.call selects the wrong overload, resulting in ts2554

[joshcartme]

🔎 Search Terms

I search for .call overload, this might be related to #29789 but I'm not sure

🕗 Version & Regression Information

• I looked back through some versions to 4.x on the playground and this was present in those I checked

⏯ Playground Link

https://www.typescriptlang.org/play/?ts=6.0.0-dev.20260217#code/MYewdgzgLgBAHgCwE4HkAOBTMMC8MAaAsgDIASUUaAShgI4CuG0AdGkiFBwJ6bMiZgA3ACgiZCtTqMWbDt178suGADN6YYFACW4GIrAAKALYYoCEABMANDHpIANgEoYAb2EBIJKbvZEqAcam5ta2Do4iAL4ioiTklDQMTFCs7JxQPBh8AspqGtq6+oFmljZ2Tq4eXlA+8MjoWMzAAIb29gZmWhA2JsUhZeHCUcJAA

💻 Code

// this passes
const xhrOpen = XMLHttpRequest.prototype.open;
XMLHttpRequest.prototype.open = function open(method, url) {
	return xhrOpen(method, url);
};

// the use of `.call` reports "Expected 4-6 arguments, but got 3.(2554)"
XMLHttpRequest.prototype.open = function open(method, url) {
	return xhrOpen.call(this, method, url); // error on this line
};

🙁 Actual behavior

.call reports "Expected 4-6 arguments, but got 3.(2554)"

🙂 Expected behavior

The use of .call infers that it matches the first overload the same way this is inferred without .call

From https://raw.githubusercontent.com/microsoft/TypeScript-DOM-lib-generator/refs/heads/main/baselines/dom.generated.d.ts open is typed as:

/**
 * The XMLHttpRequest method **`open()`** initializes a newly-created request, or re-initializes an existing one.
 *
 * [MDN Reference](https://developer.mozilla.org/docs/Web/API/XMLHttpRequest/open)
 */
open(method: string, url: string | URL): void;
open(method: string, url: string | URL, async: boolean, username?: string | null, password?: string | null): void;

Additional information about the issue

No response

[MartinJohns]

Duplicate of #38353.

[joshcartme]

Thanks @MartinJohns! The solution suggested there was to rewrite the function signature to not use an overload which I don't think is realistic here since the types are coming from lib.dom.

Do you know of any other workarounds?

[MartinJohns]

You can either use a type assertion, or you can bind the object like const bound = xhrOpen.bind(this); return bound(method, url); (I don't know if this has any performance implications.)