{
  "type": "File",
  "start": 0,
  "end": 72,
  "loc": {
    "start": {
      "line": 1,
      "column": 0
    },
    "end": {
      "line": 3,
      "column": 1
    }
  },
  "program": {
    "type": "Program",
    "start": 0,
    "end": 72,
    "loc": {
      "start": {
        "line": 1,
        "column": 0
      },
      "end": {
        "line": 3,
        "column": 1
      }
    },
    "sourceType": "module",
    "interpreter": null,
    "body": [
      {
        "type": "FunctionDeclaration",
        "start": 0,
        "end": 72,
        "loc": {
          "start": {
            "line": 1,
            "column": 0
          },
          "end": {
            "line": 3,
            "column": 1
          }
        },
        "id": {
          "type": "Identifier",
          "start": 9,
          "end": 12,
          "loc": {
            "start": {
              "line": 1,
              "column": 9
            },
            "end": {
              "line": 1,
              "column": 12
            },
            "identifierName": "foo"
          },
          "name": "foo"
        },
        "generator": false,
        "async": false,
        "params": [],
        "predicate": null,
        "returnType": {
          "type": "TypeAnnotation",
          "start": 14,
          "end": 49,
          "loc": {
            "start": {
              "line": 1,
              "column": 14
            },
            "end": {
              "line": 1,
              "column": 49
            }
          },
          "typeAnnotation": {
            "type": "ObjectTypeAnnotation",
            "start": 16,
            "end": 49,
            "loc": {
              "start": {
                "line": 1,
                "column": 16
              },
              "end": {
                "line": 1,
                "column": 49
              }
            },
            "callProperties": [],
            "properties": [
              {
                "type": "ObjectTypeProperty",
                "start": 18,
                "end": 47,
                "loc": {
                  "start": {
                    "line": 1,
                    "column": 18
                  },
                  "end": {
                    "line": 1,
                    "column": 47
                  }
                },
                "key": {
                  "type": "Identifier",
                  "start": 18,
                  "end": 33,
                  "loc": {
                    "start": {
                      "line": 1,
                      "column": 18
                    },
                    "end": {
                      "line": 1,
                      "column": 33
                    },
                    "identifierName": "@@asyncIterator"
                  },
                  "name": "@@asyncIterator"
                },
                "static": false,
                "proto": false,
                "kind": "init",
                "method": false,
                "value": {
                  "type": "FunctionTypeAnnotation",
                  "start": 35,
                  "end": 47,
                  "loc": {
                    "start": {
                      "line": 1,
                      "column": 35
                    },
                    "end": {
                      "line": 1,
                      "column": 47
                    }
                  },
                  "params": [],
                  "rest": null,
                  "returnType": {
                    "type": "StringTypeAnnotation",
                    "start": 41,
                    "end": 47,
                    "loc": {
                      "start": {
                        "line": 1,
                        "column": 41
                      },
                      "end": {
                        "line": 1,
                        "column": 47
                      }
                    }
                  },
                  "typeParameters": null
                },
                "variance": null,
                "optional": false
              }
            ],
            "indexers": [],
            "internalSlots": [],
            "exact": false,
            "inexact": false
          }
        },
        "body": {
          "type": "BlockStatement",
          "start": 50,
          "end": 72,
          "loc": {
            "start": {
              "line": 1,
              "column": 50
            },
            "end": {
              "line": 3,
              "column": 1
            }
          },
          "body": [
            {
              "type": "ReturnStatement",
              "start": 54,
              "end": 70,
              "loc": {
                "start": {
                  "line": 2,
                  "column": 2
                },
                "end": {
                  "line": 2,
                  "column": 18
                }
              },
              "argument": {
                "type": "TypeCastExpression",
                "start": 62,
                "end": 68,
                "loc": {
                  "start": {
                    "line": 2,
                    "column": 10
                  },
                  "end": {
                    "line": 2,
                    "column": 16
                  }
                },
                "expression": {
                  "type": "NumericLiteral",
                  "start": 62,
                  "end": 63,
                  "loc": {
                    "start": {
                      "line": 2,
                      "column": 10
                    },
                    "end": {
                      "line": 2,
                      "column": 11
                    }
                  },
                  "extra": {
                    "rawValue": 0,
                    "raw": "0"
                  },
                  "value": 0
                },
                "typeAnnotation": {
                  "type": "TypeAnnotation",
                  "start": 63,
                  "end": 68,
                  "loc": {
                    "start": {
                      "line": 2,
                      "column": 11
                    },
                    "end": {
                      "line": 2,
                      "column": 16
                    }
                  },
                  "typeAnnotation": {
                    "type": "AnyTypeAnnotation",
                    "start": 65,
                    "end": 68,
                    "loc": {
                      "start": {
                        "line": 2,
                        "column": 13
                      },
                      "end": {
                        "line": 2,
                        "column": 16
                      }
                    }
                  }
                },
                "extra": {
                  "parenthesized": true,
                  "parenStart": 61
                }
              }
            }
          ],
          "directives": []
        }
      }
    ],
    "directives": []
  }
}