None of our existing files match these rules perfectly, but they're
something to aspire to. I've only checked a handful of files, so there
may be some unwanted or missing rules, and there are definitely some
missing globals.
Some of our more common spacing inconsistencies are currently set as
warnings rather than errors so they can be easily disabled to see more
dangerous stuff.
At some point we can use --fix to correct many problems in existing
files, but we should go through existing pull requests before doing that
to avoid conflicts. Eventually, we'll want to enforce linting as part of
a pre-push hook and CI.
