{
  "type": "Script",
  "span": {
    "start": 62,
    "end": 883,
    "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": 236,
        "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": 236,
          "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": 233,
                "ctxt": 0
              },
              "typeAnnotation": {
                "type": "TsTypeReference",
                "span": {
                  "start": 226,
                  "end": 233,
                  "ctxt": 0
                },
                "typeName": {
                  "type": "Identifier",
                  "span": {
                    "start": 226,
                    "end": 233,
                    "ctxt": 0
                  },
                  "value": "Derived",
                  "optional": false
                },
                "typeParams": null
              }
            },
            "readonly": false,
            "static": false,
            "span": {
              "start": 213,
              "end": 234,
              "ctxt": 0
            }
          }
        ]
      }
    },
    {
      "type": "ClassDeclaration",
      "identifier": {
        "type": "Identifier",
        "span": {
          "start": 244,
          "end": 245,
          "ctxt": 0
        },
        "value": "B",
        "optional": false
      },
      "declare": false,
      "span": {
        "start": 238,
        "end": 294,
        "ctxt": 0
      },
      "decorators": [],
      "body": [
        {
          "type": "TsIndexSignature",
          "params": [
            {
              "type": "Identifier",
              "span": {
                "start": 266,
                "end": 275,
                "ctxt": 0
              },
              "value": "x",
              "optional": false,
              "typeAnnotation": {
                "type": "TsTypeAnnotation",
                "span": {
                  "start": 267,
                  "end": 275,
                  "ctxt": 0
                },
                "typeAnnotation": {
                  "type": "TsKeywordType",
                  "span": {
                    "start": 269,
                    "end": 275,
                    "ctxt": 0
                  },
                  "kind": "string"
                }
              }
            }
          ],
          "typeAnnotation": {
            "type": "TsTypeAnnotation",
            "span": {
              "start": 276,
              "end": 282,
              "ctxt": 0
            },
            "typeAnnotation": {
              "type": "TsTypeReference",
              "span": {
                "start": 278,
                "end": 282,
                "ctxt": 0
              },
              "typeName": {
                "type": "Identifier",
                "span": {
                  "start": 278,
                  "end": 282,
                  "ctxt": 0
                },
                "value": "Base",
                "optional": false
              },
              "typeParams": null
            }
          },
          "readonly": false,
          "static": false,
          "span": {
            "start": 265,
            "end": 283,
            "ctxt": 0
          }
        }
      ],
      "superClass": null,
      "isAbstract": false,
      "typeParams": null,
      "superTypeParams": null,
      "implements": [
        {
          "type": "TsExpressionWithTypeArguments",
          "span": {
            "start": 257,
            "end": 258,
            "ctxt": 0
          },
          "expression": {
            "type": "Identifier",
            "span": {
              "start": 257,
              "end": 258,
              "ctxt": 0
            },
            "value": "A",
            "optional": false
          },
          "typeArguments": null
        }
      ]
    },
    {
      "type": "ClassDeclaration",
      "identifier": {
        "type": "Identifier",
        "span": {
          "start": 302,
          "end": 304,
          "ctxt": 0
        },
        "value": "B2",
        "optional": false
      },
      "declare": false,
      "span": {
        "start": 296,
        "end": 354,
        "ctxt": 0
      },
      "decorators": [],
      "body": [
        {
          "type": "TsIndexSignature",
          "params": [
            {
              "type": "Identifier",
              "span": {
                "start": 325,
                "end": 334,
                "ctxt": 0
              },
              "value": "x",
              "optional": false,
              "typeAnnotation": {
                "type": "TsTypeAnnotation",
                "span": {
                  "start": 326,
                  "end": 334,
                  "ctxt": 0
                },
                "typeAnnotation": {
                  "type": "TsKeywordType",
                  "span": {
                    "start": 328,
                    "end": 334,
                    "ctxt": 0
                  },
                  "kind": "string"
                }
              }
            }
          ],
          "typeAnnotation": {
            "type": "TsTypeAnnotation",
            "span": {
              "start": 335,
              "end": 345,
              "ctxt": 0
            },
            "typeAnnotation": {
              "type": "TsTypeReference",
              "span": {
                "start": 337,
                "end": 345,
                "ctxt": 0
              },
              "typeName": {
                "type": "Identifier",
                "span": {
                  "start": 337,
                  "end": 345,
                  "ctxt": 0
                },
                "value": "Derived2",
                "optional": false
              },
              "typeParams": null
            }
          },
          "readonly": false,
          "static": false,
          "span": {
            "start": 324,
            "end": 346,
            "ctxt": 0
          }
        }
      ],
      "superClass": null,
      "isAbstract": false,
      "typeParams": null,
      "superTypeParams": null,
      "implements": [
        {
          "type": "TsExpressionWithTypeArguments",
          "span": {
            "start": 316,
            "end": 317,
            "ctxt": 0
          },
          "expression": {
            "type": "Identifier",
