Default type arguments should be omitted from documentation

[hoodmane]

Expected Behavior

If a type has a type argument and we use the default value for it, the type argument should not appear in the documentation.

Actual Behavior

Sometimes the type argument appears, sometimes it doesn't. It seems that Iterator<number> as a return type is rendered as Iterator<number> but as a parameter type is rendered as Iterator<number, any, undefined>.

Steps to reproduce the bug

I use Uint8Array for the repro because it is always present independent of the "lib" compiler option. Uint8Array just gained a type parameter in typescript 5.7 so this particular reproducer doesn't work in prior versions but it will reproduce with Iterator.

npm i typedoc@0.27 typescript@5.7
cat << 'END' > a.ts
export function f(a: Uint8Array): Uint8Array {
    return a;
}
END
npx typedoc a.ts

Output looks like:

Environment

• Typedoc version: 0.27.5
• TypeScript version: 5.7.1
• Node.js version: 22.12
• OS: ubuntu 22.04

[hoodmane]

Thanks for the fast fix @Gerrit0!