feat: expose setReactRouterDevLoadContext function

[albertusdev]

Purpose

This PR exposes the setReactRouterDevLoadContext function from the vite plugin, allowing developers to easily set a custom load context for the dev server without requiring a custom server entrypoint.

Problem

Currently, to provide a custom "load context" for server-side loaders and actions during development, developers must either:

1. Set up a custom server entrypoint with more complex configuration, as shown in Vercel's documentation:

// vite.config.ts
export default defineConfig(({ isSsrBuild }) => ({
  build: {
    rollupOptions: isSsrBuild
      ? {
          input: './server/app.ts',
        }
      : undefined,
  },
  plugins: [reactRouter(), /* other plugins */],
}));

// server/app.ts
export default app.fetch;

2. Or even goes to the length of implementing a custom server & dev server as seen in https://github.com/remix-run/react-router-templates/tree/main/node-custom-server

Both approaches require additional configuration and setup just to supply environment variables or other data to loaders and actions during development.

Solution

By exposing the existing setReactRouterDevLoadContext function, developers can achieve the same result with a much simpler approach:

// vite.config.ts
import { reactRouter, setReactRouterDevLoadContext } from '@react-router/dev/vite';

// Set a custom load context for the dev server
setReactRouterDevLoadContext((request) => {
  return {
    env: {
      API_KEY: process.env.API_KEY,
      // Other environment variables
    },
    // Other context data
  };
});

export default {
  plugins: [
    reactRouter(),
    // Other plugins
  ],
};

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[remix-cla-bot]

Hi @albertusdev,

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Thanks!

- The Remix team

[remix-cla-bot]

Thank you for signing the Contributor License Agreement. Let's get this merged! 🥳

[albertusdev]

hi @brophdawg11! sorry for the tag here, not sure which contributors should I ping to get this small PR reviewed. appreciate your help here!