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// webpack.config.js
// ...

Encore
    // ...

    .configureBabel(function(babelConfig) {
        // add additional presets
        babelConfig.presets.push('@babel/preset-flow');

        // no plugins are added by default, but you can add some
        babelConfig.plugins.push('styled-jsx/babel');
    }, {
        // node_modules is not processed through Babel by default
        // but you can allow some specific modules to be processed
        includeNodeModules: ['foundation-sites'],

        // or completely control the exclude rule (note that you
        // can't use both "includeNodeModules" and "exclude" at
        // the same time)
        exclude: /bower_components/
    })
;