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Will <https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.native.ref/-weak-reference/|Weak References> to Kotlin objects be supported in the WASM target?
They're an important mechanism for implementing some types of caches.
Direct expect/actual to<https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakRef| JS WeakRef> will only bridge 'external, primitive, string and function types' which is too limiting.

See:
• <https://github.com/tc39/proposal-weakrefs|WASM proposal for WeakRef support>
• Kotlin <https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.native.ref/-weak-reference/|WeakReference> type for Native
• <https://docs.oracle.com/javase/8/docs/api/java/lang/ref/WeakReference.html|WeakReference> type for JVM (inc. Kotlin)

Could I ask you to create an issue in YouTrack with this description?
We'll take a look at what we could do with it.

<https://youtrack.jetbrains.com/issue/KT-66230/Support-Weak-References-to-Kotlin-objects-in-WASM-JS-targets|Created>

:point_up: <@U0J2TNBAP> <@UFCJF8B9A> <@U022N4STBMM> <@U02BK8ABTQF>

Thanks for the report! Wasm GC does not have weak references yet, we have to go through JS.

&gt; Direct expect/actual to<https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakRef| JS WeakRef> will only bridge ‘external, primitive, string and function types’ which is too limiting.
You can use JsReference&lt;T&gt; to send any Kotlin object to JS and retrieve it back. <https://pl.kotl.in/OuLPsXSxS|An example of WeakReference implemented in wasmJs >

Many thanks <@UAZ8LS9KJ> for taking the time to provide this :raised_hands: - I've added it as a 'workaround method' to the YouTrack ticket also.