Work-in-progress.
Keep commits atomic
1 commit or very few in each PR. Each PR should be doing only 1 thing
Don't introduce unnecessary, unintentional changes, especially adding/removing of whitespace unless it's really part of the PR
Write a clear 1-sentence commit message explaining what the commit is for. If there are important details such as the rationale for doing things in a certain way, add additional lines. git log --pretty=oneline should make sense
Draw attention to anything that the reviewer should look out for
If it's a simple UI change, include screenshots like this #3399
If the PR closes an issue, use GitHub keywords (eg. Closes #123) so GitHub will automatically close the issue when the PR is merged.
Commits introduced by PR should be based on the current master. Sometimes reviewers will request author to rebase master (git rebase master) if master has moved significantly since
If the PR is still a work-in-progress, make it a draft (GitHub feature), or use the "WIP. Don't Merge" label
If changes are needed after review, commit changes, rebase into a single (or a few) commits and force push
CamelCase, including abbreviations (some older code might not observe this)
Leave empty lines empty, without whitespace/indentation
Group private let/var before others in a type
Don't include unnecessary self. references. It suggests that self is strongly held in a closure.
Avoid using switch-default
Hide changes behind a flag in Features.swift if the change isn't ready yet but should be merged first. For example, maybe it needs more testing, but would be benefit to merge earlier to avoid merge conflicts.