{
  "type": "Script",
  "span": {
    "start": 62,
    "end": 852,
    "ctxt": 0
  },
  "body": [
    {
      "type": "TsInterfaceDeclaration",
      "span": {
        "start": 62,
        "end": 93,
        "ctxt": 0
      },
      "id": {
        "type": "Identifier",
        "span": {
          "start": 72,
          "end": 76,
          "ctxt": 0
        },
        "value": "Base",
        "optional": false
      },
      "declare": false,
      "typeParams": null,
      "extends": [],
      "body": {
        "type": "TsInterfaceBody",
        "span": {
          "start": 77,
          "end": 93,
          "ctxt": 0
        },
        "body": [
          {
            "type": "TsPropertySignature",
            "span": {
              "start": 79,
              "end": 91,
              "ctxt": 0
            },
            "readonly": false,
            "key": {
              "type": "Identifier",
              "span": {
                "start": 79,
                "end": 82,
                "ctxt": 0
              },
              "value": "foo",
              "optional": false
            },
            "computed": false,
            "optional": false,
            "init": null,
            "params": [],
            "typeAnnotation": {
              "type": "TsTypeAnnotation",
              "span": {
                "start": 82,
                "end": 90,
                "ctxt": 0
              },
              "typeAnnotation": {
                "type": "TsKeywordType",
                "span": {
                  "start": 84,
                  "end": 90,
                  "ctxt": 0
                },
                "kind": "string"
              }
            },
            "typeParams": null
          }
        ]
      }
    },
    {
      "type": "TsInterfaceDeclaration",
      "span": {
        "start": 94,
        "end": 141,
        "ctxt": 0
      },
      "id": {
        "type": "Identifier",
        "span": {
          "start": 104,
          "end": 111,
          "ctxt": 0
        },
        "value": "Derived",
        "optional": false
      },
      "declare": false,
      "typeParams": null,
      "extends": [
        {
          "type": "TsExpressionWithTypeArguments",
          "span": {
            "start": 120,
            "end": 124,
            "ctxt": 0
          },
          "expression": {
            "type": "Identifier",
            "span": {
              "start": 120,
              "end": 124,
              "ctxt": 0
            },
            "value": "Base",
            "optional": false
          },
          "typeArguments": null
        }
      ],
      "body": {
        "type": "TsInterfaceBody",
        "span": {
          "start": 125,
          "end": 141,
          "ctxt": 0
        },
        "body": [
          {
            "type": "TsPropertySignature",
            "span": {
              "start": 127,
              "end": 139,
              "ctxt": 0
            },
            "readonly": false,
            "key": {
              "type": "Identifier",
              "span": {
                "start": 127,
                "end": 130,
                "ctxt": 0
              },
              "value": "bar",
              "optional": false
            },
            "computed": false,
            "optional": false,
            "init": null,
            "params": [],
            "typeAnnotation": {
              "type": "TsTypeAnnotation",
              "span": {
                "start": 130,
                "end": 138,
                "ctxt": 0
              },
              "typeAnnotation": {
                "type": "TsKeywordType",
                "span": {
                  "start": 132,
                  "end": 138,
                  "ctxt": 0
                },
                "kind": "string"
              }
            },
            "typeParams": null
          }
        ]
      }
    },
    {
      "type": "TsInterfaceDeclaration",
      "span": {
        "start": 142,
        "end": 193,
        "ctxt": 0
      },
      "id": {
        "type": "Identifier",
        "span": {
          "start": 152,
          "end": 160,
          "ctxt": 0
        },
        "value": "Derived2",
        "optional": false
      },
      "declare": false,
      "typeParams": null,
      "extends": [
        {
          "type": "TsExpressionWithTypeArguments",
          "span": {
            "start": 169,
            "end": 176,
            "ctxt": 0
          },
          "expression": {
            "type": "Identifier",
            "span": {
              "start": 169,
              "end": 176,
              "ctxt": 0
            },
            "value": "Derived",
            "optional": false
          },
          "typeArguments": null
        }
      ],
      "body": {
        "type": "TsInterfaceBody",
        "span": {
          "start": 177,
          "end": 193,
          "ctxt": 0
        },
        "body": [
          {
            "type": "TsPropertySignature",
            "span": {
              "start": 179,
              "end": 191,
              "ctxt": 0
            },
            "readonly": false,
            "key": {
              "type": "Identifier",
              "span": {
                "start": 179,
                "end": 182,
                "ctxt": 0
              },
              "value": "baz",
              "optional": false
            },
            "computed": false,
            "optional": false,
            "init": null,
            "params": [],
            "typeAnnotation": {
              "type": "TsTypeAnnotation",
              "span": {
                "start": 182,
                "end": 190,
                "ctxt": 0
              },
              "typeAnnotation": {
                "type": "TsKeywordType",
                "span": {
                  "start": 184,
                  "end": 190,
                  "ctxt": 0
                },
                "kind": "string"
              }
            },
            "typeParams": null
          }
        ]
      }
    },
    {
      "type": "TsInterfaceDeclaration",
      "span": {
        "start": 195,
        "end": 233,
        "ctxt": 0
      },
      "id": {
        "type": "Identifier",
        "span": {
          "start": 205,
          "end": 206,
          "ctxt": 0
        },
        "value": "A",
        "optional": false
      },
      "declare": false,
      "typeParams": null,
      "extends": [],
      "body": {
        "type": "TsInterfaceBody",
        "span": {
          "start": 207,
          "end": 233,
          "ctxt": 0
        },
        "body": [
          {
            "type": "TsIndexSignature",
            "params": [
              {
                "type": "Identifier",
                "span": {
                  "start": 214,
                  "end": 223,
                  "ctxt": 0
                },
                "value": "x",
                "optional": false,
                "typeAnnotation": {
                  "type": "TsTypeAnnotation",
                  "span": {
                    "start": 215,
                    "end": 223,
                    "ctxt": 0
                  },
                  "typeAnnotation": {
                    "type": "TsKeywordType",
