karabiner caps to escape (caps if held)

gistfile1.txt

{
  "description": "Change caps_lock to escape. (Post caps_lock if held_down)",
  "manipulators": [
    {
      "from": {
        "key_code": "caps_lock",
        "modifiers": {
          "optional": [
            "any"
          ]
        }
      },
      "to": [
        {
          "key_code": "escape"
        }
      ],
      "to_if_held_down": [
        {
          "key_code": "caps_lock"
        }
      ],
      "type": "basic"
    }
  ]
}