How to Explicitly Type `RpcClients` for an RPC Group in TypeScript?

declare namespace ApiRpcClient {
  type ApiRpcClientShape = // what goes here?
}

export class ApiRpcClient extends Context.Tag("ApiRpcClient")<
  ApiRpcClient,
  ApiRpcClient.ApiRpcClientShape
>() {}

export const ApiRpcClientLayer = Layer.scoped(
  ApiRpcClient,
  Effect.gen(function* () {
    const client = yield* RpcClient.make(ApiRpc);
    return ApiRpcClient.of(
      client,
    );
  }),
)