Signature help shows no JSDoc for a const with a function type annotation #64937

🔎 Search Terms

signature, parameter hints, jsdoc, const, type annotation, function type, @param

🕗 Version & Regression Information

• This changed between versions 6.0.3 and 7.0.2 (also in 7.1.0-dev.20261023.1)

⏯ Playground Link

https://www.typescriptlang.org/play/?#code/PQKhCgAIUhBATeBnSB7AdgU0gF1ZAQ0nQFcBbAI0wCcA6KGAAQAcDqCzIA3AgGxOwAVABbZSlGrnwFEaLFPrRg4eJgDGvNtjUYkOQogDyWAFyQAFD36Yz4qtQCUkALwA+YuXsBucOBnxjTCA

💻 Code

/**
 * Adds one to a number.
 * @param value The number to add one to.
 */
declare const addOne: (value: number) => number;

addOne(1);
//     ^ trigger signature help here

🙁 Actual behavior

Signature help shows addOne(value: number): number with no description and no documentation for value. Hover on addOne does show the JSDoc.

(Type ( in the playground to ensure JSDoc is shown for the parameter in TS 6)

🙂 Expected behavior

Signature help shows "Adds one to a number." and "The number to add one to." for value, like 6.0.3 does.

Additional information about the issue

The same happens with an initializer, like const addOne: (value: number) => number = otherFunction.

(const addOne = (value: number) => value + 1 works: the docs come from the arrow function)