Plan step 37: the showcase and the error page's fallback serve CSS
without the application's Vite build, so nothing deduplicates their
@imports for them the way Vite's bundled postcss-import does — a
browser's native @import fetches every occurrence, it does not skip a
file it already loaded. Stylesheets::bundle(array $files, ?string
$base = null): string does in PHP what that build step does: it
inlines every @import depth-first, each file once, first occurrence
kept; leaves a bare specifier or an absolute URL untouched; rewrites a
relative url() against $base (or, without one, against the directory
of $files[0]); breaks a cycle instead of looping; throws naming the
importer when an import is missing; and caches per resolved file list
and mtime, with resetCache() for tests.
tests/Feature/StylesheetsBundleTest.php covers bundle()'s own
behaviour (dedup, url() rewriting, cycles, the missing-import
exception, the cache) and, at the end, pins the Vite deduplication
bundle() is modelled on against a real build — of all.css alone
(tests/Fixtures/dedup.vite.config.mjs), whose docblock explains why:
the Workbench's own entry still shares one file with @tailwindcss/vite
until plan step 39 removes it, and that plugin bundles its whole
reachable module graph itself, without the same dedup guarantee.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9