                    "span": {
                      "start": 217,
                      "end": 223,
                      "ctxt": 0
                    },
                    "kind": "number"
                  }
                }
              }
            ],
            "typeAnnotation": {
              "type": "TsTypeAnnotation",
              "span": {
                "start": 224,
                "end": 230,
                "ctxt": 0
              },
              "typeAnnotation": {
                "type": "TsTypeReference",
                "span": {
                  "start": 226,
                  "end": 230,
                  "ctxt": 0
                },
                "typeName": {
                  "type": "Identifier",
                  "span": {
                    "start": 226,
                    "end": 230,
                    "ctxt": 0
                  },
                  "value": "Base",
                  "optional": false
                },
                "typeParams": null
              }
            },
            "readonly": false,
            "static": false,
            "span": {
              "start": 213,
              "end": 231,
              "ctxt": 0
            }
          }
        ]
      }
    },
    {
      "type": "VariableDeclaration",
      "span": {
        "start": 235,
        "end": 244,
        "ctxt": 0
      },
      "kind": "var",
      "declare": false,
      "declarations": [
        {
          "type": "VariableDeclarator",
          "span": {
            "start": 239,
            "end": 243,
            "ctxt": 0
          },
          "id": {
            "type": "Identifier",
            "span": {
              "start": 239,
              "end": 240,
              "ctxt": 0
            },
            "value": "a",
            "optional": false,
            "typeAnnotation": {
              "type": "TsTypeAnnotation",
              "span": {
                "start": 240,
                "end": 243,
                "ctxt": 0
              },
              "typeAnnotation": {
                "type": "TsTypeReference",
                "span": {
                  "start": 242,
                  "end": 243,
                  "ctxt": 0
                },
                "typeName": {
                  "type": "Identifier",
                  "span": {
                    "start": 242,
                    "end": 243,
                    "ctxt": 0
                  },
                  "value": "A",
                  "optional": false
                },
                "typeParams": null
              }
            }
          },
          "init": null,
          "definite": false
        }
      ]
    },
    {
      "type": "VariableDeclaration",
      "span": {
        "start": 245,
        "end": 277,
        "ctxt": 0
      },
      "kind": "var",
      "declare": false,
      "declarations": [
        {
          "type": "VariableDeclarator",
          "span": {
            "start": 249,
            "end": 277,
            "ctxt": 0
          },
          "id": {
            "type": "Identifier",
            "span": {
              "start": 249,
              "end": 250,
              "ctxt": 0
            },
            "value": "b",
            "optional": false,
            "typeAnnotation": {
              "type": "TsTypeAnnotation",
              "span": {
                "start": 250,
                "end": 277,
                "ctxt": 0
              },
              "typeAnnotation": {
                "type": "TsTypeLiteral",
                "span": {
                  "start": 252,
                  "end": 277,
                  "ctxt": 0
                },
                "members": [
                  {
                    "type": "TsIndexSignature",
                    "params": [
                      {
                        "type": "Identifier",
                        "span": {
                          "start": 255,
                          "end": 264,
                          "ctxt": 0
                        },
                        "value": "x",
                        "optional": false,
                        "typeAnnotation": {
                          "type": "TsTypeAnnotation",
                          "span": {
                            "start": 256,
                            "end": 264,
                            "ctxt": 0
                          },
                          "typeAnnotation": {
                            "type": "TsKeywordType",
                            "span": {
                              "start": 258,
                              "end": 264,
                              "ctxt": 0
                            },
                            "kind": "number"
                          }
                        }
                      }
                    ],
                    "typeAnnotation": {
                      "type": "TsTypeAnnotation",
                      "span": {
                        "start": 265,
                        "end": 274,
                        "ctxt": 0
                      },
                      "typeAnnotation": {
                        "type": "TsTypeReference",
                        "span": {
                          "start": 267,
                          "end": 274,
                          "ctxt": 0
                        },
                        "typeName": {
                          "type": "Identifier",
                          "span": {
                            "start": 267,
                            "end": 274,
                            "ctxt": 0
                          },
                          "value": "Derived",
                          "optional": false
                        },
                        "typeParams": null
                      }
                    },
                    "readonly": false,
                    "static": false,
                    "span": {
                      "start": 254,
                      "end": 275,
                      "ctxt": 0
                    }
                  }
                ]
              }
            }
          },
          "init": null,
          "definite": false
        }
      ]
    },
    {
      "type": "ExpressionStatement",
      "span": {
        "start": 278,
        "end": 284,
        "ctxt": 0
      },
      "expression": {
        "type": "AssignmentExpression",
        "span": {
          "start": 278,
          "end": 283,
          "ctxt": 0
        },
        "operator": "=",
        "left": {
          "type": "Identifier",
          "span": {
            "start": 278,
            "end": 279,
            "ctxt": 0
          },
          "value": "a",
          "optional": false,
          "typeAnnotation": null
        },
        "right": {
          "type": "Identifier",
          "span": {
            "start": 282,
            "end": 283,
            "ctxt": 0
          },
          "value": "b",
          "optional": false
        }
      }
    },
    {
      "type": "ExpressionStatement",
      "span": {
        "start": 285,
        "end": 291,
        "ctxt": 0
      },
      "expression": {
        "type": "AssignmentExpression",
