Custom durable objects in local Cloudflare development

[fezproof]

I was playing around with solid start and Cloudflare this week, and I found a need to have more that one durable object in the app at once. This was all easy to get running from a deployment point of view, exporting to classes from entry.server.ts works a charm, but was struggle to get them running locally.

// src/entry.server.ts
export { CharacterDurableObject } from "~/dos/character";
export { UserDurableObject } from "~/dos/user";

I ended up extending the default solid-start-cloudflare-workers plugin to allow me to define the Durable object classes in the miniflare config as imports to the Vite config itself.

import { UserDurableObject } from "./src/dos/user";
import { CharacterDurableObject } from "./src/dos/character";
export default defineConfig({
  plugins: [
    solid({
      ssr: true,
      adapter: {
        durableObjects: {
            DO_CHARACTER: CharacterDurableObject,
            DO_USER: UserDurableObject
          }
        }
    })
  ]
});

This works by then shimming the dev server for Miniflare by getting the class names and doing some remapping to make them globals. This method has some super big drawbacks, the most annoying one being that classes cannot use basepath imports anymore :(

I don't know enough about plugins in general, but I can see a way where the solid-start-cloudflare-workers adapter could read the raw miniflare config and prebundle the exported classes from the entry.server.ts file. I am happy to contribute if people are interested in this!

Link to source code https://github.com/fezproof/prometheus