            "span": {
              "start": 316,
              "end": 317,
              "ctxt": 0
            },
            "value": "A",
            "optional": false
          },
          "typeArguments": null
        }
      ]
    },
    {
      "type": "TsModuleDeclaration",
      "span": {
        "start": 356,
        "end": 883,
        "ctxt": 0
      },
      "declare": false,
      "global": false,
      "id": {
        "type": "Identifier",
        "span": {
          "start": 363,
          "end": 371,
          "ctxt": 0
        },
        "value": "Generics",
        "optional": false
      },
      "body": {
        "type": "TsModuleBlock",
        "span": {
          "start": 372,
          "end": 883,
          "ctxt": 0
        },
        "body": [
          {
            "type": "TsInterfaceDeclaration",
            "span": {
              "start": 378,
              "end": 437,
              "ctxt": 0
            },
            "id": {
              "type": "Identifier",
              "span": {
                "start": 388,
                "end": 389,
                "ctxt": 0
              },
              "value": "A",
              "optional": false
            },
            "declare": false,
            "typeParams": {
              "type": "TsTypeParameterDeclaration",
              "span": {
                "start": 389,
                "end": 405,
                "ctxt": 0
              },
              "parameters": [
                {
                  "type": "TsTypeParameter",
                  "span": {
                    "start": 390,
                    "end": 404,
                    "ctxt": 0
                  },
                  "name": {
                    "type": "Identifier",
                    "span": {
                      "start": 390,
                      "end": 391,
                      "ctxt": 0
                    },
                    "value": "T",
                    "optional": false
                  },
                  "in": false,
                  "out": false,
                  "constraint": {
                    "type": "TsTypeReference",
                    "span": {
                      "start": 400,
                      "end": 404,
                      "ctxt": 0
                    },
                    "typeName": {
                      "type": "Identifier",
                      "span": {
                        "start": 400,
                        "end": 404,
                        "ctxt": 0
                      },
                      "value": "Base",
                      "optional": false
                    },
                    "typeParams": null
                  },
                  "default": null
                }
              ]
            },
            "extends": [],
            "body": {
              "type": "TsInterfaceBody",
              "span": {
                "start": 406,
                "end": 437,
                "ctxt": 0
              },
              "body": [
                {
                  "type": "TsIndexSignature",
                  "params": [
                    {
                      "type": "Identifier",
                      "span": {
                        "start": 417,
                        "end": 426,
                        "ctxt": 0
                      },
                      "value": "x",
                      "optional": false,
                      "typeAnnotation": {
                        "type": "TsTypeAnnotation",
                        "span": {
                          "start": 418,
                          "end": 426,
                          "ctxt": 0
                        },
                        "typeAnnotation": {
                          "type": "TsKeywordType",
                          "span": {
                            "start": 420,
                            "end": 426,
                            "ctxt": 0
                          },
                          "kind": "number"
                        }
                      }
                    }
                  ],
                  "typeAnnotation": {
                    "type": "TsTypeAnnotation",
                    "span": {
                      "start": 427,
                      "end": 430,
                      "ctxt": 0
                    },
                    "typeAnnotation": {
                      "type": "TsTypeReference",
                      "span": {
                        "start": 429,
                        "end": 430,
                        "ctxt": 0
                      },
                      "typeName": {
                        "type": "Identifier",
                        "span": {
                          "start": 429,
                          "end": 430,
                          "ctxt": 0
                        },
                        "value": "T",
                        "optional": false
                      },
                      "typeParams": null
                    }
                  },
                  "readonly": false,
                  "static": false,
                  "span": {
                    "start": 416,
                    "end": 431,
                    "ctxt": 0
                  }
                }
              ]
            }
          },
          {
            "type": "ClassDeclaration",
            "identifier": {
              "type": "Identifier",
              "span": {
                "start": 449,
                "end": 450,
                "ctxt": 0
              },
              "value": "B",
              "optional": false
            },
            "declare": false,
            "span": {
              "start": 443,
              "end": 513,
              "ctxt": 0
            },
            "decorators": [],
            "body": [
              {
                "type": "TsIndexSignature",
                "params": [
                  {
                    "type": "Identifier",
                    "span": {
                      "start": 481,
                      "end": 490,
                      "ctxt": 0
                    },
                    "value": "x",
                    "optional": false,
                    "typeAnnotation": {
                      "type": "TsTypeAnnotation",
