TypeError: Reflect.ownKeys is not a function

[Eeems]

If you call Profiler.output() before any data has been created you will get the following error:

> Profiler.output()
[21:27:58]TypeError: Reflect.ownKeys is not a function
    at outputProfilerData:217:26
    at Object.output:112:13
    at _console1512188878295_0:1:15718
    at eval:3:4
    at Object.r.runCode:2:144145

[0x000def42]

Somewhere I noticed that screeps works on the 8 node, I believe, then Reflect did not have the ownKeys method, you can use a polyfile.
https://github.com/ungap/own-keys