        "span": {
          "start": 285,
          "end": 290,
          "ctxt": 0
        },
        "operator": "=",
        "left": {
          "type": "Identifier",
          "span": {
            "start": 285,
            "end": 286,
            "ctxt": 0
          },
          "value": "b",
          "optional": false,
          "typeAnnotation": null
        },
        "right": {
          "type": "Identifier",
          "span": {
            "start": 289,
            "end": 290,
            "ctxt": 0
          },
          "value": "a",
          "optional": false
        }
      }
    },
    {
      "type": "VariableDeclaration",
      "span": {
        "start": 302,
        "end": 336,
        "ctxt": 0
      },
      "kind": "var",
      "declare": false,
      "declarations": [
        {
          "type": "VariableDeclarator",
          "span": {
            "start": 306,
            "end": 336,
            "ctxt": 0
          },
          "id": {
            "type": "Identifier",
            "span": {
              "start": 306,
              "end": 308,
              "ctxt": 0
            },
            "value": "b2",
            "optional": false,
            "typeAnnotation": {
              "type": "TsTypeAnnotation",
              "span": {
                "start": 308,
                "end": 336,
                "ctxt": 0
              },
              "typeAnnotation": {
                "type": "TsTypeLiteral",
                "span": {
                  "start": 310,
                  "end": 336,
                  "ctxt": 0
                },
                "members": [
                  {
                    "type": "TsIndexSignature",
                    "params": [
                      {
                        "type": "Identifier",
                        "span": {
                          "start": 313,
                          "end": 322,
                          "ctxt": 0
                        },
                        "value": "x",
                        "optional": false,
                        "typeAnnotation": {
                          "type": "TsTypeAnnotation",
                          "span": {
                            "start": 314,
                            "end": 322,
                            "ctxt": 0
                          },
                          "typeAnnotation": {
                            "type": "TsKeywordType",
                            "span": {
                              "start": 316,
                              "end": 322,
                              "ctxt": 0
                            },
                            "kind": "number"
                          }
                        }
                      }
                    ],
                    "typeAnnotation": {
                      "type": "TsTypeAnnotation",
                      "span": {
                        "start": 323,
                        "end": 333,
                        "ctxt": 0
                      },
                      "typeAnnotation": {
                        "type": "TsTypeReference",
                        "span": {
                          "start": 325,
                          "end": 333,
                          "ctxt": 0
                        },
                        "typeName": {
                          "type": "Identifier",
                          "span": {
                            "start": 325,
                            "end": 333,
                            "ctxt": 0
                          },
                          "value": "Derived2",
                          "optional": false
                        },
                        "typeParams": null
                      }
                    },
                    "readonly": false,
                    "static": false,
                    "span": {
                      "start": 312,
                      "end": 334,
                      "ctxt": 0
                    }
                  }
                ]
              }
            }
          },
          "init": null,
          "definite": false
        }
      ]
    },
    {
      "type": "ExpressionStatement",
      "span": {
        "start": 337,
        "end": 344,
        "ctxt": 0
      },
      "expression": {
        "type": "AssignmentExpression",
        "span": {
          "start": 337,
          "end": 343,
          "ctxt": 0
        },
        "operator": "=",
        "left": {
          "type": "Identifier",
          "span": {
            "start": 337,
            "end": 338,
            "ctxt": 0
          },
          "value": "a",
          "optional": false,
          "typeAnnotation": null
        },
        "right": {
          "type": "Identifier",
          "span": {
            "start": 341,
            "end": 343,
            "ctxt": 0
          },
          "value": "b2",
          "optional": false
        }
      }
    },
    {
      "type": "ExpressionStatement",
      "span": {
        "start": 345,
        "end": 352,
        "ctxt": 0
      },
      "expression": {
        "type": "AssignmentExpression",
        "span": {
          "start": 345,
          "end": 351,
          "ctxt": 0
        },
        "operator": "=",
        "left": {
          "type": "Identifier",
          "span": {
            "start": 345,
            "end": 347,
            "ctxt": 0
          },
          "value": "b2",
          "optional": false,
          "typeAnnotation": null
        },
        "right": {
          "type": "Identifier",
          "span": {
            "start": 350,
            "end": 351,
            "ctxt": 0
          },
          "value": "a",
          "optional": false
        }
      }
    },
    {
      "type": "TsModuleDeclaration",
      "span": {
        "start": 363,
        "end": 852,
        "ctxt": 0
      },
      "declare": false,
      "global": false,
      "id": {
        "type": "Identifier",
        "span": {
          "start": 370,
          "end": 378,
          "ctxt": 0
        },
        "value": "Generics",
        "optional": false
      },
      "body": {
        "type": "TsModuleBlock",
        "span": {
          "start": 379,
          "end": 852,
          "ctxt": 0
        },
        "body": [
          {
            "type": "TsInterfaceDeclaration",
            "span": {
              "start": 385,
              "end": 444,
              "ctxt": 0
            },
            "id": {
              "type": "Identifier",
              "span": {
                "start": 395,
                "end": 396,
                "ctxt": 0
              },
              "value": "A",
              "optional": false
            },
            "declare": false,
            "typeParams": {
              "type": "TsTypeParameterDeclaration",
              "span": {
                "start": 396,
                "end": 412,
                "ctxt": 0
              },
              "parameters": [
                {
                  "type": "TsTypeParameter",
                  "span": {
                    "start": 397,
                    "end": 411,
                    "ctxt": 0
                  },
                  "name": {
                    "type": "Identifier",
