Create #groovylang code that run in groovy, java and javascript environments

gistfile1.groovy

GrooscriptObservable.fromList(["one", "two", "three"])
    .take(2)
    .subscribe({arg -> println(arg)})

//In groovy and converted code in js, you get in console:
//one
//two

import org.grooscript.asts.GsNative

class GrooscriptObservable<T> {

    def observable

    GrooscriptObservable(List list) {
        this.observable = platformObservable(list)
    }

    def methodMissing(String name, args) {
        this.observable."$name"(*args)
    }

    static fromList(List list) {
        new GrooscriptObservable(list)
    }

    @GsNative
    private platformObservable(List list) {/*
        return Rx.Observable.from(list);
    */
        Class.forName("rx.Observable").invokeMethod("from", list)
    }
}