type NonFunctionPropertyNames<T> = {
    [K in keyof T]: T[K] extends Function ? never : K;
}[keyof T];

type NonFunctionProperties<T> = Pick<T, NonFunctionPropertyNames<T>>;

interface Service {
    id: string;
    name: string;
    description?: string;
    createdAt: Date;
    start(): void;
    stop(): Promise<void>;
    getData(): { value: number };
}

// Example Usage:
type ServiceData = NonFunctionProperties<Service>;

const serviceInstance: Service = {
    id: "svc-123",
    name: "Telemetry Service",
    createdAt: new Date(),
    start: () => console.log("Starting"),
    stop: async () => console.log("Stopping"),
    getData: () => ({ value: 42 }),
};

const dataOnly: ServiceData = {
    id: serviceInstance.id,
    name: serviceInstance.name,
    createdAt: serviceInstance.createdAt,
    // start, stop, getData are excluded
};

// This would cause a type error:
// const invalidDataOnly: ServiceData = { ...serviceInstance };