Plan step 37 review. bundle() left an @import it did not recognise
exactly as written, in the middle of the output, where a browser ignores
it: a layer(), supports() or media condition was silently dropped, an
unquoted url(./x.css) import was left in place with its path mangled by
the url() rewrite, and a bare specifier or absolute URL vanished the same
way. An @import after a rule or inside a @layer block was inlined anyway,
nesting a whole file's layers inside another. Each now throws, naming the
file; unquoted url() imports and @IMPORT inline like the other forms.
The cache keyed only the top-level files' mtimes, so a changed
button.css left a cached all.css bundle standing in a long-lived worker;
a cached bundle is now served only while every file it inlined keeps its
mtime. A null and an empty $base no longer share a cache key, a leading
@charset or byte-order mark is dropped from each inlined file, and a
test pins the import graph free of cycles, the one case where a
depth-first bundle would place a stylesheet before a file it imports.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9
