I don't think this should be in strictest, I think it's something that a lot of people use for .css files etc - its useful as a linter but not something I'd say should be in strictest

If people import .css files, they usually add a shims.d.ts file in there project.

// shims.d.ts
declare module "*.css" {
  declare const css: unknown;
  export default css;
}

As for me, personally, I use triple slash directive at the beginning of the app entrance file.

// main.tsx
/// <reference types="vite/client" />
import "tailwindcss/tailwind.css";
import ReactDOM from "react-dom/client";
import { App } from "./App.jsx";

// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
ReactDOM.createRoot(document.getElementById("root")!).render(<App />);

Yeah, this is what vite generates for you.

I'd really like to make this flag enabled by default in strict mode at some point.

Is it possible that we enable this flag when strict: true in TS 6.0? @jakebailey

I'll try to see if it can be enabled in 6.0 but I don't quite know for sure. It's a very breaky flag for many people.