Add fs-routes and Remix adapter package

[markdalgleish]

This PR makes FS routing a more first class part of React Router 7 and not just a Remix backwards compatibility layer. To achieve this, @react-router/remix-v2-routes has been split into two packages:

• @react-router/fs-routes
• @react-router/remix-config-routes-adapter

fs-routes

In this PR, this package exports a flatRoutes function — deliberately leaving room for a nestedRoutes function in the future.

For most consumers, whether coming from Remix or starting fresh with React Router, the setup will look like this:

import { type RouteConfig } from "@react-router/dev/routes";
import { flatRoutes } from "@react-router/fs-routes";

export const routes: RouteConfig = flatRoutes();

The rootDirectory and ignoredRouteFiles are also supported here, but notably the routes option from Remix has now been moved out.

remix-config-routes-adapter

This package only exists to provide a backwards compatibility layer for Remix's routes option, ensuring that anyone using this option has a much smoother migration process. This is particularly useful if they're using an alternative file system routing implementation that they don't control, like remix-flat-routes:

import { type RouteConfig } from "@react-router/dev/routes";
import { remixConfigRoutes } from "@react-router/remix-config-routes-adapter";
import { flatRoutes } from "remix-flat-routes";

export const routes: RouteConfig = remixConfigRoutes(async defineRoutes => {
  return flatRoutes('routes', defineRoutes);
});

Note that since this package has been split from fs-routes, you no longer need to set ignoredRouteFiles: ['**/*'] as seen in the remix-flat-routes readme 🥳

[changeset-bot]

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Latest commit: 1969982

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[markdalgleish]

I opted to clean up this skipped test while I was here.

[github-actions]

🤖 Hello there,

We just published version 6.28.2-pre.0 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!