feat(remix-testing): cast types to use Remix type definitions + allow passing context

[mcansh]

before if you tried to pass a loader/action directly to the route object it would fail as context is optional in RR, but required in Remix (types for each are also different, bug would remain if required), so you would have to manually pass context: {}

import { json, type DataFunctionArgs } from "@remix-run/node";
import { unstable_createRemixStub as createRemixStub } from "@remix-run/testing";

export async function loader(args: DataFunctionArgs) {
  return json({ hi: "there" });
}

createRemixStub([
  {
    path: "/example",
    loader: args => loader({ ...args, context: {} }),
  },
]);

now we're using the Remix types for loader/action, but we need to cast them on the way out back to RR for use with createMemoryRouter

import { json, type DataFunctionArgs } from "@remix-run/node";
import { unstable_createRemixStub as createRemixStub } from "@remix-run/testing";

export async function loader(args: DataFunctionArgs) {
  return json({ hi: "there" });
}

createRemixStub([
  {
    path: "/example",
    loader,
  },
]);

this PR also introduces the ability to pass context to your stubbed loaders/actions via a second argument to createRemixStub

unstable_createRemixStub(
  [
    {
      path: "/",
      index: true,
      element: <App />,
      loader({ context }) {
        return json(context);
      },
    },
  ],
  { context: "hello" }
);

closes #6054

• Docs
• Tests

Testing Strategy: new tests

[changeset-bot]

🦋 Changeset detected

Latest commit: 9e3d7f8

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 18 packages

Name	Type
@remix-run/testing	Patch
create-remix	Patch
remix	Patch
@remix-run/architect	Patch
@remix-run/cloudflare	Patch
@remix-run/cloudflare-pages	Patch
@remix-run/cloudflare-workers	Patch
@remix-run/css-bundle	Patch
@remix-run/deno	Patch
@remix-run/dev	Patch
@remix-run/eslint-config	Patch
@remix-run/express	Patch
@remix-run/netlify	Patch
@remix-run/node	Patch
@remix-run/react	Patch
@remix-run/serve	Patch
@remix-run/server-runtime	Patch
@remix-run/vercel	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[github-actions]

🤖 Hello there,

We just published version v0.0.0-nightly-987ee78-20230414 which includes this pull request. If you'd like to take it for a test run please try it out and let us know what you think!

Thanks!