You are browsing the Symfony 4 documentation, which changes significantly from Symfony 3.x. If your app doesn't use Symfony 4 yet, browse the Symfony 3.4 documentation.
Using React? Make sure you have React installed, along with the babel-preset-react:
$ yarn add --dev babel-preset-react $ yarn add react react-dom prop-types
Enable react in your
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// webpack.config.js // ... Encore // ... .enableReactPreset() ;
That's it! Your
.jsx files will now be transformed through
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