what is export default in react code example

Example 1: export default react

import React from 'react'; // get the React object from the react module

class HelloWorld extends React.Component {
  render() {
    return <p>Hello, world!</p>;
  }
}

export default HelloWorld; // expose the HelloWorld component to other modules

Example 2: export default function react

export default () => (
  <pre>Header</pre>
)

Example 3: export default class react

class Template {}
class AnotherTemplate {}

export { Template, AnotherTemplate }

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