**What is your use-case and why do you need this feature?** [decodeFromDynamic](https://kotlinlang.org/api/kotlinx.serialization/kotlinx-serialization-json/kotlinx.serialization.json/decode-from-dynamic.html) doesn't seem to be available in WasmJs source set (only on Js) **Describe the solution you'd like** Same as Js and even making it in webMain sourceset Created by request https://github.com/Kotlin/kotlinx.serialization/issues/1432#issuecomment-3311684920