]
}
由于上面的答案仍然让一些人处于黑暗中，因此完整的webpack.config.js可能如下所示：
var path = require('path');
var config = {
entry: path.resolve(__dirname, 'app/main.js'),
output: {
path: path.resolve(__dirname, 'build'),
filename: 'bundle.js'
},
module: {
loaders: [{
test: /.jsx?$/,
loader: 'babel',
query:
{
presets:['es2015', 'react']
}
}]
},
};
module.exports = config;