                    "span": {
                      "start": 397,
                      "end": 398,
                      "ctxt": 0
                    },
                    "value": "T",
                    "optional": false
                  },
                  "constraint": {
                    "type": "TsTypeReference",
                    "span": {
                      "start": 407,
                      "end": 411,
                      "ctxt": 0
                    },
                    "typeName": {
                      "type": "Identifier",
                      "span": {
                        "start": 407,
                        "end": 411,
                        "ctxt": 0
                      },
                      "value": "Base",
                      "optional": false
                    },
                    "typeParams": null
                  },
                  "default": null
                }
              ]
            },
            "extends": [],
            "body": {
              "type": "TsInterfaceBody",
              "span": {
                "start": 413,
                "end": 444,
                "ctxt": 0
              },
              "body": [
                {
                  "type": "TsIndexSignature",
                  "params": [
                    {
                      "type": "Identifier",
                      "span": {
                        "start": 424,
                        "end": 433,
                        "ctxt": 0
                      },
                      "value": "x",
                      "optional": false,
                      "typeAnnotation": {
                        "type": "TsTypeAnnotation",
                        "span": {
                          "start": 425,
                          "end": 433,
                          "ctxt": 0
                        },
                        "typeAnnotation": {
                          "type": "TsKeywordType",
                          "span": {
                            "start": 427,
                            "end": 433,
                            "ctxt": 0
                          },
                          "kind": "number"
                        }
                      }
                    }
                  ],
                  "typeAnnotation": {
                    "type": "TsTypeAnnotation",
                    "span": {
                      "start": 434,
                      "end": 437,
                      "ctxt": 0
                    },
                    "typeAnnotation": {
                      "type": "TsTypeReference",
                      "span": {
                        "start": 436,
                        "end": 437,
                        "ctxt": 0
                      },
                      "typeName": {
                        "type": "Identifier",
                        "span": {
                          "start": 436,
                          "end": 437,
                          "ctxt": 0
                        },
                        "value": "T",
                        "optional": false
                      },
                      "typeParams": null
                    }
                  },
                  "readonly": false,
                  "static": false,
                  "span": {
                    "start": 423,
                    "end": 438,
                    "ctxt": 0
                  }
                }
              ]
            }
          },
          {
            "type": "TsInterfaceDeclaration",
            "span": {
              "start": 450,
              "end": 521,
              "ctxt": 0
            },
            "id": {
              "type": "Identifier",
              "span": {
                "start": 460,
                "end": 461,
                "ctxt": 0
              },
              "value": "B",
              "optional": false
            },
            "declare": false,
            "typeParams": null,
            "extends": [
              {
                "type": "TsExpressionWithTypeArguments",
                "span": {
                  "start": 470,
                  "end": 477,
                  "ctxt": 0
                },
                "expression": {
                  "type": "Identifier",
                  "span": {
                    "start": 470,
                    "end": 471,
                    "ctxt": 0
                  },
                  "value": "A",
                  "optional": false
                },
                "typeArguments": {
                  "type": "TsTypeParameterInstantiation",
                  "span": {
                    "start": 471,
                    "end": 477,
                    "ctxt": 0
                  },
                  "params": [
                    {
                      "type": "TsTypeReference",
                      "span": {
                        "start": 472,
                        "end": 476,
                        "ctxt": 0
                      },
                      "typeName": {
                        "type": "Identifier",
                        "span": {
                          "start": 472,
                          "end": 476,
                          "ctxt": 0
                        },
                        "value": "Base",
                        "optional": false
                      },
                      "typeParams": null
                    }
                  ]
                }
              }
            ],
            "body": {
              "type": "TsInterfaceBody",
              "span": {
                "start": 478,
                "end": 521,
                "ctxt": 0
              },
              "body": [
                {
                  "type": "TsIndexSignature",
                  "params": [
                    {
                      "type": "Identifier",
                      "span": {
                        "start": 489,
                        "end": 498,
                        "ctxt": 0
                      },
                      "value": "x",
                      "optional": false,
                      "typeAnnotation": {
                        "type": "TsTypeAnnotation",
                        "span": {
                          "start": 490,
                          "end": 498,
                          "ctxt": 0
                        },
                        "typeAnnotation": {
                          "type": "TsKeywordType",
                          "span": {
                            "start": 492,
                            "end": 498,
                            "ctxt": 0
                          },
                          "kind": "number"
                        }
                      }
                    }
                  ],
                  "typeAnnotation": {
                    "type": "TsTypeAnnotation",
                    "span": {
                      "start": 499,
                      "end": 508,
                      "ctxt": 0
                    },
                    "typeAnnotation": {
                      "type": "TsTypeReference",
                      "span": {
                        "start": 501,
