I'm trying to make a multiplatform WeakrefMap, but for some reason WeakRef/WeakMap is not available on the JS target. What can I do instead?

the WeakRef proposal for JS was only accepted for ES12 and Kotlin/JS still targets ES5, so you can't really do anything (in a cross-platform safe way)

But isn't it already available in every browser and nodejs? https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakMap

Kotlin/JS isn't up to date with the latest JS standards

I see, so there's currently no way to have a weakmap equivalent in Kotlin/JS?