JSDoc tooltip for function type

Suggestion

🔍 Search Terms

JSDoc tooltip for function type

✅ Viability Checklist

My suggestion meets these guidelines: Yes.

⭐ Suggestion

Show JSDoc tooltip for function type.

📃 Motivating Example

interface F {
  /**
   * Documentation.
   */
  (): void;
}

const f: F;

// In Visual Studio Code I see JSDoc tooltip on mouse hover when I use interface.
f();

/**
 * Documentation.
 */
type G = () => void;

const g: G;

// No JSDoc tooltip for function type.
g();

💻 Use Cases

This should improve working experience when using editors like Visual Studio Code.

Start by tracing the TypeScript language-service hover information used for the interface call signature and the function type alias shown in the motivating example. Reproduce both cases in Visual Studio Code and compare the returned tooltips; done when the function type receives its JSDoc tooltip as requested.