                      "span": {
                        "start": 482,
                        "end": 490,
                        "ctxt": 0
                      },
                      "typeAnnotation": {
                        "type": "TsKeywordType",
                        "span": {
                          "start": 484,
                          "end": 490,
                          "ctxt": 0
                        },
                        "kind": "string"
                      }
                    }
                  }
                ],
                "typeAnnotation": {
                  "type": "TsTypeAnnotation",
                  "span": {
                    "start": 491,
                    "end": 500,
                    "ctxt": 0
                  },
                  "typeAnnotation": {
                    "type": "TsTypeReference",
                    "span": {
                      "start": 493,
                      "end": 500,
                      "ctxt": 0
                    },
                    "typeName": {
                      "type": "Identifier",
                      "span": {
                        "start": 493,
                        "end": 500,
                        "ctxt": 0
                      },
                      "value": "Derived",
                      "optional": false
                    },
                    "typeParams": null
                  }
                },
                "readonly": false,
                "static": false,
                "span": {
                  "start": 480,
                  "end": 501,
                  "ctxt": 0
                }
              }
            ],
            "superClass": null,
            "isAbstract": false,
            "typeParams": null,
            "superTypeParams": null,
            "implements": [
              {
                "type": "TsExpressionWithTypeArguments",
                "span": {
                  "start": 462,
                  "end": 469,
                  "ctxt": 0
                },
                "expression": {
                  "type": "Identifier",
                  "span": {
                    "start": 462,
                    "end": 463,
                    "ctxt": 0
                  },
                  "value": "A",
                  "optional": false
                },
                "typeArguments": {
                  "type": "TsTypeParameterInstantiation",
                  "span": {
                    "start": 463,
                    "end": 469,
                    "ctxt": 0
                  },
                  "params": [
                    {
                      "type": "TsTypeReference",
                      "span": {
                        "start": 464,
                        "end": 468,
                        "ctxt": 0
                      },
                      "typeName": {
                        "type": "Identifier",
                        "span": {
                          "start": 464,
                          "end": 468,
                          "ctxt": 0
                        },
                        "value": "Base",
                        "optional": false
                      },
                      "typeParams": null
                    }
                  ]
                }
              }
            ]
          },
          {
            "type": "ClassDeclaration",
            "identifier": {
              "type": "Identifier",
              "span": {
                "start": 525,
                "end": 527,
                "ctxt": 0
              },
              "value": "B2",
              "optional": false
            },
            "declare": false,
            "span": {
              "start": 519,
              "end": 594,
              "ctxt": 0
            },
            "decorators": [],
            "body": [
              {
                "type": "TsIndexSignature",
                "params": [
                  {
                    "type": "Identifier",
                    "span": {
                      "start": 561,
                      "end": 570,
                      "ctxt": 0
                    },
                    "value": "x",
                    "optional": false,
                    "typeAnnotation": {
                      "type": "TsTypeAnnotation",
                      "span": {
                        "start": 562,
                        "end": 570,
                        "ctxt": 0
                      },
                      "typeAnnotation": {
                        "type": "TsKeywordType",
                        "span": {
                          "start": 564,
                          "end": 570,
                          "ctxt": 0
                        },
                        "kind": "string"
                      }
                    }
                  }
                ],
                "typeAnnotation": {
                  "type": "TsTypeAnnotation",
                  "span": {
                    "start": 571,
                    "end": 581,
                    "ctxt": 0
                  },
                  "typeAnnotation": {
                    "type": "TsTypeReference",
                    "span": {
                      "start": 573,
                      "end": 581,
                      "ctxt": 0
                    },
                    "typeName": {
                      "type": "Identifier",
                      "span": {
                        "start": 573,
                        "end": 581,
                        "ctxt": 0
                      },
                      "value": "Derived2",
                      "optional": false
                    },
                    "typeParams": null
                  }
                },
                "readonly": false,
                "static": false,
                "span": {
                  "start": 560,
                  "end": 582,
                  "ctxt": 0
                }
              }
            ],
            "superClass": null,
            "isAbstract": false,
            "typeParams": null,
            "superTypeParams": null,
            "implements": [
              {
                "type": "TsExpressionWithTypeArguments",
                "span": {
                  "start": 539,
                  "end": 549,
