Errors in curried function with overloads in JsDoc

[timonson]

The following function with overloads with JsDoc throws two errors. Written in pure TypeScript it passes the compiler. Is there a way to do this in JsDoc?
If there is no way, can I expect a fix in the future maybe or is it just technically impossible at the moment?
Thanks!

/**
 * @type {{
 *   (init: "a"): () => string;
 *   (init: "b"): () => number;
 * }}
 */
export const foo = (init) => {
  return () => {
    switch (init) {
      case "a":
        return "abc";
      case "b":
        return 10;
      default:
        throw Error("Invalid body method.");
    }
  };
};

console.log(foo("a")());

2322 [ERROR]: Type '(init: "a" | "b") => () => string' is not assignable to type '{ (init: "a"): () => string; (init: "b"): () => number; }'.
Call signature return types '() => string' and '() => number' are incompatible.
Type 'string' is not assignable to type 'number'.
export const handleResponse = (init) => {
~~~~~~~~~~~~~~

TS2322 [ERROR]: Type '() => 10 | "abc"' is not assignable to type '() => string'.
Type 'string | number' is not assignable to type 'string'.
Type 'number' is not assignable to type 'string'.
return () => {

[MartinJohns]

• You forgot to fill out the issue template.
• This is a duplicate of proper overloading for arrow functions #47669. Arrow functions currently do not support overloads.

[timonson]

@MartinJohns it already works in pure TypeScript like I said in OP. So I am not sure why your link matters to my issue. I am asking about an error which occurs in JsDoc but which doesn't happen in TypeScript.

[MartinJohns]

it already works in pure TypeScript like I said in OP

It does not: Playground link

[timonson]

OK, I didn't want to make my question about arrow functions in the first place, but about how I can solve, if at all, my problem, which consists of typing the function in JsDoc, because it seems to work in pure TyperScript:

function bar(init: "a"): () => string;
function bar(init: "b"): () => number;
function bar(init: any): any {
  return () => {
    switch (init) {
      case "a":
        return "abc";
      case "b":
        return 10;
      default:
        throw Error("Invalid body method.");
    }
  };
}

[MartinJohns]

JSDoc currently does not support to document overloads in functions, see #25590.

[timonson]

Thank you!