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Execute actions on a repeating schedule. 
{
  "type": "object",
  "properties": {
    "action": {
      "const": "setInterval",
      "default": "setInterval",
      "type": "string"
    },
    "duration": {
      "description": "Interval between ticks, in milliseconds.",
      "type": "integer"
    },
    "while": {
      "type": [
        "string",
        "null"
      ],
      "default": null,
      "description": "Condition expression re-evaluated each tick. When falsy, the interval stops."
    },
    "count": {
      "type": [
        "integer",
        "null"
      ],
      "default": null,
      "description": "Maximum number of ticks. The interval stops after this many."
    },
    "onTick": {
      "$ref": "Action",
      "description": "Action(s) to run each tick. $event is the tick number (1, 2, \u2026).",
      "default": null
    },
    "onComplete": {
      "$ref": "Action",
      "description": "Action(s) to run when the interval finishes.",
      "default": null
    }
  },
  "required": [
    "action",
    "duration"
  ]
}