Leak led blinking, pulsating or other mrugating (mrygać)

ESPHome
1

"Hello everyone,

This is my first post on the forum, and I hope I won’t annoy anyone with such a trivial question, but even Uncle Google couldn’t help me.
What’s wrong with this code?"

binary_sensor:
  - platform: esp32_touch
    name: "Leak sensor"
    pin: GPIO27
    threshold: 20

light:
  - platform: binary
    id: lightleak
    output: ledleak
    internal: true
    effects:
      - pulse:
          name: "Pulsating Light"
          transition_length: 1s
          update_interval: 2s
          min_brightness: 0%
          max_brightness: 100%

output:
  - id: ledleak
    platform: gpio
    pin: GPIO19