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fix(css): read an at-rule named with CSS escapes as that name - #22201
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🦋 Changeset detectedLatest commit: dc4a478 The changes in this PR will be included in the next version bump. This PR includes changesets to release 1 package
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Included review availability: Your plan provides up to 10 included reviews per hour; 2 remain after this review. 📝 WalkthroughWalkthroughThe CSS parser and minifier now decode escaped at-rule names before comparison. Name-length-sensitive slicing preserves the written spelling. Unit and configuration tests cover known, anonymous, namespace, and unknown escaped at-rules. ChangesEscaped at-rule names
Suggested labels: Priority: ⬇️ Low Change: Bug fix 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #22201 +/- ##
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+ Coverage 76.78% 95.01% +18.22%
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Files 599 751 +152
Lines 98678 104647 +5969
Branches 30782 32253 +1471
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+ Hits 75770 99427 +23657
+ Misses 22908 5220 -17688
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Inline comments:
In `@lib/css/syntax.js`:
- Line 4012: Update AT_RULE_NAME_SOURCE and ANONYMOUS_LAYER_RE to use the CSS
whitespace set (space, tab, newline, carriage return, and form feed) instead of
\s, and update _isAnonymousLayerPrelude to use _trimCssWhiteSpace rather than
trim() when checking the remaining prelude. Preserve correct named-layer
detection for non-ASCII whitespace.
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Merging this PR will degrade performance by 48.48%
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| Mode | Benchmark | BASE |
HEAD |
Efficiency | |
|---|---|---|---|---|---|
| ❌ | Memory | unit benchmark "html-parser-document-unit", parseHtml |
708.9 KB | 5,266 KB | -86.54% |
| ❌ | Simulation | benchmark "wasm-modules-sync", scenario '{"name":"mode-development","mode":"development"}' |
847.3 ms | 1,142.6 ms | -25.84% |
| ⚡ | Memory | benchmark "asset-modules-bytes", scenario '{"name":"mode-production","mode":"production"}' |
8.4 MB | 6.2 MB | +37.01% |
| 🆕 | Simulation | unit benchmark "html-printer-document-unit", beautify (sparse inline style) |
N/A | 9.3 ms | N/A |
| 🆕 | Simulation | unit benchmark "html-printer-document-unit", minify (sparse inline style) |
N/A | 9.4 ms | N/A |
| 🆕 | Simulation | unit benchmark "html-printer-document-unit", walk (sparse inline style) |
N/A | 3.7 ms | N/A |
| 🆕 | Memory | unit benchmark "html-printer-document-unit", beautify (sparse inline style) |
N/A | 14.9 KB | N/A |
| 🆕 | Memory | unit benchmark "html-printer-document-unit", minify (sparse inline style) |
N/A | 15.5 KB | N/A |
| 🆕 | Memory | unit benchmark "html-printer-document-unit", walk (sparse inline style) |
N/A | 3.9 KB | N/A |
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Comparing fix/css-escaped-at-rule-names (dc4a478) with main (3d2bec0)2
Footnotes
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6 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩
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An at-keyword may be written with escapes — `@\6c ayer` is `@layer` — but every table the minifier looks a name up in was keyed by the raw spelling, so such a rule took no branch any of them names. Two of those lookups are refusals rather than optimizations, which is where this is a defect rather than a missed one: a sheet writing `@\6c ayer a;` twice around a rule had the first statement dropped, moving where the layer sits in the cascade, and the same held for `@\69 mport`. What kept most sheets from reaching that was the namespace prologue scan treating any escaped at-keyword as a possible `@namespace`, which disabled every top-level transform for the whole stylesheet. The fold is stated once, in `_atKeyword`, and reached through a new `path.atKeyword()` for a node and `_namesAtRule` for printed text. Layer gathering stays on the plain spelling deliberately: it slices the layer's name at a fixed `NAMED_LAYER_OPENER_HEAD` an escape makes wrong, so an escaped `@layer` is gathered by nothing — the safe answer — while the refusals that keep two layers apart do read the name.
`AT_RULE_NAME_SOURCE`, `ANONYMOUS_LAYER_RE` and the prelude trim next to them used `\s` and `String.trim`, both of which treat U+00A0 as whitespace. CSS does not: it is an identifier code point, so a name carrying one keeps it, and truncating there reads `@layer ` as the `@layer` it is not. No output moves. Both helpers only ever refuse, and the deciding path for the tables they feed is the node-based `path.atKeyword()`, which reads the name the tokenizer built. This makes the two agree rather than leaving one of them right by being shadowed.
