Interface Segregation Principle

Create highly specialized interfaces designed for a specific client. Customers should not be dependent on interfaces that they do not use.

interface ITodoList {
    items: ITodo[];
}

interface IWeatherList extends ITodoList {
    getWeather: () => void;
    getWeekForecast: () => void;
}

class TodoList implements IWeatherList {
    constructor(items: ITodo[]) {
        this.items = items;
    }
}

Example Solution

class TodoList implements ITodoList {}