YAML Anchors

Anchors can be used to reduce duplication.

&name - Define (can be done anywhere)
*name - Reference (must be defined first above the reference)

The merge operator << is not supported.

Example

_anchors: # Call this whatever you want but prefix it with _ so it does not conflict with anything in the future
  - &touchpad_interval_p 75
  - &touchpad_interval_n -75
  
touchpad:
  gestures:
    - type: swipe
      direction: up
      threshold: &touchpad_swipe_threshold 100 # This will work too

      actions:
        - on: update
          interval: *touchpad_interval_n
          # ...
          
        - on: update
          interval: *touchpad_interval_p
          # ...