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Inline comments:
In `@lib/css/syntax.js`:
- Around line 4796-4799: Update AT_RULE_NAME_SOURCE used by BARE_AT_RULE_RE to
make hexadecimal escape matching deterministic: require either exactly six
hexadecimal digits or one to five digits not followed by another hexadecimal
digit, preserve optional CSS whitespace, and restrict the non-hexadecimal escape
alternative accordingly. Keep support for valid one-to-six-digit escapes and
existing at-rule name matching behavior.
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`AT_RULE_NAME_SOURCE` let two alternatives take the same `\6d`: the hex
escape, or the generic escape followed by the class. A prelude the opener
never matches then repartitioned the whole run on every backtrack, so a
60-character `@\6d…\6d (x){` took 8.2s and each further escape doubled it —
reached from `_openerKey` for any block opener, on whatever CSS a build is
handed.
The hex escape is now pinned to six digits, or to fewer with no hex digit
after it, and the generic escape excludes hex, so neither can take the
other's input. Every spelling reads as before: 20 escape forms, the CSS unit
tests and `configCases/css` are unchanged. The added case takes 93s and
fails on the old pattern against a 2s bound.
Types CoverageCoverage after merging fix/css-escaped-at-rule-names into main will be
Coverage Report |
`mergeDistantRules` landed with two expectations written before #22201 made an at-keyword read as the name its escapes spell. They assert that `@\6d edia` is left as it stands and that an escaped `@keyframes` keeps `from` — both of which were only true while the tables were keyed by the raw spelling, so they have failed on `main` since #22174 merged. The behaviour is the one #22201 established and is what the plain spelling already gets: the two escaped conditions join, the sheet echoes the spelling back as written, and the keyframe selector shortens. Added alongside is the refusal under an escaped name, since reading the name is what reaches it.
…t of lib/ root (#22213) * refactor: group the module graph's nodes and edges into lib/graph/ `lib/graph/` already held the two graphs a compilation carries; it now holds what they are graphs of. The edges join it — `Dependency`, the `DependenciesBlock` holding them and the `AsyncDependenciesBlock` for a block loaded on demand — and so does the chunk side, `Chunk`, `ChunkGroup`, `Entrypoint` and `HotUpdateChunk`. `lib/dependencies/` keeps the concrete subclasses and `lib/template/` the `DependencyTemplate` they print through; these are the base classes every build has. Root goes from 49 files to 45. Three re-exports are owed and kept. `ignore-webpack-plugin` requires `lib/Dependency` at the top level and peers webpack >=5; `external-svg-sprite-loader` and its pixolith fork require `lib/Chunk` the same way; `@vue/preload-webpack-plugin` requires `lib/Entrypoint` at module scope and peers webpack 5. `lib/Chunk`'s and `lib/Entrypoint`'s `tsType` in the schema point at the real path, since a type cannot be read through the re-export. `lib/AsyncDependenciesBlock` is recorded as unreachable instead: its only importer is hard-source-webpack-plugin, which also imports `lib/DependenciesBlockVariable` and `lib/JavascriptGenerator`, both removed in webpack 5. The two serializable classes keep their old request restorable through `registerLegacyRequest`, so a cache pack written before this loads. `AsyncDependenciesBlock`'s removed-property tombstone gains the JSDoc its `Dependency` counterpart already carried — without it the getter infers an implicit `any` that `tsc` reports once the file moves. * refactor: group the define plugins into lib/define/ `DefinePlugin` replaces a free identifier with a constant at parse time, and `EnvironmentPlugin` and `DotenvPlugin` are each that same plugin fed from somewhere else — one from `process.env`, one from a `.env` file, both constructing a `DefinePlugin` and handing it definitions. The three move together. `ProvidePlugin` substitutes an import rather than a value, so it stays out. Root goes from 45 files to 42. No re-export is owed: the ecosystem scan records no package importing any of the three paths, and none of them is serializable or named by a `tsType`. `DotenvPlugin` reads `schemas/WebpackOptions.json` relative to itself to validate its own options, so that request moves down a level with it. * refactor: move the last three stragglers into the directories that own them `ModuleInfoHeaderPlugin` prints the per-module comment header into the generated bundle through `Template`, so it joins `lib/template/`. `LazyBarrel` finds the barrel files worth deferring and is required only by `Compilation`, and `ConcatenationScope` is the protocol scope hoisting runs on — `lib/optimize/ConcatenatedModule.js` is the only thing that constructs one, while generators across `lib/` render through it — so both join `lib/optimize/`. Root goes from 42 files to 39. `lib/errors/` needed nothing: `WebpackError` and `ModuleNotFoundError` were moved there already and