{
  "type": "File",
  "start":0,"end":28,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":28}},
  "errors": [
    "SyntaxError: Binding invalid left-hand side in function parameter list. (1:9)"
  ],
  "program": {
    "type": "Program",
    "start":0,"end":28,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":28}},
    "sourceType": "module",
    "interpreter": null,
    "body": [
      {
        "type": "VariableDeclaration",
        "start":0,"end":28,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":28}},
        "declarations": [
          {
            "type": "VariableDeclarator",
            "start":4,"end":28,"loc":{"start":{"line":1,"column":4},"end":{"line":1,"column":28}},
            "id": {
              "type": "Identifier",
              "start":4,"end":5,"loc":{"start":{"line":1,"column":4},"end":{"line":1,"column":5},"identifierName":"x"},
              "name": "x"
            },
            "init": {
              "type": "ArrowFunctionExpression",
              "start":8,"end":28,"loc":{"start":{"line":1,"column":8},"end":{"line":1,"column":28}},
              "id": null,
              "generator": false,
              "async": false,
              "params": [
                {
                  "type": "ThisExpression",
                  "start":9,"end":22,"loc":{"start":{"line":1,"column":9},"end":{"line":1,"column":22}},
                  "typeAnnotation": {
                    "type": "TypeAnnotation",
                    "start":14,"end":22,"loc":{"start":{"line":1,"column":14},"end":{"line":1,"column":22}},
                    "typeAnnotation": {
                      "type": "NumberTypeAnnotation",
                      "start":16,"end":22,"loc":{"start":{"line":1,"column":16},"end":{"line":1,"column":22}}
                    }
                  }
                }
              ],
              "body": {
                "type": "NumericLiteral",
                "start":27,"end":28,"loc":{"start":{"line":1,"column":27},"end":{"line":1,"column":28}},
                "extra": {
                  "rawValue": 0,
                  "raw": "0"
                },
                "value": 0
              }
            }
          }
        ],
        "kind": "let"
      }
    ],
    "directives": []
  }
}