                        "end": 508,
                        "ctxt": 0
                      },
                      "typeName": {
                        "type": "Identifier",
                        "span": {
                          "start": 501,
                          "end": 508,
                          "ctxt": 0
                        },
                        "value": "Derived",
                        "optional": false
                      },
                      "typeParams": null
                    }
                  },
                  "readonly": false,
                  "static": false,
                  "span": {
                    "start": 488,
                    "end": 509,
                    "ctxt": 0
                  }
                }
              ]
            }
          },
          {
            "type": "FunctionDeclaration",
            "identifier": {
              "type": "Identifier",
              "span": {
                "start": 536,
                "end": 539,
                "ctxt": 0
              },
              "value": "foo",
              "optional": false
            },
            "declare": false,
            "params": [],
            "decorators": [],
            "span": {
              "start": 527,
              "end": 850,
              "ctxt": 0
            },
            "body": {
              "type": "BlockStatement",
              "span": {
                "start": 558,
                "end": 850,
                "ctxt": 0
              },
              "stmts": [
                {
                  "type": "VariableDeclaration",
                  "span": {
                    "start": 568,
                    "end": 580,
                    "ctxt": 0
                  },
                  "kind": "var",
                  "declare": false,
                  "declarations": [
                    {
                      "type": "VariableDeclarator",
                      "span": {
                        "start": 572,
                        "end": 579,
                        "ctxt": 0
                      },
                      "id": {
                        "type": "Identifier",
                        "span": {
                          "start": 572,
                          "end": 573,
                          "ctxt": 0
                        },
                        "value": "a",
                        "optional": false,
                        "typeAnnotation": {
                          "type": "TsTypeAnnotation",
                          "span": {
                            "start": 573,
                            "end": 579,
                            "ctxt": 0
                          },
                          "typeAnnotation": {
                            "type": "TsTypeReference",
                            "span": {
                              "start": 575,
                              "end": 579,
                              "ctxt": 0
                            },
                            "typeName": {
                              "type": "Identifier",
                              "span": {
                                "start": 575,
                                "end": 576,
                                "ctxt": 0
                              },
                              "value": "A",
                              "optional": false
                            },
                            "typeParams": {
                              "type": "TsTypeParameterInstantiation",
                              "span": {
                                "start": 576,
                                "end": 579,
                                "ctxt": 0
                              },
                              "params": [
                                {
                                  "type": "TsTypeReference",
                                  "span": {
                                    "start": 577,
                                    "end": 578,
                                    "ctxt": 0
                                  },
                                  "typeName": {
                                    "type": "Identifier",
                                    "span": {
                                      "start": 577,
                                      "end": 578,
                                      "ctxt": 0
                                    },
                                    "value": "T",
                                    "optional": false
                                  },
                                  "typeParams": null
                                }
                              ]
                            }
                          }
                        }
                      },
                      "init": null,
                      "definite": false
                    }
                  ]
                },
                {
                  "type": "VariableDeclaration",
                  "span": {
                    "start": 589,
                    "end": 621,
                    "ctxt": 0
                  },
                  "kind": "var",
                  "declare": false,
                  "declarations": [
                    {
                      "type": "VariableDeclarator",
                      "span": {
                        "start": 593,
                        "end": 621,
                        "ctxt": 0
                      },
                      "id": {
                        "type": "Identifier",
                        "span": {
                          "start": 593,
                          "end": 594,
                          "ctxt": 0
                        },
                        "value": "b",
                        "optional": false,
                        "typeAnnotation": {
                          "type": "TsTypeAnnotation",
                          "span": {
                            "start": 594,
                            "end": 621,
                            "ctxt": 0
                          },
                          "typeAnnotation": {
                            "type": "TsTypeLiteral",
                            "span": {
                              "start": 596,
                              "end": 621,
                              "ctxt": 0
                            },
                            "members": [
                              {
                                "type": "TsIndexSignature",
                                "params": [
                                  {
                                    "type": "Identifier",
                                    "span": {
                                      "start": 599,
                                      "end": 608,
                                      "ctxt": 0
                                    },
                                    "value": "x",
                                    "optional": false,
                                    "typeAnnotation": {
                                      "type": "TsTypeAnnotation",
                                      "span": {
