Hello,

I am experiencing an issue with Compodoc (version 1.1.25) when using indexed access types (also known as lookup types) in TypeScript, specifically when referencing a property of another type or interface using the T[K] syntax.

Example Code

Here is a TypeScript code example that causes this problem:

interface Person {
  name: string;
  age: number;
  phone: number | string;
  email: string;
}

interface ContactInfo {
  phone: Person['phone'];  
  years: Person['age']; 
}

Observed Behavior

When running Compodoc, the types defined using the T[K] syntax are not correctly interpreted or documented. They are not displayed correctly in the generated documentation and empty in JSON export.

Expected Behavior

I would expect Compodoc to recognize and correctly document the types obtained via the [] operator, specifying the exact type (string, number, etc.) instead of an empty result.

Environment Details

• Compodoc Version: 1.1.25

Thank you for looking into this issue!