lemmy-ui/src/client/index.tsx

import { Component } from "inferno";
import { hydrate } from 'inferno-hydrate';
import { BrowserRouter } from "inferno-router";
import App from "./components/App/App";
import { initDevTools } from "inferno-devtools";

declare global {
  interface Window { 
    isoData: {
      name: string,
    }
  }
}

const wrapper = (
   <BrowserRouter>
      <App name={window.isoData.name}/>
   </BrowserRouter>
);
initDevTools();
hydrate(wrapper, document.getElementById("root"));