                                        "start": 600,
                                        "end": 608,
                                        "ctxt": 0
                                      },
                                      "typeAnnotation": {
                                        "type": "TsKeywordType",
                                        "span": {
                                          "start": 602,
                                          "end": 608,
                                          "ctxt": 0
                                        },
                                        "kind": "number"
                                      }
                                    }
                                  }
                                ],
                                "typeAnnotation": {
                                  "type": "TsTypeAnnotation",
                                  "span": {
                                    "start": 609,
                                    "end": 618,
                                    "ctxt": 0
                                  },
                                  "typeAnnotation": {
                                    "type": "TsTypeReference",
                                    "span": {
                                      "start": 611,
                                      "end": 618,
                                      "ctxt": 0
                                    },
                                    "typeName": {
                                      "type": "Identifier",
                                      "span": {
                                        "start": 611,
                                        "end": 618,
                                        "ctxt": 0
                                      },
                                      "value": "Derived",
                                      "optional": false
                                    },
                                    "typeParams": null
                                  }
                                },
                                "readonly": false,
                                "static": false,
                                "span": {
                                  "start": 598,
                                  "end": 619,
                                  "ctxt": 0
                                }
                              }
                            ]
                          }
                        }
                      },
                      "init": null,
                      "definite": false
                    }
                  ]
                },
                {
                  "type": "ExpressionStatement",
                  "span": {
                    "start": 630,
                    "end": 636,
                    "ctxt": 0
                  },
                  "expression": {
                    "type": "AssignmentExpression",
                    "span": {
                      "start": 630,
                      "end": 635,
                      "ctxt": 0
                    },
                    "operator": "=",
                    "left": {
                      "type": "Identifier",
                      "span": {
                        "start": 630,
                        "end": 631,
                        "ctxt": 0
                      },
                      "value": "a",
                      "optional": false,
                      "typeAnnotation": null
                    },
                    "right": {
                      "type": "Identifier",
                      "span": {
                        "start": 634,
                        "end": 635,
                        "ctxt": 0
                      },
                      "value": "b",
                      "optional": false
                    }
                  }
                },
                {
                  "type": "ExpressionStatement",
                  "span": {
                    "start": 654,
                    "end": 660,
                    "ctxt": 0
                  },
                  "expression": {
                    "type": "AssignmentExpression",
                    "span": {
                      "start": 654,
                      "end": 659,
                      "ctxt": 0
                    },
                    "operator": "=",
                    "left": {
                      "type": "Identifier",
                      "span": {
                        "start": 654,
                        "end": 655,
                        "ctxt": 0
                      },
                      "value": "b",
                      "optional": false,
                      "typeAnnotation": null
                    },
                    "right": {
                      "type": "Identifier",
                      "span": {
                        "start": 658,
                        "end": 659,
                        "ctxt": 0
                      },
                      "value": "a",
                      "optional": false
                    }
                  }
                },
                {
                  "type": "VariableDeclaration",
                  "span": {
                    "start": 679,
                    "end": 713,
                    "ctxt": 0
                  },
                  "kind": "var",
                  "declare": false,
                  "declarations": [
                    {
                      "type": "VariableDeclarator",
                      "span": {
                        "start": 683,
                        "end": 713,
                        "ctxt": 0
                      },
                      "id": {
                        "type": "Identifier",
                        "span": {
                          "start": 683,
                          "end": 685,
                          "ctxt": 0
                        },
                        "value": "b2",
                        "optional": false,
                        "typeAnnotation": {
                          "type": "TsTypeAnnotation",
                          "span": {
                            "start": 685,
                            "end": 713,
                            "ctxt": 0
                          },
                          "typeAnnotation": {
                            "type": "TsTypeLiteral",
                            "span": {
                              "start": 687,
                              "end": 713,
                              "ctxt": 0
                            },
                            "members": [
                              {
                                "type": "TsIndexSignature",
                                "params": [
                                  {
                                    "type": "Identifier",
                                    "span": {
                                      "start": 690,
                                      "end": 699,
                                      "ctxt": 0
                                    },
                                    "value": "x",
                                    "optional": false,
