{
  "type": "Program",
  "statements": [
    {
      "type": "VariableDeclaration",
      "declarations": [
        {
          "type": "VariableDeclarator",
          "id": {
            "type": "Identifier",
            "name": "a",
            "typeAnnotation": {
              "type": "TSTypeLiteral",
              "members": [
                {
                  "type": "TSIndexSignature",
                  "parameters": {
                    "type": "Identifier",
                    "name": "a",
                    "typeAnnotation": {
                      "type": "TSNumberKeyword",
                      "loc": {
                        "start": {
                          "line": 1,
                          "column": 21
                        },
                        "end": {
                          "line": 1,
                          "column": 27
                        }
                      }
                    },
                    "decorators": [],
                    "loc": {
                      "start": {
                        "line": 1,
                        "column": 19
                      },
                      "end": {
                        "line": 1,
                        "column": 20
                      }
                    }
                  },
                  "typeAnnotation": {
                    "type": "TSNumberKeyword",
                    "loc": {
                      "start": {
                        "line": 1,
                        "column": 29
                      },
                      "end": {
                        "line": 1,
                        "column": 35
                      }
                    }
                  },
                  "readonly": true,
                  "loc": {
                    "start": {
                      "line": 1,
                      "column": 9
                    },
                    "end": {
                      "line": 1,
                      "column": 36
                    }
                  }
                },
                {
                  "type": "TSIndexSignature",
                  "parameters": {
                    "type": "Identifier",
                    "name": "b",
                    "typeAnnotation": {
                      "type": "TSStringKeyword",
                      "loc": {
                        "start": {
                          "line": 1,
                          "column": 40
                        },
                        "end": {
                          "line": 1,
                          "column": 46
                        }
                      }
                    },
                    "decorators": [],
                    "loc": {
                      "start": {
                        "line": 1,
                        "column": 38
                      },
                      "end": {
                        "line": 1,
                        "column": 39
                      }
                    }
                  },
                  "typeAnnotation": {
                    "type": "TSNumberKeyword",
                    "loc": {
                      "start": {
                        "line": 1,
                        "column": 48
                      },
                      "end": {
                        "line": 1,
                        "column": 54
                      }
                    }
                  },
                  "readonly": false,
                  "loc": {
                    "start": {
                      "line": 1,
                      "column": 37
                    },
                    "end": {
                      "line": 1,
                      "column": 55
                    }
                  }
                }
              ],
              "loc": {
                "start": {
                  "line": 1,
                  "column": 8
                },
                "end": {
                  "line": 1,
                  "column": 55
                }
              }
            },
            "decorators": [],
            "loc": {
              "start": {
                "line": 1,
                "column": 5
              },
              "end": {
                "line": 1,
                "column": 6
              }
            }
          },
          "init": null,
          "loc": {
            "start": {
              "line": 1,
              "column": 5
            },
            "end": {
              "line": 1,
              "column": 6
            }
          }
        }
      ],
      "kind": "var",
      "loc": {
        "start": {
          "line": 1,
          "column": 1
        },
        "end": {
          "line": 1,
          "column": 56
        }
      }
    },
    {
      "type": "ExpressionStatement",
      "expression": {
        "type": "AssignmentExpression",
        "operator": "=",
        "left": {
          "type": "MemberExpression",
          "object": {
            "type": "Identifier",
            "name": "a",
            "decorators": [],
            "loc": {
              "start": {
                "line": 2,
                "column": 1
              },
              "end": {
                "line": 2,
                "column": 2
              }
            }
          },
          "property": {
            "type": "NumberLiteral",
            "value": 5,
            "loc": {
              "start": {
                "line": 2,
                "column": 3
              },
              "end": {
                "line": 2,
                "column": 4
              }
            }
          },
          "computed": true,
          "optional": false,
          "loc": {
            "start": {
              "line": 2,
              "column": 1
            },
            "end": {
              "line": 2,
              "column": 5
            }
          }
        },
        "right": {
          "type": "NumberLiteral",
          "value": 5,
          "loc": {
            "start": {
              "line": 2,
              "column": 8
            },
            "end": {
              "line": 2,
              "column": 9
            }
          }
        },
        "loc": {
          "start": {
            "line": 2,
            "column": 1
          },
          "end": {
            "line": 2,
            "column": 9
          }
        }
      },
      "loc": {
        "start": {
          "line": 2,
          "column": 1
        },
        "end": {
          "line": 2,
          "column": 10
        }
      }
    }
  ],
  "loc": {
    "start": {
      "line": 1,
      "column": 1
    },
    "end": {
      "line": 3,
      "column": 1
    }
  }
}
TypeError: Index signature in type '{ [b: string]: number; readonly [a: number]: number; }' only permits reading. [member_expression_70.ts:2:1]