                  "ctxt": 0
                },
                "expression": {
                  "type": "Identifier",
                  "span": {
                    "start": 539,
                    "end": 540,
                    "ctxt": 0
                  },
                  "value": "A",
                  "optional": false
                },
                "typeArguments": {
                  "type": "TsTypeParameterInstantiation",
                  "span": {
                    "start": 540,
                    "end": 549,
                    "ctxt": 0
                  },
                  "params": [
                    {
                      "type": "TsTypeReference",
                      "span": {
                        "start": 541,
                        "end": 548,
                        "ctxt": 0
                      },
                      "typeName": {
                        "type": "Identifier",
                        "span": {
                          "start": 541,
                          "end": 548,
                          "ctxt": 0
                        },
                        "value": "Derived",
                        "optional": false
                      },
                      "typeParams": null
                    }
                  ]
                }
              }
            ]
          },
          {
            "type": "ClassDeclaration",
            "identifier": {
              "type": "Identifier",
              "span": {
                "start": 606,
                "end": 608,
                "ctxt": 0
              },
              "value": "B3",
              "optional": false
            },
            "declare": false,
            "span": {
              "start": 600,
              "end": 687,
              "ctxt": 0
            },
            "decorators": [],
            "body": [
              {
                "type": "TsIndexSignature",
                "params": [
                  {
                    "type": "Identifier",
                    "span": {
                      "start": 655,
                      "end": 664,
                      "ctxt": 0
                    },
                    "value": "x",
                    "optional": false,
                    "typeAnnotation": {
                      "type": "TsTypeAnnotation",
                      "span": {
                        "start": 656,
                        "end": 664,
                        "ctxt": 0
                      },
                      "typeAnnotation": {
                        "type": "TsKeywordType",
                        "span": {
                          "start": 658,
                          "end": 664,
                          "ctxt": 0
                        },
                        "kind": "string"
                      }
                    }
                  }
                ],
                "typeAnnotation": {
                  "type": "TsTypeAnnotation",
                  "span": {
                    "start": 665,
                    "end": 671,
                    "ctxt": 0
                  },
                  "typeAnnotation": {
                    "type": "TsTypeReference",
                    "span": {
                      "start": 667,
                      "end": 671,
                      "ctxt": 0
                    },
                    "typeName": {
                      "type": "Identifier",
                      "span": {
                        "start": 667,
                        "end": 671,
                        "ctxt": 0
                      },
                      "value": "Base",
                      "optional": false
                    },
                    "typeParams": null
                  }
                },
                "readonly": false,
                "static": false,
                "span": {
                  "start": 654,
                  "end": 672,
                  "ctxt": 0
                }
              }
            ],
            "superClass": null,
            "isAbstract": false,
            "typeParams": {
              "type": "TsTypeParameterDeclaration",
              "span": {
                "start": 608,
                "end": 627,
                "ctxt": 0
              },
              "parameters": [
                {
                  "type": "TsTypeParameter",
                  "span": {
                    "start": 609,
                    "end": 626,
                    "ctxt": 0
                  },
                  "name": {
                    "type": "Identifier",
                    "span": {
                      "start": 609,
                      "end": 610,
                      "ctxt": 0
                    },
                    "value": "T",
                    "optional": false
                  },
                  "in": false,
                  "out": false,
                  "constraint": {
                    "type": "TsTypeReference",
                    "span": {
                      "start": 619,
                      "end": 626,
                      "ctxt": 0
                    },
                    "typeName": {
                      "type": "Identifier",
                      "span": {
                        "start": 619,
                        "end": 626,
                        "ctxt": 0
                      },
                      "value": "Derived",
                      "optional": false
                    },
                    "typeParams": null
                  },
                  "default": null
                }
              ]
            },
            "superTypeParams": null,
            "implements": [
              {
                "type": "TsExpressionWithTypeArguments",
                "span": {
                  "start": 639,
                  "end": 643,
                  "ctxt": 0
                },
                "expression": {
                  "type": "Identifier",
                  "span": {
                    "start": 639,
                    "end": 640,
                    "ctxt": 0
                  },
                  "value": "A",
                  "optional": false
                },
                "typeArguments": {
                  "type": "TsTypeParameterInstantiation",
                  "span": {