                                    "typeAnnotation": {
                                      "type": "TsTypeAnnotation",
                                      "span": {
                                        "start": 691,
                                        "end": 699,
                                        "ctxt": 0
                                      },
                                      "typeAnnotation": {
                                        "type": "TsKeywordType",
                                        "span": {
                                          "start": 693,
                                          "end": 699,
                                          "ctxt": 0
                                        },
                                        "kind": "number"
                                      }
                                    }
                                  }
                                ],
                                "typeAnnotation": {
                                  "type": "TsTypeAnnotation",
                                  "span": {
                                    "start": 700,
                                    "end": 710,
                                    "ctxt": 0
                                  },
                                  "typeAnnotation": {
                                    "type": "TsTypeReference",
                                    "span": {
                                      "start": 702,
                                      "end": 710,
                                      "ctxt": 0
                                    },
                                    "typeName": {
                                      "type": "Identifier",
                                      "span": {
                                        "start": 702,
                                        "end": 710,
                                        "ctxt": 0
                                      },
                                      "value": "Derived2",
                                      "optional": false
                                    },
                                    "typeParams": null
                                  }
                                },
                                "readonly": false,
                                "static": false,
                                "span": {
                                  "start": 689,
                                  "end": 711,
                                  "ctxt": 0
                                }
                              }
                            ]
                          }
                        }
                      },
                      "init": null,
                      "definite": false
                    }
                  ]
                },
                {
                  "type": "ExpressionStatement",
                  "span": {
                    "start": 722,
                    "end": 729,
                    "ctxt": 0
                  },
                  "expression": {
                    "type": "AssignmentExpression",
                    "span": {
                      "start": 722,
                      "end": 728,
                      "ctxt": 0
                    },
                    "operator": "=",
                    "left": {
                      "type": "Identifier",
                      "span": {
                        "start": 722,
                        "end": 723,
                        "ctxt": 0
                      },
                      "value": "a",
                      "optional": false,
                      "typeAnnotation": null
                    },
                    "right": {
                      "type": "Identifier",
                      "span": {
                        "start": 726,
                        "end": 728,
                        "ctxt": 0
                      },
                      "value": "b2",
                      "optional": false
                    }
                  }
                },
                {
                  "type": "ExpressionStatement",
                  "span": {
                    "start": 747,
                    "end": 754,
                    "ctxt": 0
                  },
                  "expression": {
                    "type": "AssignmentExpression",
                    "span": {
                      "start": 747,
                      "end": 753,
                      "ctxt": 0
                    },
                    "operator": "=",
                    "left": {
                      "type": "Identifier",
                      "span": {
                        "start": 747,
                        "end": 749,
                        "ctxt": 0
                      },
                      "value": "b2",
                      "optional": false,
                      "typeAnnotation": null
                    },
                    "right": {
                      "type": "Identifier",
                      "span": {
                        "start": 752,
                        "end": 753,
                        "ctxt": 0
                      },
                      "value": "a",
                      "optional": false
                    }
                  }
                },
                {
                  "type": "VariableDeclaration",
                  "span": {
                    "start": 773,
                    "end": 800,
                    "ctxt": 0
                  },
                  "kind": "var",
                  "declare": false,
                  "declarations": [
                    {
                      "type": "VariableDeclarator",
                      "span": {
                        "start": 777,
                        "end": 800,
                        "ctxt": 0
                      },
                      "id": {
                        "type": "Identifier",
                        "span": {
                          "start": 777,
                          "end": 779,
                          "ctxt": 0
                        },
                        "value": "b3",
                        "optional": false,
                        "typeAnnotation": {
                          "type": "TsTypeAnnotation",
                          "span": {
                            "start": 779,
                            "end": 800,
                            "ctxt": 0
                          },
                          "typeAnnotation": {
                            "type": "TsTypeLiteral",
                            "span": {
                              "start": 781,
                              "end": 800,
                              "ctxt": 0
                            },
                            "members": [
                              {
                                "type": "TsIndexSignature",
                                "params": [
                                  {
                                    "type": "Identifier",
                                    "span": {
                                      "start": 784,
                                      "end": 793,
