Hello, In Kotlin/WasmJs, I've created a simple sma...

# multiplatform

[Reginald Louis]

Hello,
In Kotlin/WasmJs, I've created a simple small function js wrapper:

fun jsLocalStorageGetItem(key: String): String =
    js("window.localStorage.getItem(key)")

If the key exist, no problem. If the key doesn't exist I have a NullPointerException on the browser console. I've try to add a String? as a return type

fun jsLocalStorageGetItem(key: String): String? =
    js("window.localStorage.getItem(key)")

But the compiler refuse this solution. Maybe I can get away with a try/catch (didn't try yet) but it seem odd to me we can't handle null value from calling js function...

[Reginald Louis]

image.png

[Robert Jaros]

Why the compiler refuses nullable return value for you? It works for me.

[Robert Jaros]

https://pl.kotl.in/T3uf-JcRo

[Robert Jaros]

There is a warning in the IDE, I've already reported this some time ago: https://youtrack.jetbrains.com/issue/KTIJ-28239/Wasm-IDE-False-positive-Redundant-nullable-return-type-when-using-js-function-with-nullable-return-type

[Reginald Louis]

You are totally right. Thx. it simplified my code a lot