the root files are re-exports, as are `InitFragment` and `DependencyTemplate` for `lib/template/`. No re-export is owed for these three — the ecosystem scan records no package importing them — and none is serializable or named by a `tsType`. * refactor: record every path this moves that the scan finds no importer for The three-way classification the guide describes leaves a path nobody imports in neither map, which reads as an omission rather than as a decision. Record those nine under `removed` with the reason, so the record answers for every path that left `lib/` root in this change rather than only for the ones an importer was found for. The consequence is worth stating: `--write` skips a path `removed` names, so a package that starts importing one of these later is no longer recorded, and `--check` no longer learns a re-export is owed. * test(css): expect an escaped at-keyword to join like the name it spells `mergeDistantRules` landed with two expectations written before #22201 made an at-keyword read as the name its escapes spell. They assert that `@\6d edia` is left as it stands and that an escaped `@keyframes` keeps `from` — both of which were only true while the tables were keyed by the raw spelling, so they have failed on `main` since #22174 merged. The behaviour is the one #22201 established and is what the plain spelling already gets: the two escaped conditions join, the sheet echoes the spelling back as written, and the keyframe selector shortens. Added alongside is the refusal under an escaped name, since reading the name is what reaches it.
This PR contains the following updates: | Package | Change | [Age](https://docs.renovatebot.com/merge-confidence/) | [Confidence](https://docs.renovatebot.com/merge-confidence/) | |---|---|---|---| | [webpack](https://github.com/webpack/webpack) | [`5.111.1` → `5.112.0`](https://renovatebot.com/diffs/npm/webpack/5.111.1/5.112.0) |  |  | --- >⚠️ **Warning** > > Some dependencies could not be looked up. Check the [Dependency Dashboard](issues/99) for more information. --- ### Release Notes <details> <summary>webpack/webpack (webpack)</summary> ### [`v5.112.0`](https://github.com/webpack/webpack/blob/HEAD/CHANGELOG.md#51120) [Compare Source](webpack/webpack@v5.111.1...v5.112.0) ##### Minor Changes - Apply `plugins` set on a multi-configuration array to the `MultiCompiler`. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22702](webpack/webpack#22702)) - Add `optimization.minimize.css.dropOverriddenDeclarations`, dropping a declaration a later one overrides where no target is named. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22175](webpack/webpack#22175)) - Export more plugins under their scope, move eleven loose exports under theirs, deprecate the old, and expose `template.DependencyTemplate`, `module.NullFactory` and `util.makeSerializable`. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22261](webpack/webpack#22261)) - Let `util.makeSerializable` take several requests, current one first. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22340](webpack/webpack#22340)) - Emit the source map `scopes` field, so a debugger resolves imported ESM bindings by name. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​21999](webpack/webpack#21999)) - Add `library.entryExports: "all"` to expose the exports of every entry module. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22235](webpack/webpack#22235)) - Recognize a required `const` binding assigned to `exports` as a re-export. (by [@​hai-x](https://github.com/hai-x) in [#​22276](webpack/webpack#22276)) - Accept glob patterns in more path, module and file filter options. (by [@​hai-x](https://github.com/hai-x) in [#​22422](webpack/webpack#22422)) - Bundle a run of inline `<script>` tags into one chunk the page can inline. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22188](webpack/webpack#22188)) - Add `module.parser.javascript.topLevelThis` for classic-script `this` semantics. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22193](webpack/webpack#22193)) - Add `module.parser.html.chunkName` and a `webpackChunkName` comment for tags. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22200](webpack/webpack#22200)) - Add `include`/`exclude` version and request filters to shared modules. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22297](webpack/webpack#22297)) - Keep module side-effect information in ESM output as PURE annotations. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​21789](webpack/webpack#21789)) - Add `optimization.splitChunks.dedupDepth` to discover chunk intersections. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22240](webpack/webpack#22240)) - Add `optimization.minimizeOptions.json`, on by default with `futureDefaults`. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22286](webpack/webpack#22286)) - Add `SSRManifestPlugin` and fix server-rendered CSS collection and adoption. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​21913](webpack/webpack#21913)) - Add an `ignore` hook to `output.copy` and keep unfollowed `from` symlinks. