Support the using keyword for functions

[KyleJune]

Describe the feature

The following check for the using keyword currently only allows it for objects. These lines will prevent the using keyword from being used on functions which is allowed in tsc.

swc/packages/helpers/esm/_using.js

Lines 5 to 7 in d6cd214

	if (typeof value !== "object") {
	throw new TypeError("using declarations can only be used with objects, null, or undefined.");
	}

A function can have the Symbol.dispose or Symbol.asyncDispose added to them to make them disposable just like how an object can. Here is the implementation in TypeScript, showing that it should allow the using keyword for functions.

https://github.com/microsoft/TypeScript/blob/36f9e9e037a8bf715d96c8270732d5830719d7c8/tests/baselines/reference/usingDeclarations.11.js#L57

if (typeof value !== "object" && typeof value !== "function") throw new TypeError("Object expected.");

Babel plugin or link to the feature description

No response

Additional context

This is based on a discussion about making spies and stubs disposable so that the originals will automatically be restored after they are no longer needed. This is needed to implement the feature.

denoland/std#3966

[Austaras]

babel/babel#16150

[swc-bot]

This closed issue has been automatically locked because it had no new activity for a month. If you are running into a similar issue, please create a new issue with the steps to reproduce. Thank you.