                    "start": 640,
                    "end": 643,
                    "ctxt": 0
                  },
                  "params": [
                    {
                      "type": "TsTypeReference",
                      "span": {
                        "start": 641,
                        "end": 642,
                        "ctxt": 0
                      },
                      "typeName": {
                        "type": "Identifier",
                        "span": {
                          "start": 641,
                          "end": 642,
                          "ctxt": 0
                        },
                        "value": "T",
                        "optional": false
                      },
                      "typeParams": null
                    }
                  ]
                }
              }
            ]
          },
          {
            "type": "ClassDeclaration",
            "identifier": {
              "type": "Identifier",
              "span": {
                "start": 699,
                "end": 701,
                "ctxt": 0
              },
              "value": "B4",
              "optional": false
            },
            "declare": false,
            "span": {
              "start": 693,
              "end": 783,
              "ctxt": 0
            },
            "decorators": [],
            "body": [
              {
                "type": "TsIndexSignature",
                "params": [
                  {
                    "type": "Identifier",
                    "span": {
                      "start": 748,
                      "end": 757,
                      "ctxt": 0
                    },
                    "value": "x",
                    "optional": false,
                    "typeAnnotation": {
                      "type": "TsTypeAnnotation",
                      "span": {
                        "start": 749,
                        "end": 757,
                        "ctxt": 0
                      },
                      "typeAnnotation": {
                        "type": "TsKeywordType",
                        "span": {
                          "start": 751,
                          "end": 757,
                          "ctxt": 0
                        },
                        "kind": "string"
                      }
                    }
                  }
                ],
                "typeAnnotation": {
                  "type": "TsTypeAnnotation",
                  "span": {
                    "start": 758,
                    "end": 767,
                    "ctxt": 0
                  },
                  "typeAnnotation": {
                    "type": "TsTypeReference",
                    "span": {
                      "start": 760,
                      "end": 767,
                      "ctxt": 0
                    },
                    "typeName": {
                      "type": "Identifier",
                      "span": {
                        "start": 760,
                        "end": 767,
                        "ctxt": 0
                      },
                      "value": "Derived",
                      "optional": false
                    },
                    "typeParams": null
                  }
                },
                "readonly": false,
                "static": false,
                "span": {
                  "start": 747,
                  "end": 768,
                  "ctxt": 0
                }
              }
            ],
            "superClass": null,
            "isAbstract": false,
            "typeParams": {
              "type": "TsTypeParameterDeclaration",
              "span": {
                "start": 701,
                "end": 720,
                "ctxt": 0
              },
              "parameters": [
                {
                  "type": "TsTypeParameter",
                  "span": {
                    "start": 702,
                    "end": 719,
                    "ctxt": 0
                  },
                  "name": {
                    "type": "Identifier",
                    "span": {
                      "start": 702,
                      "end": 703,
                      "ctxt": 0
                    },
                    "value": "T",
                    "optional": false
                  },
                  "in": false,
                  "out": false,
                  "constraint": {
                    "type": "TsTypeReference",
                    "span": {
                      "start": 712,
                      "end": 719,
                      "ctxt": 0
                    },
                    "typeName": {
                      "type": "Identifier",
                      "span": {
                        "start": 712,
                        "end": 719,
                        "ctxt": 0
                      },
                      "value": "Derived",
                      "optional": false
                    },
                    "typeParams": null
                  },
                  "default": null
                }
              ]
            },
            "superTypeParams": null,
            "implements": [
              {
                "type": "TsExpressionWithTypeArguments",
                "span": {
                  "start": 732,
                  "end": 736,
                  "ctxt": 0
                },
                "expression": {
                  "type": "Identifier",
                  "span": {
                    "start": 732,
                    "end": 733,
                    "ctxt": 0
                  },
                  "value": "A",
                  "optional": false
                },
                "typeArguments": {
                  "type": "TsTypeParameterInstantiation",
                  "span": {
                    "start": 733,
                    "end": 736,
                    "ctxt": 0
                  },
                  "params": [
                    {
                      "type": "TsTypeReference",
                      "span": {
                        "start": 734,
                        "end": 735,
                        "ctxt": 0
                      },
                      "typeName": {
                        "type": "Identifier",
