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# Repository Rules
Last Updated 2026-01-08
These rules MUST be followed at all times, it is very important.
- Never use `git add -A` - add specific changes to a deliberate commit. A commit
should contain one change. After each change, make a commit with a good
one-line summary.
- NEVER modify the linter config without asking first.
- NEVER modify tests to exclude special cases or otherwise get them to pass
without asking first. In almost all cases, the code should be changed, NOT the
tests. If you think the test needs to be changed, make your case for that and
ask for permission to proceed, then stop. You need explicit user approval to
modify existing tests. (You do not need user approval for writing NEW tests.)
- When linting, assume the linter config is CORRECT, and that each item output
by the linter is something that legitimately needs fixing in the code.
- When running tests, use `make test`.
- Before commits, run `make check`. This runs `make lint` and `make test` and
`make check-fmt`. Any issues discovered MUST be resolved before committing
unless explicitly told otherwise.
- When fixing a bug, write a failing test for the bug FIRST. Add appropriate
logging to the test to ensure it is written correctly. Commit that. Then go
about fixing the bug until the test passes (without modifying the test
further). Then commit that.
- When adding a new feature, do the same - implement a test first (TDD). It
doesn't have to be super complex. Commit the test, then commit the feature.
- When adding a new feature, use a feature branch. When the feature is
completely finished and the code is up to standards (passes `make check`) then
and only then can the feature branch be merged into `main` and the branch
deleted.
- Write godoc documentation comments for all exported types and functions as you
go along.
- ALWAYS be consistent in naming. If you name something one thing in one place,
name it the EXACT SAME THING in another place.
- Be descriptive and specific in naming. `wl` is bad; `SourceHostWhitelist` is
good. `ConnsPerHost` is bad; `MaxConnectionsPerHost` is good.
- This is not prototype or teaching code - this is designed for production. Any
security issues (such as denial of service) or other web vulnerabilities are
P1 bugs and must be added to TODO.md at the top.
- As this is production code, no stubbing of implementations unless specifically
instructed. We need working implementations.
- NEVER silently fall back to a different setting when a user's parameter
explicitly specifies a value. If a user requests format=webp and WebP encoding
is not supported, return an error - do NOT silently output PNG instead. If a
user specifies fit=invalid and that fit mode doesn't exist, return an error -
do NOT silently default to "cover". Silent fallbacks violate the principle of
least surprise and mask bugs. The only acceptable defaults are for OMITTED
parameters, never for INVALID explicit values.
- Avoid vendoring deps unless specifically instructed to. NEVER commit the
vendor directory, NEVER commit compiled binaries. If these directories or
files exist, add them to .gitignore (and commit the .gitignore) if they are
not already in there. Keep the entire git repository (with history) small -
under 20MiB, unless you specifically must commit larger files (e.g. test
fixture example media files). Only OUR source code and immediately supporting
files (such as test examples) goes into the repo/history.