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playground to test code. It runs a full
Node.js environment and already has all of
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react with all
npm packages installed. Try it out:
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Note: by default, React will be in development mode. The development version includes extra warnings about common mistakes, whereas the production version includes extra performance optimizations and strips all error messages.
To use React in production mode, set the environment variable
production. A minifier that performs dead-code elimination such as UglifyJS is recommended to completely remove the extra code present in development mode.
var React = require('react');