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22216](webpack/webpack#22216)) - Add `optimization.minimize.css.convertApproximateColors`. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22157](webpack/webpack#22157)) - Add XML parsing and SVG/XML minification with data URLs and attribute sorting. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22269](webpack/webpack#22269)) - Extract CSS/HTML license comments like JS and safely shorten CSS gradients. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22408](webpack/webpack#22408)) - Resolve an async `DefinePlugin.runtimeValue` over an async `beforeParse` hook. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22210](webpack/webpack#22210)) - Add CSS `customMedia`/`customSelectors` minimize options; resolve chained names. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22360](webpack/webpack#22360)) - Rename the `Harmony*` names to `ESM*` and deprecate the old spellings. (by [@​hai-x](https://github.com/hai-x) in [#​22283](webpack/webpack#22283)) - Reduce `css.syntax`/`html.syntax` to `parser`, `printer`, `SourceProcessor` with one node path. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22233](webpack/webpack#22233)) - Add a JavaScript `SyntaxTree` read like the CSS one, and `toEstreeObject`. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22608](webpack/webpack#22608)) - Fix minified code that threw, and add `pure_conversions` and `pure_heritage`. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22473](webpack/webpack#22473)) - Shorten more CSS values and selectors, fold longhands, order declarations and gather layer blocks. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22442](webpack/webpack#22442)) - Add `optimization.minimize.css.charset`; `false` drops `@charset` for UTF-8 CSS. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22632](webpack/webpack#22632)) ##### Patch Changes - Join rules a gathered `@layer` leaves adjacent, and an at-rule with a later one (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22204](webpack/webpack#22204)) stating the same condition; read what a condition declares. - Read escaped CSS names and functions as spelled, and minify them unescaped. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22262](webpack/webpack#22262)) - Minify JavaScript, CSS and HTML assets whose names carry a `#fragment`. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22277](webpack/webpack#22277)) - Require `minimizer-webpack-plugin` 5.12, so inline scripts in HTML minify again. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22296](webpack/webpack#22296)) - Minify the attributes of an HTML tag without rewriting the template in it. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22166](webpack/webpack#22166)) - Order joined at-rule selector lists and gather a repeated large `@layer` block. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22224](webpack/webpack#22224)) - Preserve case-sensitive template identifiers when minifying HTML tag attributes. (by [@​bjohansebas](https://github.com/bjohansebas) in [#​22177](webpack/webpack#22177)) - Match Acorn's strict directives, Unicode identifiers and expression validation. (by [@​bjohansebas](https://github.com/bjohansebas) in [#​22185](webpack/webpack#22185)) - Skip concatenating modules when `optimization.providedExports` is disabled. (by [@​hai-x](https://github.com/hai-x) in [#​22410](webpack/webpack#22410)) - Join rules a nesting lowering or duplicate drop left for a second pass. (by [@​aryanraj45](https://github.com/aryanraj45) in [#​22268](webpack/webpack#22268)) - Write U+00A0 in a minified HTML attribute as the character, not ` `. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22208](webpack/webpack#22208)) - Escape a foreign `<script>` or `<style>` body, which is character data. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22233](webpack/webpack#22233)) - Name the runtime module whose generation fails while hashing. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22203](webpack/webpack#22203)) - Rebuild a module in watch when its missing unused dependencies swap. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22693](webpack/webpack#22693)) - Rebuild in watch mode when a file is deleted while a build is running. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22650](webpack/webpack#22650)) - Take out the declaration a lowered shorthand writes over, which its source spelling made look like a fallback. (by [@​aryanraj45](https://github.com/aryanraj45) in [#​22270](webpack/webpack#22270)) - Read a foreign `<script>` or `<style>` body as character data, not as raw text. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22258](webpack/webpack#22258)) - Keep an inline `<style>` body as written when rebuilding a page webpack emitted. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22265](webpack/webpack#22265)) - Fix minified HTML for `style` spellings, CSS quotes, `<noscript>` and a BOM. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22370](webpack/webpack#22370)) - Record a build dependency required through a spread on Bun. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22230](webpack/webpack#22230)) - Write a nested selector opening on a combinator against its parent the way the printer writes one. (by [@​aryanraj45](https://github.com/aryanraj45) in [#​22271](webpack/webpack#22271)) - Fix missing async stylesheets with a shared runtime. (by [@​bjohansebas](https://github.com/bjohansebas) in [#​22659](webpack/webpack#22659)) - Support deferred imports introduced by hot updates. (by [@​bjohansebas](https://github.com/bjohansebas) in [#​22668](webpack/webpack#22668)) - Fix trailing commas in `require.resolve()` and `require.resolveWeak()` calls. (by [@​bjohansebas](https://github.com/bjohansebas) in [#​22658](webpack/webpack#22658)) - Keep regular expressions, functions and plugins distinct in resolver caches. (by [@​bjohansebas](https://github.com/bjohansebas) in [#​22667](webpack/webpack#22667)) - Order the list a lowered nested selector lands in on what is written, not on what was. (by [@​aryanraj45](https://github.com/aryanraj45) in [#​22287](webpack/webpack#22287)) - Hoist a vendor-prefixed nested rule for a target that reads no nesting. (by [@​aryanraj45](https://github.com/aryanraj45) in [#​22308](webpack/webpack#22308)) - Name a hoisted nested rule in the dark-scheme copy it writes. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22318](webpack/webpack#22318)) - Minify data: URL payloads in HTML attributes and `new URL`, and web manifests. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22300](webpack/webpack#22300)) - fold a fallback's colors over the author's arguments, and print with (by [@​aryanraj45](https://github.com/aryanraj45) in [#​22314](webpack/webpack#22314)) `recurseBlocks: false` rather than throwing - Read a regular expression repeating a capture group name in linear time. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22187](webpack/webpack#22187)) - Make lazy barrels defer import declarations and keep no deferral across compilations. (by [@​hai-x](https://github.com/hai-x) in [#​22359](webpack/webpack#22359)) - Invalidate unaffected caches when connection activity or async status changes. (by [@​bjohansebas](https://github.com/bjohansebas) in [#​22431](webpack/webpack#22431)) - Order concatenated re-exports deterministically when their source order ties. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22697](webpack/webpack#22697)) - Regenerate a module's exports when a require() cycle forms or breaks around it. (by [@​aryanraj45](https://github.com/aryanraj45) in [#​22644](webpack/webpack#22644)) - Recompute re-exports, code and warnings when a module goes missing or returns. (by [@​bjohansebas](https://github.com/bjohansebas) in [#​22432](webpack/webpack#22432)) - Preserve loader resolution dependencies across cached rebuilds. (by [@​bjohansebas](https://github.com/bjohansebas) in [#​22430](webpack/webpack#22430)) - Read unwatched changes afresh and wait for restarted watch compilers to finish. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22646](webpack/webpack#22646)) - Parse loader output for `.wasm` as JavaScript when async wasm is auto-enabled. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22556](webpack/webpack#22556)) - Remove modules an async chunk inherits from a named parent chunk grown later. (by [@​hai-x](https://github.com/hai-x) in [#​22555](webpack/webpack#22555)) - Fix JavaScript minifier crashes, altered behavior, lost comments, unparsable output and null source map sources, including parameter aliases, ESTree trees and preserved names, and stop it writing into the caller's parse options. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22352](webpack/webpack#22352)) - Preserve the source phase of dynamic WebAssembly import contexts. (by [@​bjohansebas](https://github.com/bjohansebas) in [#​22604](webpack/webpack#22604)) - Await every async entry before resolving an ESM library import. (by [@​bjohansebas](https://github.com/bjohansebas) in [#​22617](webpack/webpack#22617)) - Keep unknown `import.meta` properties per module, alike for aliases and direct use. (by [@​bjohansebas](https://github.com/bjohansebas) in [#​22618](webpack/webpack#22618)) - Return WebAssembly modules directly from eager and weak source imports. (by [@​bjohansebas](https://github.com/bjohansebas) in [#​22606](webpack/webpack#22606)) - Handle missing ESM hot update manifests in Node.js without failing HMR checks. (by [@​bjohansebas](https://github.com/bjohansebas) in [#​22613](webpack/webpack#22613)) - Speed up JavaScript parsing: comment lookup, the tokenizer and the grammar. (by [@​bjohansebas](https://github.com/bjohansebas) in [#​22179](webpack/webpack#22179)) - Name a core module external by its key whichever spelling the code uses. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22565](webpack/webpack#22565)) - Prefix and drop 2009 flexbox names, keeping them where a box lays out by them. