restful-es7-class.js

class RestfulController {

  static validRequestMethods = [
    'get', 'post', 'put', 'patch', 'delete'
  ];

  constructor() {
    let implementedRequestMethods = [];

    if(new.target === RestfulController) {
      throw new TypeError('Cannot instantiate abstract class');
    }

    RestfulController.validRequestMethods.map((requestMethod) => {
      if(typeof this[requestMethod] === 'function') {
        implementedRequestMethods.push(requestMethod);
      }
    });
    
    if(implementedRequestMethods.length === 0) {
      throw new TypeError(`Class must implement at least one of; ${RestfulController.validRequestMethods.join(', ')}`);
    }
  }

}

class ResourceController extends RestfulController {

  constructor() {
    super();
  }
  
  get() {
    // HTTP GET
  }

}

let fooResourceController = new RestfulController; // Throws TypeError
let barResourceController = new ResourceController; // OK!