3.1-multi-file-js-ts-entry/src/cycles.js

import Vehicle from "./vehicle";

/**
 * A bike is a 2-wheeled vehicle
 */
export class Bike extends Vehicle {
  constructor() {
    super(2);
  }
}

/**
 * A Unicycle is a 1-wheeled vehicle
 */
export class Unicycle extends Vehicle {
  constructor() {
    super(1);
  }
}