I have encountered a possible BUG in js, see in b...

# javascript

[Shabinder Singh]

I have encountered a possible BUG in js,

see in below Screenshot , while executing a Test on js side in KMP Lib, it report an error of substring on undefined
while at compile time it is a String .

However when I add a redundant as String Cast the error disappears!

Any IDEA what could be the issue?

Anyway I reported the error to youtrack to here: https://youtrack.jetbrains.com/issue/KT-46157

[turansky]

Which names do you use for tests?

[Shabinder Singh]

@turansky see in screenshot below, But How does It Matter?

[turansky]

I mean name parameter, which produce such errors

[Shabinder Singh]

@turansky I quite dont follow, can you share an example of what you are asking?

Anyway you can check the whole project here if you want to https://github.com/Shabinder/youtube-api-dl

[Shabinder Singh]

I also Found that these tests are only failing in Legacy mode but do pass in IR Mode!

[Tarun Chawla]

@Shabinder Singh please be polite, sorry but I find you coc*y here.

[Shabinder Singh]

I am sorry if I came as coc**y , I never intended to.😶

Edit: I used Exclamation to put down emphasis there , never wanted to be rude to anyone.

After all I am asking for help, What could i gain by being rude…

[Shabinder Singh]

@turansky I guess I found the name parameter you wanted:

[turansky]

only failing in Legacy mode but do pass in IR Mode

Do you use String file level constants?

[Shabinder Singh]

I believe I dont

[turansky]

Looks like you prevent DCE error with as String

[Shabinder Singh]

DCE?

[turansky]

https://kotlinlang.org/docs/javascript-dce.html

[Shabinder Singh]

Ohh , so legacy compiler has some limitations or DCE in Legacy mode does?
As IR mode works fine.

Is there a way to make legacy mode work until 1.5 Kotlin releases as in 1.4.** have some issues with IR mode like stack overlflow while building etc

[turansky]

There are known DCE errors, which produce undefined strings

[Shabinder Singh]

there is no workaround for that?

[turansky]

Could you check name in init block?

[turansky]

init {
    println(name)
}

[turansky]

Also question, why you couldn’t calculate id ?

[turansky]

val id = name.substring(1).toInt()

[turansky]

@Shabinder Singh?

[Shabinder Singh]

I just dropped the idea of Using JS Legacy and will use IR as soon as Kotlin 1.5 launches .