Review Request #12766 — Created Jan. 6, 2023 and submitted
We like to aim for trailing commas in code when possible, and tend to
write new code this way. However, we've have had a lot of legacy
still lacked commas.
This change updates all ES6 code to use trailing commas.
This helps satisfy ESLint.
Verified that ESLint no longer had complaints about trailing commas.