bug: inherited index signatures not being reflected

[jordimarimon]

Prerequisites

• I have read the Contributing Guidelines.
• I have searched for existing issues that already report this problem, without success.

Version

N/A

Current Behavior

If an interface A inherits another interface B where the last one has an index signature defined, the reflected interface A doesn't include the index signature defined in the interface B.

Expected Behavior

Inherited index signature should appear in the reflected output

Steps to Reproduce

Sample code:

export interface Foo<T> {
    [index: number]: T;
    field: T;
    method: (a: T) => T;
}

export interface Bar extends Foo<string> {
    childField: number;
}

Sample output:

{
  "name": "Bar",
  "kind": "interface",
  "heritage": [
    {
      "name": "Foo<string>",
      "href": {
        "path": "..."
      },
      "kind": "interface"
    }
  ],
  "members": [
    {
      "name": "field",
      "kind": "field",
      "type": {
        "text": "string"
      },
      "inheritedFrom": "Foo<string>"
    },
    {
      "name": "method",
      "return": {
        "type": {
          "text": "string"
        }
      },
      "parameters": [
        {
          "name": "a",
          "type": {
            "text": "string"
          }
        }
      ],
      "kind": "method",
      "inheritedFrom": "Foo<string>"
    },
    {
      "name": "childField",
      "kind": "field",
      "type": {
        "text": "number"
      }
    }
  ]
}

Code Reproduction URL

No response

Additional Information

No response