submit2.js

type AddTodo = (todo: string) => void
const submit = (todo: StreamBox<string>, addTodo: AddTodo) =>
    h('button', {
        props: { className: 'add-todo-submit' },
        events: {
            click: (e) => {
                e.preventDefault()
                addTodo(todo.get())
                todo.set('')
            }
        },
        children: [
            text('Add')
        ]
    })