The device renders in Chrome 113, which predates relaxed CSS nesting, so
a nested rule whose selector starts with an element name is not a parse
error anyone would notice -- the rule simply does not exist, there and
nowhere else. Three were live in `index.css`, and the one that mattered
was the `text-overflow: ellipsis` on the bottom bar's title and artist,
which had therefore never truncated on the device. No tier here can see
the class at all: the component tier, the e2e tier and `make ui-visual`
all run a current engine, where the rule applies normally.
So `make css-check` carries a second script. It reads `index.css` and
the `css` literals in `src/**/*.ts` alike, since a shadow-root
stylesheet is parsed by the same engine, and it names the file, the line
and the fix -- a leading `&`, which is valid in both syntaxes.
The detection walks blocks rather than matching lines, and both things
it has to get right fall out of one rule: a rule is nested when a
*style* rule is somewhere above it, not when its immediate parent is a
block. That leaves `@media (...) { bottom-nav { ... } }` at the top
level alone, which is the majority of what a regex over the file would
report, and still flags the same rule inside an at-rule that is itself
inside a style rule. Strings and comments are read through, so a brace
in a `url()` is not a block.
The tree has no violation left, so the check would pass just as happily
over an empty glob: it refuses one, and `test/utils/css-nesting.test.ts`
pins the semantics that make the sweep mean something. The literal
scanner the two checks share is lifted into `css-literals.mjs`
unchanged, except that a `${}` substitution is now blanked keeping its
newlines so a line number survives it.
Closes#154
A backtick inside a comment in a css`` literal ends the literal. It has
cost four sessions across three plans, it is written down in CLAUDE.md,
the skill and NOTES.md, and it was read twice in the session it then
cost a cycle in. Knowledge that has been ignored three times is not a
knowledge problem.
The expense is the report, not the mistake: the literal ends early, the
rest of the CSS parses as JavaScript, and tsc says 'Class static side
incorrectly extends base class static side' pointing at a line of prose
-- or, in a shared module, every test in the suite fails to import and
the output reads like a broken test runner. make dev-headless mean-
while keeps serving the last good bundle.
Detection is exact rather than heuristic: if a backtick in a comment
closed the literal early, the text the parser took as the literal
contains an unterminated /*. Nothing else produces that. Verified both
ways -- clean on the tree, and red on a deliberately broken comment.
logan