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Remix uses app/entry.client.tsx (or .jsx) as the entry point for the browser bundle. This module gives you full control over the "hydrate" step after JavaScript loads into the document.

Typically this module uses ReactDOM.hydrate to re-hydrate the markup that was already generated on the server in your server entry module.

Here's a basic example:

import { hydrate } from "react-dom";
import { RemixBrowser } from "@remix-run/react";

hydrate(<RemixBrowser />, document);

This is the first piece of code that runs in the browser. As you can see, you have full control here. You can initialize client side libraries, setup things like window.history.scrollRestoration, etc.