My point is that plain CSS is already good at this. So then you don't need to make more components with their own interface to learn.

    <button class="btn large shadow">Edit</button>

    .btn {
      ...default button styles
    }

    .btn.large {
      font-size: larger;
    }

    .btn.shadow {
      box-shadow: 0 0 8px #0004;
    }