ast.json

{
  "type": "BlockStatement",
  "body": [
    {
      "type": "VariableDeclaration",
      "declarations": [
        {
          "type": "VariableDeclarator",
          "id": {
            "type": "Identifier",
            "name": "x"
          },
          "init": {
            "type": "YieldExpression",
            "argument": {
              "type": "Literal",
              "value": 3,
              "raw": "3"
            },
            "delegate": false,
            "do.yieldName": "_v87fg9l0l",
            "do.yields": []
          },
          "do.yields": [
            "_v87fg9l0l"
          ]
        }
      ],
      "kind": "const",
      "do.yields": [
        "_v87fg9l0l"
      ]
    },
    {
      "type": "VariableDeclaration",
      "declarations": [
        {
          "type": "VariableDeclarator",
          "id": {
            "type": "Identifier",
            "name": "y"
          },
          "init": {
            "type": "YieldExpression",
            "argument": {
              "type": "Literal",
              "value": null,
              "raw": "null"
            },
            "delegate": false,
            "do.yieldName": "_pjt6zwa1l",
            "do.yields": []
          },
          "do.yields": [
            "_pjt6zwa1l"
          ]
        }
      ],
      "kind": "const",
      "do.yields": [
        "_pjt6zwa1l"
      ]
    },
    {
      "type": "ReturnStatement",
      "argument": {
        "type": "BinaryExpression",
        "operator": "+",
        "left": {
          "type": "Identifier",
          "name": "x"
        },
        "right": {
          "type": "Identifier",
          "name": "y"
        },
        "do.yields": []
      },
      "do.yields": []
    }
  ],
  "do.yields": [
    "_v87fg9l0l",
    "_pjt6zwa1l"
  ]
}