{
  "type": "Program",
  "statements": [
    {
      "type": "VariableDeclaration",
      "declarations": [
        {
          "type": "VariableDeclarator",
          "id": {
            "type": "Identifier",
            "name": "a",
            "typeAnnotation": {
              "type": "TSTypeLiteral",
              "members": [
                {
                  "type": "TSPropertySignature",
                  "computed": false,
                  "optional": false,
                  "readonly": false,
                  "key": {
                    "type": "Identifier",
                    "name": "a",
                    "decorators": [],
                    "loc": {
                      "start": {
                        "line": 17,
                        "column": 10
                      },
                      "end": {
                        "line": 17,
                        "column": 11
                      }
                    }
                  },
                  "typeAnnotation": {
                    "type": "TSNumberKeyword",
                    "loc": {
                      "start": {
                        "line": 17,
                        "column": 13
                      },
                      "end": {
                        "line": 17,
                        "column": 19
                      }
                    }
                  },
                  "loc": {
                    "start": {
                      "line": 17,
                      "column": 10
                    },
                    "end": {
                      "line": 17,
                      "column": 21
                    }
                  }
                }
              ],
              "loc": {
                "start": {
                  "line": 17,
                  "column": 8
                },
                "end": {
                  "line": 17,
                  "column": 21
                }
              }
            },
            "decorators": [],
            "loc": {
              "start": {
                "line": 17,
                "column": 5
              },
              "end": {
                "line": 17,
                "column": 6
              }
            }
          },
          "init": {
            "type": "ObjectExpression",
            "properties": [
              {
                "type": "Property",
                "method": false,
                "shorthand": false,
                "computed": false,
                "key": {
                  "type": "Identifier",
                  "name": "a",
                  "decorators": [],
                  "loc": {
                    "start": {
                      "line": 17,
                      "column": 26
                    },
                    "end": {
                      "line": 17,
                      "column": 27
                    }
                  }
                },
                "value": {
                  "type": "NumberLiteral",
                  "value": 5,
                  "loc": {
                    "start": {
                      "line": 17,
                      "column": 29
                    },
                    "end": {
                      "line": 17,
                      "column": 30
                    }
                  }
                },
                "kind": "init",
                "loc": {
                  "start": {
                    "line": 17,
                    "column": 26
                  },
                  "end": {
                    "line": 17,
                    "column": 30
                  }
                }
              },
              {
                "type": "Property",
                "method": false,
                "shorthand": false,
                "computed": false,
                "key": {
                  "type": "Identifier",
                  "name": "b",
                  "decorators": [],
                  "loc": {
                    "start": {
                      "line": 17,
                      "column": 32
                    },
                    "end": {
                      "line": 17,
                      "column": 33
                    }
                  }
                },
                "value": {
                  "type": "StringLiteral",
                  "value": "foo",
                  "loc": {
                    "start": {
                      "line": 17,
                      "column": 35
                    },
                    "end": {
                      "line": 17,
                      "column": 40
                    }
                  }
                },
                "kind": "init",
                "loc": {
                  "start": {
                    "line": 17,
                    "column": 32
                  },
                  "end": {
                    "line": 17,
                    "column": 40
                  }
                }
              }
            ],
            "loc": {
              "start": {
                "line": 17,
                "column": 24
              },
              "end": {
                "line": 17,
                "column": 42
              }
            }
          },
          "loc": {
            "start": {
              "line": 17,
              "column": 5
            },
            "end": {
              "line": 17,
              "column": 42
            }
          }
        }
      ],
      "kind": "var",
      "loc": {
        "start": {
          "line": 17,
          "column": 1
        },
        "end": {
          "line": 17,
          "column": 43
        }
      }
    }
  ],
  "loc": {
    "start": {
      "line": 1,
      "column": 1
    },
    "end": {
      "line": 17,
      "column": 43
    }
  }
}
TypeError: Object literal may only specify known properties, and "b" does not exist in type '{ a: number; }'. [objectLiteralAssignability2.ts:17:32]