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Set a client-side state variable. No server round-trip. 
{
  "type": "object",
  "properties": {
    "action": {
      "const": "setState",
      "default": "setState",
      "type": "string"
    },
    "key": {
      "description": "State key to set",
      "type": "string"
    },
    "value": {
      "default": "{{ $event }}",
      "description": "Value to set. Use '{{ $event }}' for the event value."
    }
  },
  "required": [
    "action",
    "key"
  ]
}