interface Todo id: number; title: string; completed: boolean;
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<div class="todo-list"> <input type="text" [(ngModel)]="newTodoTitle"> <button (click)="addTodo()">Add</button> <ul> <li *ngFor="let todo of todos"> <input type="checkbox" [checked]="todo.completed" (change)="toggleCompleted(todo.id)"> <span [ngClass]=" 'completed': todo.completed "> todo.title </span> <button (click)="removeTodo(todo.id)">Remove</button> </li> </ul> </div> interface Todo id: number