Retool Transformer gives non-descript "Unexpected identifier" message


I am trying to run this javascript transformer in order to restrict the number of columns returned from a bigquery query (as input for a graph), but I keep running into this issue where it returns "Unexpected identifier". I can't figure out what's wrong with it, there's no useful output in the browser's javascript console to tell me what the problem is.

I looks like there is a missing comma:

This is it, thank you!