                        "span": {
                          "start": 734,
                          "end": 735,
                          "ctxt": 0
                        },
                        "value": "T",
                        "optional": false
                      },
                      "typeParams": null
                    }
                  ]
                }
              }
            ]
          },
          {
            "type": "ClassDeclaration",
            "identifier": {
              "type": "Identifier",
              "span": {
                "start": 795,
                "end": 797,
                "ctxt": 0
              },
              "value": "B5",
              "optional": false
            },
            "declare": false,
            "span": {
              "start": 789,
              "end": 881,
              "ctxt": 0
            },
            "decorators": [],
            "body": [
              {
                "type": "TsIndexSignature",
                "params": [
                  {
                    "type": "Identifier",
                    "span": {
                      "start": 845,
                      "end": 854,
                      "ctxt": 0
                    },
                    "value": "x",
                    "optional": false,
                    "typeAnnotation": {
                      "type": "TsTypeAnnotation",
                      "span": {
                        "start": 846,
                        "end": 854,
                        "ctxt": 0
                      },
                      "typeAnnotation": {
                        "type": "TsKeywordType",
                        "span": {
                          "start": 848,
                          "end": 854,
                          "ctxt": 0
                        },
                        "kind": "string"
                      }
                    }
                  }
                ],
                "typeAnnotation": {
                  "type": "TsTypeAnnotation",
                  "span": {
                    "start": 855,
                    "end": 865,
                    "ctxt": 0
                  },
                  "typeAnnotation": {
                    "type": "TsTypeReference",
                    "span": {
                      "start": 857,
                      "end": 865,
                      "ctxt": 0
                    },
                    "typeName": {
                      "type": "Identifier",
                      "span": {
                        "start": 857,
                        "end": 865,
                        "ctxt": 0
                      },
                      "value": "Derived2",
                      "optional": false
                    },
                    "typeParams": null
                  }
                },
                "readonly": false,
                "static": false,
                "span": {
                  "start": 844,
                  "end": 866,
                  "ctxt": 0
                }
              }
            ],
            "superClass": null,
            "isAbstract": false,
            "typeParams": {
              "type": "TsTypeParameterDeclaration",
              "span": {
                "start": 797,
                "end": 817,
                "ctxt": 0
              },
              "parameters": [
                {
                  "type": "TsTypeParameter",
                  "span": {
                    "start": 798,
                    "end": 816,
                    "ctxt": 0
                  },
                  "name": {
                    "type": "Identifier",
                    "span": {
                      "start": 798,
                      "end": 799,
                      "ctxt": 0
                    },
                    "value": "T",
                    "optional": false
                  },
                  "in": false,
                  "out": false,
                  "constraint": {
                    "type": "TsTypeReference",
                    "span": {
                      "start": 808,
                      "end": 816,
                      "ctxt": 0
                    },
                    "typeName": {
                      "type": "Identifier",
                      "span": {
                        "start": 808,
                        "end": 816,
                        "ctxt": 0
                      },
                      "value": "Derived2",
                      "optional": false
                    },
                    "typeParams": null
                  },
                  "default": null
                }
              ]
            },
            "superTypeParams": null,
            "implements": [
              {
                "type": "TsExpressionWithTypeArguments",
                "span": {
                  "start": 829,
                  "end": 833,
                  "ctxt": 0
                },
                "expression": {
                  "type": "Identifier",
                  "span": {
                    "start": 829,
                    "end": 830,
                    "ctxt": 0
                  },
                  "value": "A",
                  "optional": false
                },
                "typeArguments": {
                  "type": "TsTypeParameterInstantiation",
                  "span": {
                    "start": 830,
                    "end": 833,
                    "ctxt": 0
                  },
                  "params": [
                    {
                      "type": "TsTypeReference",
                      "span": {
                        "start": 831,
                        "end": 832,
                        "ctxt": 0
                      },
                      "typeName": {
                        "type": "Identifier",
                        "span": {
                          "start": 831,
                          "end": 832,
                          "ctxt": 0
                        },
                        "value": "T",
                        "optional": false
                      },
                      "typeParams": null
                    }
                  ]
                }
              }
            ]
          }
        ]
      }
    }
  ],
  "interpreter": null
}