Source: 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);
    }
}