// Extracts the names of properties that are functions
type FunctionPropertyNames<T> = {
  [K in keyof T]: T[K] extends Function ? K : never;
}[keyof T];

// Extracts the names of properties that are NOT functions
type NonFunctionPropertyNames<T> = {
  [K in keyof T]: T[K] extends Function ? never : K;
}[keyof T];

interface MyService {
  id: string;
  name: string;
  version: number;
  getData(): Promise<any>;
  saveData(data: any): void;
  config: { url: string };
}

type ServiceMethods = FunctionPropertyNames<MyService>; // 'getData' | 'saveData'
type ServiceProperties = NonFunctionPropertyNames<MyService>; // 'id' | 'name' | 'version' | 'config'

// Example usage with Pick
type ServiceAPI = Pick<MyService, ServiceMethods>; // { getData(): Promise<any>; saveData(data: any): void; }
type ServiceData = Pick<MyService, ServiceProperties>; // { id: string; name: string; version: number; config: { url: string }; }

const api: ServiceAPI = {
  getData: async () => 'some data',
  saveData: (data) => console.log('saving', data)
};

const data: ServiceData = {
  id: 'svc-001',
  name: 'My Awesome Service',
  version: 1.0,
  config: { url: 'http://localhost:3000' }
};

// console.log(api);
// console.log(data);