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
logan
7f8e185d7c