Javascript features not supported?

[cljnilsson]

So I was going for a OOP approach to a NPC scripted shop.
But it seems like using classes does not compile or something.

function start() {    status = -1;
    action(1, 0, 0);
}

function action(mode, type, selection) {
            cm.writeline("xxxx");
} 

Which works fine, prints the message nicely.

However when I add the following:

class Chair {    constructor() {
        this.id = id;
        this.price = cost;
    }
}

class Shop {
    constructor(currency) {
        this.chairs = [];
        this.count = 0;
        this.currency = currency;
    }

    addChair(id, cost) {
        this.chairs[count] = new Chair(id, cost);
        this.count += 1;
    }

} 

The npc does nothing.


edit:
I get the following error:
scripts/npc/world0/9901200.js
javax.script.ScriptException: <eval>:7:0 Expected an operand but found class
class Chair {
^ in <eval> at line number 7 at column number 0
at jdk.nashorn.api.scripting.NashornScriptEngine.throwAsScriptException(NashornScriptEngine.java:467)
at jdk.nashorn.api.scripting.NashornScriptEngine.compileImpl(NashornScriptEngine.java:534)
at jdk.nashorn.api.scripting.NashornScriptEngine.compileImpl(NashornScriptEngine.java:521)
at jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:399)
at jdk.nashorn.api.scripting.NashornScriptEngine.eval(NashornScriptEngine.java:150)
at javax.script.AbstractScriptEngine.eval(Unknown Source)
at scripting.AbstractScriptManager.getInvocable(AbstractScriptManager.java:63)
at scripting.npc.NPCScriptManager.start(NPCScriptManager.java:61)
at net.server.channel.handlers.NPCTalkHandler.handlePacket(NPCTalkHandler.java:59)
at net.MapleServerHandler.messageReceived(MapleServerHandler.java:127)
at org.apache.mina.core.filterchain.DefaultIoFilterChain$TailFilter.messageReceived(DefaultIoFilterChain.java:690)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:417)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:47)
at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:765)
at org.apache.mina.filter.codec.ProtocolCodecFilter$ProtocolDecoderOutputImpl.flush(ProtocolCodecFilter.java:407)
at org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(ProtocolCodecFilter.java:236)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:417)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:47)
at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:765)
at org.apache.mina.core.filterchain.IoFilterAdapter.messageReceived(IoFilterAdapter.java:109)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:417)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.fireMessageReceived(DefaultIoFilterChain.java:410)
at org.apache.mina.core.polling.AbstractPollingIoProcessor.read(AbstractPollingIoProcessor.java:710)
at org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:664)
at org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:653)
at org.apache.mina.core.polling.AbstractPollingIoProcessor.access$600(AbstractPollingIoProcessor.java:67)
at org.apache.mina.core.polling.AbstractPollingIoProcessor$Processor.run(AbstractPollingIoProcessor.java:1124)
at org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:64)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: jdk.nashorn.internal.runtime.ParserException: <eval>:7:0 Expected an operand but found class
class Chair {
^
at jdk.nashorn.internal.parser.AbstractParser.error(AbstractParser.java:292)
at jdk.nashorn.internal.parser.AbstractParser.error(AbstractParser.java:277)
at jdk.nashorn.internal.parser.Parser.unaryExpression(Parser.java:3182)
at jdk.nashorn.internal.parser.Parser.expression(Parser.java:3282)
at jdk.nashorn.internal.parser.Parser.expressionStatement(Parser.java:1150)
at jdk.nashorn.internal.parser.Parser.statement(Parser.java:967)
at jdk.nashorn.internal.parser.Parser.sourceElements(Parser.java:773)
at jdk.nashorn.internal.parser.Parser.program(Parser.java:709)
at jdk.nashorn.internal.parser.Parser.parse(Parser.java:283)
at jdk.nashorn.internal.parser.Parser.parse(Parser.java:249)
at jdk.nashorn.internal.runtime.Context.compile(Context.java:1286)
at jdk.nashorn.internal.runtime.Context.compileScript(Context.java:1253)
at jdk.nashorn.internal.runtime.Context.compileScript(Context.java:625)
at jdk.nashorn.api.scripting.NashornScriptEngine.compileImpl(NashornScriptEngine.java:532)
... 29 more

[MentaL]