Example Worker Script

import { DurableObject } from "cloudflare:workers";

export interface Env {
  MY_DURABLE_OBJECT: DurableObjectNamespace<MyDurableObject>;
}

// Durable Object
export class MyDurableObject extends DurableObject {
  sql: SqlStorage;
  constructor(ctx: DurableObjectState, env: Env) {
    super(ctx, env);
    this.sql = ctx.storage.sql;
    this.sql.exec(`
      CREATE TABLE IF NOT EXISTS my_table (
        id INTEGER PRIMARY KEY,
        data TEXT
      );
    `);
  }

  async sayHello(): Promise<string> {
    return "Hello, World!";
  }
}

// Worker
export default {
  async fetch(request, env) {
    const id = env.MY_DURABLE_OBJECT.idFromName("foo");
    const stub = env.MY_DURABLE_OBJECT.get(id);
    const rpcResponse = await stub.sayHello();
    return new Response(rpcResponse);
  },
} satisfies ExportedHandler<Env>;