score:2

you can add a variable called "name" like this

<!doctype html>
    <script>
    var name = "<?php echo json_encode($user->name); ?>";
    </script>
    <body>
        <div id="greeting-div"></div>
    </body>
</html>

and edit js file like this

 reactdom.render(
    <greeting name={name}/>,
    document.getelementbyid('greeting-div')
  );

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