TypeScript
The @cloudflare/workers-types package provides the Service and DurableObjectNamespace types, each of which accepts a single type parameter for the server-side WorkerEntrypoint or DurableObject types.
Using higher-order types, we automatically generate client-side stub types (e.g., forcing all methods to be async).
For example:
interface Env { SUM_SERVICE: Service<SumService>; COUNTER_OBJECT: DurableObjectNamespace<Counter>
}
export default { async fetch(req, env, ctx): Promise<Response> { const result = await env.SUM_SERVICE.sum(1, 2); return new Response(result.toString()); }
} satisfies ExportedHandler<Env>;