                                      "ctxt": 0
                                    },
                                    "value": "x",
                                    "optional": false,
                                    "typeAnnotation": {
                                      "type": "TsTypeAnnotation",
                                      "span": {
                                        "start": 785,
                                        "end": 793,
                                        "ctxt": 0
                                      },
                                      "typeAnnotation": {
                                        "type": "TsKeywordType",
                                        "span": {
                                          "start": 787,
                                          "end": 793,
                                          "ctxt": 0
                                        },
                                        "kind": "number"
                                      }
                                    }
                                  }
                                ],
                                "typeAnnotation": {
                                  "type": "TsTypeAnnotation",
                                  "span": {
                                    "start": 794,
                                    "end": 797,
                                    "ctxt": 0
                                  },
                                  "typeAnnotation": {
                                    "type": "TsTypeReference",
                                    "span": {
                                      "start": 796,
                                      "end": 797,
                                      "ctxt": 0
                                    },
                                    "typeName": {
                                      "type": "Identifier",
                                      "span": {
                                        "start": 796,
                                        "end": 797,
                                        "ctxt": 0
                                      },
                                      "value": "T",
                                      "optional": false
                                    },
                                    "typeParams": null
                                  }
                                },
                                "readonly": false,
                                "static": false,
                                "span": {
                                  "start": 783,
                                  "end": 798,
                                  "ctxt": 0
                                }
                              }
                            ]
                          }
                        }
                      },
                      "init": null,
                      "definite": false
                    }
                  ]
                },
                {
                  "type": "ExpressionStatement",
                  "span": {
                    "start": 809,
                    "end": 816,
                    "ctxt": 0
                  },
                  "expression": {
                    "type": "AssignmentExpression",
                    "span": {
                      "start": 809,
                      "end": 815,
                      "ctxt": 0
                    },
                    "operator": "=",
                    "left": {
                      "type": "Identifier",
                      "span": {
                        "start": 809,
                        "end": 810,
                        "ctxt": 0
                      },
                      "value": "a",
                      "optional": false,
                      "typeAnnotation": null
                    },
                    "right": {
                      "type": "Identifier",
                      "span": {
                        "start": 813,
                        "end": 815,
                        "ctxt": 0
                      },
                      "value": "b3",
                      "optional": false
                    }
                  }
                },
                {
                  "type": "ExpressionStatement",
                  "span": {
                    "start": 831,
                    "end": 838,
                    "ctxt": 0
                  },
                  "expression": {
                    "type": "AssignmentExpression",
                    "span": {
                      "start": 831,
                      "end": 837,
                      "ctxt": 0
                    },
                    "operator": "=",
                    "left": {
                      "type": "Identifier",
                      "span": {
                        "start": 831,
                        "end": 833,
                        "ctxt": 0
                      },
                      "value": "b3",
                      "optional": false,
                      "typeAnnotation": null
                    },
                    "right": {
                      "type": "Identifier",
                      "span": {
                        "start": 836,
                        "end": 837,
                        "ctxt": 0
                      },
                      "value": "a",
                      "optional": false
                    }
                  }
                }
              ]
            },
            "generator": false,
            "async": false,
            "typeParameters": {
              "type": "TsTypeParameterDeclaration",
              "span": {
                "start": 539,
                "end": 555,
                "ctxt": 0
              },
              "parameters": [
                {
                  "type": "TsTypeParameter",
                  "span": {
                    "start": 540,
                    "end": 554,
                    "ctxt": 0
                  },
                  "name": {
                    "type": "Identifier",
                    "span": {
                      "start": 540,
                      "end": 541,
                      "ctxt": 0
                    },
                    "value": "T",
                    "optional": false
                  },
                  "constraint": {
                    "type": "TsTypeReference",
                    "span": {
                      "start": 550,
                      "end": 554,
                      "ctxt": 0
                    },
                    "typeName": {
                      "type": "Identifier",
                      "span": {
                        "start": 550,
                        "end": 554,
                        "ctxt": 0
                      },
                      "value": "Base",
                      "optional": false
                    },
                    "typeParams": null
                  },
                  "default": null
                }
              ]
            },
            "returnType": null
          }
        ]
      }
    }
  ],
  "interpreter": null
}