Karabiner-elements rule to remap press-hold ESC to cmd-W

hold-esc-to-cmd-w.json

{
  "title": "Hold Keys",
  "rules": [
    {
      "description": "Hold Esc to cmd+W",
      "manipulators": [
        {
          "type": "basic",
          "from": {
            "key_code": "escape"
          },
          "to": [
            {
              "key_code": "escape"
            }
          ],
          "to_if_held_down": [
            {
              "key_code": "w",
              "modifiers": ["right_command"]
            }
          ],
          "conditions": [
          ]
        }
      ]
    }
  ]
}