"variables" undefined in nested configuration templates

Checklist

• [x ] I updated the card to the latest version available
• [ x] I cleared the cache of my browser

Describe the bug I’ve declared a configuration template that is nested within another configuration template. The nested template cannot take variables sent to it (from local config), and pass them through to the parent template.

Version of the card Version: 3.4.2

To Reproduce This is the configuration I used:

button_card_templates:

  button_info:
    variables:
      info_icon: information
    show_label: true
    label: '[[[ return variables.info ]]]'
    icon: '[[[ return "mdi:" + variables.info_icon ]]]'

  sensor_battery_info:
    template: button_info
    variables:
      info: '[[[ return states[variables.info_entity].state + "%" ]]]'
      info_icon: battery

# This works fine
type: custom:button-card
  template: button_info
  entity: media_player.player1
  variables:
    info: 'Player1 active'

# This throws the error below
type: custom:button-card
  template: sensor_battery_info
  entity: binary_sensor.contact_sensor_01
  variables:
    info_entity: sensor.contact_sensor_01_power

Error message On Firefox: ButtonCardJSTemplateError: TypeError: variables is undefined in 'return states[variables.info_entity].state + "%"' On Edge: ButtonCardJSTemplateError: TypeError: Cannot read property 'info_entity' of undefined in 'return states[variables.info_entity].state + "%"'

Expected behavior The variables object should be available to the nested template at the time of defining its own variables, to allow passing variables: Local config > nested template > parent template. I cannot think of a workaround to this issue, unfortunately. I don’t think a second (non-nested) template would solve this.

Desktop (please complete the following information):

• Browser: tested on Firefox and Edge.
• Version Firefox 91.0.1, Edge 92.0.902.78

Smartphone (please complete the following information):

• Android 11 on Pixel 5, HASS Companion App

[RomRider]

You can’t reference variables inside other variables. That’s intended because too complex to handle.

[amitkeret]

where the variable ‘info_entity’ comes from?

Oooooops that’s a typo… should be the state of entity as expected. I’ve amended my comment above. I’m sorry @u8915055 for all the hairs you pulled 😨