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22320](webpack/webpack#22320)) - Keep `initial` where Gecko or WebKit reads the property's keyword apart. (by [@​aryanraj45](https://github.com/aryanraj45) in [#​22176](webpack/webpack#22176)) - Fold `calc()` as lightningcss does, keeping it where a bare value is refused. (by [@​aryanraj45](https://github.com/aryanraj45) in [#​22205](webpack/webpack#22205)) - Keep a `color-mix()` whose hue rests on a gray's conversion residue. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22198](webpack/webpack#22198)) - Keep a shorthand's initial keyword where it parts two keywords of another slot. (by [@​dependabot](https://github.com/apps/dependabot) in [#​22518](webpack/webpack#22518)) - Group `lib/` and `lib/dependencies/` sources into directories. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22118](webpack/webpack#22118)) - Treat a browserslist target given at a bare major version (e.g. `safari 10`) as `<major>.0` when a feature's first supported version is a `[major, minor]` pair, so it is no longer reported as unsupported. (by [@​Eshiv-Pandey](https://github.com/Eshiv-Pandey) in [#​22280](webpack/webpack#22280)) - Keep the last HMR update with `output.clean`; stop rechecking removed files. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22339](webpack/webpack#22339)) - Read and print a CSS backslash as the spec does, and a NUL as U+FFFD. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22201](webpack/webpack#22201)) - Make minified CSS and HTML stable on a second pass, even for truncated input. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22290](webpack/webpack#22290)) - Minify a merged `<style>` run as one sheet, closing each where its input ended. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22302](webpack/webpack#22302)) - Minify JavaScript with webpack's printer under `futureDefaults`, `terser` otherwise. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22217](webpack/webpack#22217)) - Preserve `wrappedContextRegExp` flags when rebuilding context request matchers. (by [@​Eshiv-Pandey](https://github.com/Eshiv-Pandey) in [#​22303](webpack/webpack#22303)) - Minify CSS `@supports`, `@import` and `@custom-media` conditions, and exponent numbers. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22347](webpack/webpack#22347)) - Fold unitless `hsl()`/`hwb()` channels, and only where the separators are valid. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22242](webpack/webpack#22242)) - Split `@value` imports on the `from` keyword, not a substring in the path. (by [@​Eshiv-Pandey](https://github.com/Eshiv-Pandey) in [#​22306](webpack/webpack#22306)) - Destructure a dotted `DefinePlugin` key whose value is falsy or a runtimeValue. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22215](webpack/webpack#22215)) - Make `Stats.hasErrors()` read errors through the `processErrors` hook (via `getErrors()`), matching `hasWarnings()`, so a plugin that filters errors out of the hook is no longer contradicted by `hasErrors()`. (by [@​Eshiv-Pandey](https://github.com/Eshiv-Pandey) in [#​22281](webpack/webpack#22281)) - Allow wrapping an external concatenated module, now asked of the module itself, and re-exporting a JSON or asset `default` as a namespace object. (by [@​hai-x](https://github.com/hai-x) in [#​22226](webpack/webpack#22226)) - Match `urlHints` rules written with `and`, `or`, `not` and `glob` conditions; profile hook map taps, such as resolver and parser hooks, in `ProfilingPlugin`; report `import.meta` option errors inside `require.ensure` callbacks, not crash; and replace `any`, `object` and `Function` with precise types in the type definitions. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22681](webpack/webpack#22681)) - Reduce CSS and HTML build time and memory allocation. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22135](webpack/webpack#22135)) - Reuse free names instead of re-parsing modules for the entry IIFE rename. (by [@​hai-x](https://github.com/hai-x) in [#​22206](webpack/webpack#22206)) - Release each module's ast once scope-analysed, and encode each export path once. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22241](webpack/webpack#22241)) - Export a module library entry's default expression as its own binding, and keep (by [@​hai-x](https://github.com/hai-x) in [#​22227](webpack/webpack#22227)) the export helpers where the entry is not inlined. - Give a wrapped concatenated body the same function header as a module factory. (by [@​hai-x](https://github.com/hai-x) in [#​22254](webpack/webpack#22254)) - Skip reading every asset when no content hash is named. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22256](webpack/webpack#22256)) - Cut graph, cached set, lazy barrel and ESM import memory and allocations. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22289](webpack/webpack#22289)) - Stop a module source from being held as both a string and a buffer. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22294](webpack/webpack#22294)) - Read the browserslist data and options schema only when a build needs them. