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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 <https://tc39.es/proposal-weakrefs/|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

<https://youtrack.jetbrains.com/issue/KT-8373/JS-support-ES6-as-compilation-target|https://youtrack.jetbrains.com/issue/KT-8373/JS-support-ES6-as-compilation-target>

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

In case anyone searches for this in the future, it's been added to the `kotlin-js` module in the official Kotlin Wrappers

I made a multiplatform wrapper: <https://opensavvy.gitlab.io/groundwork/pedestal/api-docs/weak/index.html> (discussion in <#C078Z1QRHL3|>)