Incorrect output of Record with numeric key

[matt-pawley]

A Record with a numeric key is incorrectly outputted as an array instead of an object.

// foo.ts

interface RecordValue {
  baz: 'baz';
}

export type Foo = Record<number, RecordValue>;

// Note, the following output as expected:

// export type Foo = Record<string, RecordValue>;

// export type Foo = {
//   [key: number]: RecordValue;
// };

Command:

ts-json-schema-generator --path 'foo.ts'

Actual Result:

{
  "$ref": "#/definitions/Foo",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "definitions": {
    "Foo": {
      "items": {
        "additionalProperties": false,
        "properties": {
          "baz": {
            "const": "baz",
            "type": "string"
          }
        },
        "required": [
          "baz"
        ],
        "type": "object"
      },
      "type": "array"
    }
  }
}

Expected Result:

{
  "$ref": "#/definitions/Foo",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "definitions": {
    "Foo": {
      "additionalProperties": {
        "additionalProperties": false,
        "properties": {
          "baz": {
            "const": "baz",
            "type": "string"
          }
        },
        "required": [
          "baz"
        ],
        "type": "object"
      },
      "type": "object"
    }
  }
}

Fully appreciate all object keys are strings in Javascript, so declaring a Record with a numeric interface is unusual. However. typescript allows it, so would be useful for ts-json-schema-generator to also support it.

[matt-pawley]

Found the issue is in MappedTypeNodeParser - https://github.com/vega/ts-json-schema-generator/blob/next/src/NodeParser/MappedTypeNodeParser.ts#L57-L59

If we move keyListType instanceof NumberType into the above if statement, it works as expected. However this breaks https://github.com/vega/ts-json-schema-generator/blob/next/test/valid-data/type-mapped-array/main.ts

[matt-pawley]

Fixed in v1.1.0