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I've noticed that the `js(...)`  intrinsic only supports ES5 syntax. The version of GWT used by the Kotlin/JS compiler also predates the release of the ES6 standard. I couldn't find any official documentation describing the exact behavior of the intrinsic, but is enforcing ES5 kind of a spec of Kotlin/JS?

The parser used by the Kotlin/JS compiler: <https://github.com/JetBrains/kotlin/blob/master/js/js.parser/README.md>

The GWT version used: <https://gwt.googlesource.com/gwt/+/138c60c7625a9403f34bd9616cea483fbdbeb2f0>

Not working (ES6):
<https://play.kotlinlang.org/#eyJ2ZXJzaW9uIjoiMi4yLjIwIiwiYXJncyI6IiIsIm5vbmVNYXJrZXJzIjp0cnVlLCJ0aGVtZSI6ImlkZWEiLCJjb2RlIjoicHJpdmF0ZSB2YWwgYSA9IGpzKFwiXCJcIigpID0+IDVcIlwiXCIpXG5cbmZ1biBtYWluKCkge1xuXHRwcmludGxuKGEoKSlcbn0iLCJwbGF0Zm9ybSI6ImpzIn0=|https://play.kotlinlang.org/#eyJ2ZXJzaW9uIjoiMi4yLjIwIiwiYXJncyI6IiIsIm5vbmVNYXJrZXJzIj[…]luKCkge1xuXHRwcmludGxuKGEoKSlcbn0iLCJwbGF0Zm9ybSI6ImpzIn0=>

Working (ES5):
<https://play.kotlinlang.org/#eyJ2ZXJzaW9uIjoiMi4yLjIwIiwiYXJncyI6IiIsIm5vbmVNYXJrZXJzIjp0cnVlLCJ0aGVtZSI6ImlkZWEiLCJjb2RlIjoicHJpdmF0ZSB2YWwgYSA9IGpzKFwiXCJcImZ1bmN0aW9uKCl7IHJldHVybiA1OyB9XCJcIlwiKVxuXG5mdW4gbWFpbigpIHtcblx0cHJpbnRsbihhKCkpXG59IiwicGxhdGZvcm0iOiJqcyJ9|https://play.kotlinlang.org/#eyJ2ZXJzaW9uIjoiMi4yLjIwIiwiYXJncyI6IiIsIm5vbmVNYXJrZXJzIj[…]FpbigpIHtcblx0cHJpbnRsbihhKCkpXG59IiwicGxhdGZvcm0iOiJqcyJ9>

Hello <@U05K4KAF5UY>
Yes, now it's supporting only ES5, and we're working on fixing it.
To track the updates regarding this issue, you can subscribe to this issue:
<https://youtrack.jetbrains.com/issue/KT-21626>

Thanks! I should've searched for the `js()` function itself, I only tried `ES5` and `ES6` :sweat_smile:

Also functions have native factories - you can use them as alternative.
<https://github.com/JetBrains/kotlin-wrappers/blob/c5c33c5c8a540eb2c85ab911244bf644ca25e3c7/kotlin-js/src/jsTest/kotlin/js/iterable/AsyncIteratorTest.kt#L18|Example>

<https://github.com/JetBrains/kotlin-wrappers/blob/c5c33c5c8a540eb2c85ab911244bf644ca25e3c7/kotlin-js/src/webMain/kotlin/js/core/BigInt.kt#L12|Regular function example>

<https://github.com/JetBrains/kotlin-wrappers/blob/5cdc4f2d2126b8deb0ec821faa968fef5e980583/kotlin-react-core/src/jsMain/kotlin/react/internal/functionRefToFunction.kt#L12|One more example>

<@U33H6SB2B> Thanks! Seems useful to me :smile: