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Hello, I'm trying to translate `window.customElements.define('app-drawer', class extends HTMLElement {})` in kolin. I've tried `window.customElements.define("app-drawer", { js("class extends HTMLElement {}")})`, but it seems that the compiler try to analyse the `js("...")` content and don't understand the declaration.

Hi Yann, `js("...")` function takes only ES5 code when `class extends` is ES6 syntax

You always could create an object like
```
window.customElements.define("app-drawer",  object: HTMLElement() {
 ... 
})
```

Thanks. It's quite unconvenient as there a lot to "implements" (with definedExternally). There is no way to specify the target js version (and so the JS version allowed in `js("...")`) ?

Currently Kotlin/JS target version is ES5 so since `js()` is inlined into resulted js code it also should be ES5. We are now working hard to support different ES versions.

Ok, it's clear. Thanks for the answers :)