[typescript - 2.2] Support for spread operator on JSX element children

[kennyd98]

• JSX 엘리먼트 안에 스프레드 연산자 사용 허용
• Spec proposal: extending the language to allow spreading children facebook/jsx#57

function Todo(prop: { key: number, todo: string }) {
    return <div>{prop.key.toString() + prop.todo}</div>;
}

function TodoList({ todos }: TodoListProps) {
    return <div>
        {...todos.map(todo => <Todo key={todo.id} todo={todo.todo} />)}
    </div>;
}

let x: TodoListProps;

<TodoList {...x} />