Preserve typedef comments in declaration emit

[Copilot]

JSDoc descriptions preceding @typedef were not attached to the emitted declaration type. The full source JSDoc block could instead be emitted separately after the generated type.

• Declaration emit

  • Preserve the descriptive portion of converted JSDoc typedef/callback comments on reparsed type aliases.
  • Avoid re-emitting converted @typedef/@callback source comments as standalone declaration trivia.

• Baselines

  • Added regression coverage for typedef description emit.
  • Updated declaration baselines where converted JSDoc blocks are no longer duplicated.

Example output now matches the intended declaration shape:

/**
 * Comment on the `Foo` type
 */
export type Foo = {
    /**
     * Whether `.bool` is true or not
     */
    bool: boolean;
};

[hkleungai]

Looks like this diff should not go away?

[hkleungai]

Now I am a bit confused..

Which actually counts as the comment for the generated type? The one on top of typedef, or the one follows right after the jsdoc declaration? Or both? Any precedence?

It worths to check how TS 6 behaves in all these cases. 🤔