Gist to show implementation towards FileReader support for Kweb-core https://github.com/kwebio/kweb-core/issues/165

FileReaderSupport.kt

fun InputElement.setAccept(acceptedTypes: String): Unit = element.execute("$jsExpression.accept=\"$acceptedTypes\";")
fun InputElement.multiple(isMultiple: Boolean): Unit = element.execute("$jsExpression.multiple=\"$isMultiple\";")
//Usage-
input(InputType.file).let {

    it.setAccept("audio/*")
    it.multiple(true)
}