Cannot run standalone compiler from babel-core in Rhino JavaScript engine

[jochenberger]

@Grab(group='org.mozilla', module='rhino', version='1.7.7')
import org.mozilla.javascript.Context
import org.mozilla.javascript.ContextFactory
import org.mozilla.javascript.ScriptableObject

ContextFactory contextFactory = new ContextFactory()
Context context = contextFactory.enterContext()
context.setOptimizationLevel(-1)
ScriptableObject scope = context.initStandardObjects()

new URL('https://cdnjs.cloudflare.com/ajax/libs/babel-core/5.8.25/browser.js').withReader {
  context.evaluateReader(scope, it, "browser.js", 1, null)
}

leads to

org.mozilla.javascript.EcmaError: TypeError: Expected argument of type object, but instead had type object (browser.js#56462)
    at org.mozilla.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3951)
    at org.mozilla.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3929)
    at org.mozilla.javascript.ScriptRuntime.typeError(ScriptRuntime.java:3962)
    at org.mozilla.javascript.ScriptRuntime.typeError1(ScriptRuntime.java:3974)
    at org.mozilla.javascript.ScriptableObject.ensureScriptable(ScriptableObject.java:2078)
    at org.mozilla.javascript.NativeObject.execIdCall(NativeObject.java:275)
    at org.mozilla.javascript.IdFunctionObject.call(IdFunctionObject.java:101)
    at org.mozilla.javascript.Interpreter.interpretLoop(Interpreter.java:1479)
    at script(browser.js:56462)
    at script.toType(browser.js:56399)
    at script(browser.js:56430)
    at script(browser.js:53410)
    at script.s(browser.js:2)
    at script(browser.js:2)
    at script(browser.js:57061)
    at script.s(browser.js:2)
    at script(browser.js:2)
    at script(browser.js:53038)
    at script.s(browser.js:2)
    at script(browser.js:2)
    at script(browser.js:53194)
    at script(browser.js:53193)
    at script.s(browser.js:2)
    at script(browser.js:2)
    at script(browser.js:45886)
    at script.s(browser.js:2)
    at script(browser.js:2)
    at script(browser.js:46294)
    at script(browser.js:46279)
    at script.s(browser.js:2)
    at script(browser.js:2)
    at script(browser.js:22728)
    at script.s(browser.js:2)
    at script(browser.js:2)
    at script(browser.js:21669)
    at script.s(browser.js:2)
    at script(browser.js:2)
    at script(browser.js:13974)
    at script.s(browser.js:2)
    at script(browser.js:2)
    at script(browser.js:5941)
    at script.s(browser.js:2)
    at script(browser.js:2)
    at script(browser.js:5787)
    at script(browser.js:5782)
    at script.s(browser.js:2)
    at script.e(browser.js:2)
    at script(browser.js:2)
    at script(browser.js:2)
    at script(browser.js:2)
    at org.mozilla.javascript.Interpreter.interpret(Interpreter.java:815)
    at org.mozilla.javascript.InterpretedFunction.call(InterpretedFunction.java:109)
    at org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:393)
    at org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3282)
    at org.mozilla.javascript.InterpretedFunction.exec(InterpretedFunction.java:120)
    at org.mozilla.javascript.Context.evaluateReader(Context.java:1250)
    at org.mozilla.javascript.Context$evaluateReader$1.call(Unknown Source)
    at babel$_run_closure1.doCall(babel.groovy:13)
    at babel.run(babel.groovy:11)

If I wrap the code in fromObject in a try-catch block, it seems that the object in question is null. I'm still trying to collect more information.

[jamiebuilds]

Babel only supports Node and the latest browsers.

[jochenberger]

Just for the record, this is caused by mozilla/rhino#233.