Looking at this issue I think OP is right, the doc...

# javascript

[Edoardo Luppi]

Looking at this issue I think OP is right, the documentation states
> Puts the given piece of a JavaScript code right into the calling function. The compiler replaces call to js(...) code with the string constant provided as a parameter
However it's not just a simple replacement, there is some validation going on, which blocks the use of certain JS features.
https://youtrack.jetbrains.com/issue/KT-67813

I wonder if a way to disable validation is doable?

[turansky]

My recommendation - use JsFunction factory instead of js blocks.
Validation only in runtime 😉

[Edoardo Luppi]

Oh nice workaround! You should post it in the issue too

[turansky]

It's not workaround 🙂
It's safest implementation of JS calls, which I see

[Edoardo Luppi]

I meant that it's a workaround to the validation

[loke]

I've used js("eval") as a workaround.

[turansky]

eval limitation - no inputs 😞

[loke]

@turansky I needed to exponentiate two bigints in JS, which the Kotlin compiler doesn't like. I assigned the two values as strings to a and b in the Kotlin code, and then did this: js("(function(a0,b0){return eval(\"a0**b0\");})(BigInt(a),BigInt(b))")

[turansky]

We already have BigInt support in wrappers.
Looks like missed PR or issue 🙂

[turansky]

How you write same operation for Int ?

[loke]

@turansky You can do it with any dynamic value: js("(function(a0,b0,c0,d0){eval(\"do something with a0, b0, etc\")})(a,b,c,d)

[loke]

Assuming that your values are in the Kotlin variables a,b,c,d.

[turansky]

FYI - you create new function on every call 😞

[turansky]

BigInt.pow added. Will be available in new release

[loke]

@turansky Yeah, it's a workaround. Thanks for the update about adding it.

[loke]

Basically, it's part of a multiplatform bigint/rational arithmetic library I implemented for my programming language (which itself is implemented in Kotlin). Here's the code if anyone is interested: https://codeberg.org/loke/array/src/branch/master/mpbignum