[
  {
    "type": "operator",
    "value": "typeof"
  },
  {
    "type": "identifier",
    "value": "this"
  },
  {
    "type": "punctuator",
    "value": "."
  },
  {
    "type": "identifier",
    "value": "interval"
  },
  {
    "type": "operator",
    "value": "!=="
  },
  {
    "type": "literal",
    "value": "'number'"
  },
  {
    "type": "indention",
    "value": 0
  }
]