```class TemplateParser : StreamParser { overr...

# javascript

[Pitel]

class TemplateParser : StreamParser {
    override fun token(stream: StringStream, state: dynamic): String? {
        console.log(stream, state)
        return null
    }
}

This gets compile to this JS:

function TemplateParser() {}
    TemplateParser.prototype.token_qt5re9_k$ = function(stream, state) {
        console.log(stream, state);
        return null;
    }
    ;
    TemplateParser.prototype.token = function(stream, state) {
        return this.token_qt5re9_k$(stream, state);
    }
    ;

Which crashes with Uncaught TypeError: this.token_qt5re9_k$ is not a function

WTF?!

[Svyatoslav Kuzmich [JB]]

token is probably called without an object instance:

> var tp = new TemplateParser();
undefined
> tp.token("A", "B")
A B
null
> var token = tp.token
undefined
> token("A", "B")
Uncaught TypeError: this.token_qt5re9_k$ is not a function
    at TemplateParser.token (REPL9:2:21)

[Pitel]

It's used in a library, so I don't know how they are using it. But I rewrote it from class to just simple jsObject of that interface with var token and lambda, it's working.

[Svyatoslav Kuzmich [JB]]

Another possible workaround is using property with a function type:

external interface StreamParser {
    val token: (stream: StringStream, state: dynamic) -> String?
}

class TemplateParser : StreamParser {
   override val token = fun (stream: StringStream, state: dynamic): String? {
       …
    }
}