Round 2 mutation-checked round 1's own fix and found the one line it left
uncovered: every table row was an integer, so `Math.floor(sec)` in the new
seconds tier could be deleted or swapped for round/ceil with the suite still
green — exactly the "later cleanup removes it as redundant" failure the fix's
comment claims to prevent. Two fractional rows kill all three mutants.
Epic-end deep review, round 1. Six findings survived verification; five of them
were one defect wearing different hats.
formatRuntime floored 1-59s to "0m". Harmless while it only ever formatted a
Plex movie's length, but 12D repurposed it for an aggregate, and a total is the
only input that can land under a minute: a playlist of Shorts reported "0m"
while the rail beside it read "0:45". Fixed in the function, not behind a
`>= 60` guard at each of the seven call sites — the invariant belongs where it
cannot be forgotten. Its contract comment claimed "Plex movie/episode lengths"
and was two epics stale.
The rail rendered the same playlist total as formatDuration (1:23:45) while the
new header rendered formatRuntime (1h 23m) — two shapes of one number, side by
side on one screen. The rail now uses formatRuntime too; formatTotalHours had
already recorded that H:MM:SS is wrong for an aggregate.
The rename input kept min-w-0 without flex-1 in the compacted row, so it was
the only shrinkable child beside a shrink-0 action cluster. The Plex half of
this same epic already had the fix; this restores the symmetry.
plex.browse.items had no plural forms, so a one-item Plex playlist read
"1 items". Pre-existing, but the new header is the call site where count=1 is
ordinary. Both languages get both forms, no key drift.
formatRuntime had no unit tests at all across seven call sites. Added a tier
table plus a sweep asserting no non-zero second ever renders as "0m".
Dropped after 3/3 adversarial refutations: the meta-line segment ordering
(the filtered count is labelled, and count-then-runtime is the convention) and
the null-duration lower bound (the server's own SUM has skipped NULLs since
long before this branch; changing only the client would split them).
The tier table kept a divisor and a translation key as two independently
maintained halves, and a mispairing there rendered minutes as "Ns ago" for 59
releases. The table now pairs a divisor with the Intl unit it produces and the
platform supplies the words, so the wrong half is at least self-evident on
sight — "minute" next to 3600 reads wrong in a way "time.minutesAgo" never
did. It also removes 12 hand-written strings and hands plural rules to CLDR
for any language added later.
Hungarian output is byte-identical to the strings it replaces. English gets
shorter: "59 min ago" to "59m ago", "1 wk ago" to "1w ago", "1 mo ago" to
"1mo ago", "1 yr ago" to "1y ago"; "2h ago" and "1d ago" are unchanged.
style narrow matches the app's compact timestamps and numeric always keeps it
counting, rather than "yesterday"/"last week". time.justNow stays because Intl
has no wording for the sub-minute case. Formatters are memoized per language,
since this runs once per rendered timestamp across a virtualized feed.
Review follow-ups on the tier-shift fix. The table moves to a module-level
RELATIVE_UNITS: it is constant, so rebuilding it per call was pure garbage on
a path that runs once per rendered timestamp across a virtualized feed.
Its ascending order is load-bearing and was unstated — sorting it largest-first
would make every timestamp under a year read "just now", silently, the same
shape as the bug this branch fixes. It is now documented and asserted, and the
suite derives its tier coverage and translation checks from the table itself
rather than from its own case list, so a new tier cannot slip in uncovered.
The audit log read the empty string for an unreadable date as a value and
rendered a blank cell; it now uses the `|| "—"` idiom the channel table
already uses, so missing and unreadable dates look alike.
The repo had no unit-test runner, so this adds the minimum: vitest (3.x, as
4.x needs Vite 6), a node-env config deliberately separate from vite.config.ts
so the production build never loads it, npm test / test:watch, and a knip
entry so the config and specs are not reported unused. Browser flows stay in
e2e/ under Playwright.
The suite samples every tier at its exact opening second as well as inside it,
and stubs i18n so each assertion lands on the key rather than the copy. An
interior-only suite still passes when the range comparison flips to <=, which
is how the tier shift went unnoticed for so long.
peter