Fix custom APIs types

[infomiho]

I was building a custom API endpoint:

import { GetStaticResource } from "wasp/server/api";

export const getStaticResource: GetStaticResource = async (
  req,
  res,
  context
) => {
  return res.json({ message: "Hello from getStaticResource" });
};

When I type res. I don't get any autocomplete. When I clicked through the types of Api I found this:

It complains we are missing @types/express.

And when I changed express to express-serve-static-core, the types auto-complete worked.

Proposed implementation

We should either swap out express for express-serve-static-core when we are after Express types or investigate if there is a better way (a newer way) to get the Express types since Express development started again. (Maybe the solution will be upgrading to Express v5 in the end?)

[cprecioso]

We should either swap out express for express-serve-static-core when we are after Express types or investigate if there is a better way [...]

Why not just install @types/express if we're using the express package?

[sodic]

What about express-static-core? I see that's still in the dependencies array. Should it be?

Also, it seems we left @types/express in the ServerGenerator. We should probably remove it.

[cprecioso]

We're still using both:

wasp/waspc/data/Generator/templates/sdk/wasp/server/_types/index.ts

Lines 3 to 7 in 79992e9

	import { type Request, type Response } from 'express'
	import {
	type ParamsDictionary as ExpressParams,
	type Query as ExpressQuery,
	} from 'express-serve-static-core'

@types/express-serve-static-core's Request and Response are not exactly the ones from @types/express, and @types/express doesn't export Query or ParamsDictionary. That's why I kept both.