It's referred to as the @babel/preset-react. It is the preset that handles the transformation of JSX in React into actual JavaScript code that browsers comprehend.
How it works:
JSX isn't valid JavaScript and thus needs to be transformed into a series of calls to React.createElement(), something that a browser can then execute.
@babel/preset-react is a preset configuration for Babel comprising all necessary plugins that'll help translate JSX into actual JavaScript code.
Use this Babel plugin by first installing @babel/preset-react as a development dependency in your project:
npm install --save-dev @babel/preset-react