webpacked "hello world" from Kotlin/JS erroring out with "empty expression not allowed"

[dfontenot]

Hello,

I am working on running some Kotlin/JS code under Duktape, and am running into this issue: SyntaxError: empty expression not allowed (line 1). I am using webpack to build a single .js file from the transpiled Kotlin code. I've observed this same error no matter what is in my .kt file, including even a simple hello world program.

To reproduce the issue:

main.kt

external fun print(input: Any)
fun main() {
    print("test from kotlin js")
}

Duktape 2.7.0 cmdline program output:

$ ./duk kotlin-test.js
SyntaxError: empty expression not allowed (line 1)
    at [anon] (kotlin-test.js:1) internal
    at [anon] (duk_js_compiler.c:4954) internal
error in executing file kotlin-test.js

Output from Node.JS version 18.4.1

$ node
Welcome to Node.js v18.14.1.
Type ".help" for more information.
> const print = (str) => console.log(str)
undefined
> require('./kotlin-test.js')
test from kotlin js
{}

Webpacked kotlin-test.js:

!function(t,e){"object"==typeof exports&&"object"==typeof module?module.exports=e():"function"==typeof define&&define.amd?define([],e):"object"==typeof exports?exports.openrct2_kotlinjs=e():t.openrct2_kotlinjs=e()}(this,(()=>{return t={295:function(t,e){var o,r;void 0===(r="function"==typeof(o=function(t){"use strict";return print("test from kotlin js"),t})?o.apply(e,[e]):o)||(t.exports=r)}},e={},function o(r){var n=e[r];if(void 0!==n)return n.exports;var p=e[r]={exports:{}};return t[r].call(p.exports,p,p.exports,o),p.exports}(295);var t,e}));

Am I doing something wrong with how I am generating the js bundle using webpack? I am just using the stock webpack setup in Kotlin/JS. Also, is there any general guidance on best webpack usage for targeting duktape?

Thanks.

[Dave Osborne]

Following, I get the same when webpacking TypeScript and executing in duktape.

[Dave Osborne]

I've moved to QuickJs and now JerryScript and don't have my DukTape project anymore, however it may be that DukTape doesn't like the 'Immediately Invoked Function Expression' which webpack creates.

I just read that IIFE can be disabled which may fix this?
https://webpack.js.org/configuration/output/#outputiife

[dfontenot]

It appears that IIFE was causing this. Workaround is listed below

I updated Kotlin, set kotlin.js.ir.output.granularity=whole-program, and tried again with a fresh project. New project included Webpack by default from the intellij project generator, and the webpacked result worked fine in duk.