main.ts

import { Tempo } from 'tempo-dom/lib/tempo'
import { simpleComponent } from 'tempo-dom/lib/html'

const component = simpleComponent<number, unknown>($ =>
  $.div($ =>
    $.class('app').div($ =>
      $.div($ => $.class(['count', 'count-small']).text('count'))
        .div($ => $.class('count').text(String))
        .div($ =>
          $.class('buttons')
            .button($ =>
              $.onClick(count => count - 1)
                .disabled(count => count <= 0)
                .text('-')
            )
            .button($ => $.onClick(count => count + 1).text('+'))
        )
    )
  )
)

Tempo.renderSimple({ component, state: 0 })