Learn TypeScript 3 by Building Web Applications

Creating the TodoListView interface

We'll start with the TodoListView interface:

interface TodoListView { 
    render(todoList: ReadonlyArray<TodoItem>): void; 
    getInput(): TodoItem; 
    getFilter(): string; 
    clearInput(): void; 
    filter(): void; 
} 

Next, we will create an HTML-based implementation of this interface.