execjs

(function(program, runner) { runner(program); })(function(PerfMeasurement,version,revertVersion,options,load,evaluate,run,readline,print,putstr,dateNow,help,quit,assertEq,assertJit,gc,gcparam,countHeap,makeFinalizeObserver,finalizeCount,setDebug,setDebuggerHandler,setThrowHook,trap,untrap,line2pc,pc2line,stackQuota,stringsAreUTF8,testUTF8,throwError,build,clear,intern,clone,getpda,getslx,toint32,evalcx,evalInFrame,shapeOf,resolver,sleep,scatter,snarf,read,compile,parse,timeout,elapsed,parent,wrap,serialize,deserialize,mjitstats,stringstats,newGlobal,it,custom,customRdOnly,environment,Worker) {
  return <%= source %>;
}, function(program, undefined) {
  var result;
  try {
    result = program();
    try {
      if (result === undefined) {
        print('["ok"]');
      } else {
        print(JSON.stringify(['ok', result]));
      }
    } catch (err) {
      print('["err"]');
    }
  } catch (err) {
    print(JSON.stringify(['err', '' + err, err.stack]));
  }
});