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Configuring Babel
Babel is automatically configured for all .js and .jsx files via the
babel-loader with sensible defaults (e.g. with the env preset and
react if requested).
Need to extend the Babel configuration further? The easiest way is via
configureBabel():
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// webpack.config.js
// ...
Encore
// ...
// first, install any presets you want to use (e.g. yarn add babel-preset-es2017)
// then, modify the default Babel configuration
.configureBabel(function(babelConfig) {
// add additional presets
babelConfig.presets.push('es2017');
// no plugins are added by default, but you can add some
// babelConfig.plugins.push('styled-jsx/babel');
})
;Creating a .babelrc File
Instead of calling configureBabel(), you could create a .babelrc file
at the root of your project. This is a more "standard" way of configuring
Babel, but it has a downside: as soon as a .babelrc file is present,
Encore can no longer add any Babel configuration for you. For example,
if you call Encore.enableReactPreset(), the react preset will not
automatically be added to Babel: you must add it yourself in .babelrc.
An example .babelrc file might look like this:
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{
presets: [
['env', {
modules: false,
targets: {
browsers: '> 1%',
uglify: true
},
useBuiltIns: true
}]
]
}