[TypeScript] Type check accross files

Currently:

// server/index.js

app.get("*", async (req) => {
  const pageContextInit = {
    url: req.url,
    someInitProp: 'hello :-)'
  }
  const pageContext = await renderPage(pageContextInit)
  // TS complains that `someNewProp` is not defined on `pageContext`
  console.log(pageContext.someNewProp) // prints `42`
});

// some.page.server.js

import type { PageContextBuiltIn } from "vite-plugin-ssr";

epxort async function onBeforeRender(pageContext: PageContextBuiltIn) {
  // TS complains that `someInitProp` is not defined on `pageContext`
  console.log(pageContext.someInitProp) // prints `hello :-)`
  return {
    pageContext: {
      someNewProp: 42
    },
  };
}

How can we improve the situation?

AFAICT, something like Next.js’ utility types don’t add any value compared to vite-plugin-ssr’s PageContextBuiltIn.

Contribution welcome.

CC @stouffi

[brillout]

I guess we’d need to try. PR welcome.

[brillout]

There doesn’t seem to be a way to achieve this; see disucssion at https://github.com/brillout/vite-plugin-ssr/pull/219.