createVariableTypeContainer_(types) {
    const selectDiv = document.createElement('select');
    for (let i = 0; i < types.length; i++) {
      const type = types[i];
      const displayName = type[0];
      const typeName = type[1];
      const option = document.createElement('option');
      option.classList.add('input-modal-type');
      option.value = typeName;
      option.innerText = displayName;
      selectDiv.appendChild(option);
    }
    this.firstTypeInput_ = selectDiv.querySelector('.input-modal-type');
    return selectDiv;
  }
The element holding the input type.
@override