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22324](webpack/webpack#22324)) - Release the eval devtool's cached module sources after wrapping them. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22358](webpack/webpack#22358)) - Release the rendered module sources after emitting the chunks. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22365](webpack/webpack#22365)) - Cut the peak memory and time of minifying through webpack's printer. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22368](webpack/webpack#22368)) - Shrink minified JS: unwrap IIFEs, fold calls, drop dead code, split arrays. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22393](webpack/webpack#22393)) - Cut JavaScript minifier time and memory; keep token positions in large inputs. (by [@​bjohansebas](https://github.com/bjohansebas) in [#​22329](webpack/webpack#22329)) - Keep the `calc()` around a `steps()` count `jump-none` would reject bare. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22168](webpack/webpack#22168)) - Split the CSS syntax module into a parser file and a printer file. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22222](webpack/webpack#22222)) - Update enhanced-resolve to 5.26.0. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22358](webpack/webpack#22358)) - Update watchpack to 2.6.1. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22670](webpack/webpack#22670)) - Split the HTML syntax module into a parser file and a printer file. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22223](webpack/webpack#22223)) - Rename classes in `lib/` so each says what it does and no two share a name. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22361](webpack/webpack#22361)) - Keep the remote fallback index aligned with registered container externals when an `internal ` external precedes a real one. (by [@​Eshiv-Pandey](https://github.com/Eshiv-Pandey) in [#​22362](webpack/webpack#22362)) - Stop a minified inlined chunk leaving a doubled `;` in its `<script>`. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22370](webpack/webpack#22370)) - Stop `mergeDistantRules` mangling rules or reordering `all`, and merge more. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22370](webpack/webpack#22370)) - Minify by parsing with webpack's own parser rather than terser's. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22397](webpack/webpack#22397)) - Read JavaScript with webpack's parser alone when minifying, refusing early errors. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22397](webpack/webpack#22397)) - Parse an `assert(...)` call after an import with no semicolon, and a regular expression after `yield` in a generator method. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22406](webpack/webpack#22406)) - Keep the private names a direct `eval` reads when mangling. (by [@​aryanraj45](https://github.com/aryanraj45) in [#​22412](webpack/webpack#22412)) - Keep a class dropped for its effects where they read a private name it declares. (by [@​aryanraj45](https://github.com/aryanraj45) in [#​22421](webpack/webpack#22421)) - Parenthesize the right side of a private `in`, a `yield`, `await`, private `in` or optional chain tagging a template, and a `let` or `async` starting a statement or loop head, where the minifier printed code that no longer parsed or read otherwise. (by [@​aryanraj45](https://github.com/aryanraj45) in [#​22437](webpack/webpack#22437)) - Keep a name a parameter list or catch parameter reads from resolving to what the function body or catch block declares, which the minifier renamed or dropped as unused. (by [@​aryanraj45](https://github.com/aryanraj45) in [#​22439](webpack/webpack#22439)) - Scope and export a CSS Modules `@value` the same way whether local or imported. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22443](webpack/webpack#22443)) - Keep CSS `border: none` and gradient fallbacks for units a target cannot read. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22567](webpack/webpack#22567)) - Keep minified CSS safe for older browsers; drop dead fallbacks and overrides. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22696](webpack/webpack#22696)) - Keep CSS rules apart from a neighbor whose selector no browser parses. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22634](webpack/webpack#22634)) - Keep an `:nth-*()` argument with a space after its sign as written. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22700](webpack/webpack#22700)) - Keep minified CSS readable by browsers the compat data does not cover. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22701](webpack/webpack#22701)) - Keep a module its chunk still needs after `compilation.rebuildModule()`. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22705](webpack/webpack#22705)) - Keep a CSS rule nested under a selector opening on a combinator when lowering. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22707](webpack/webpack#22707)) - Use module paths for webpack's built-in minimizers so parallel minification can load them directly in workers instead of serializing their function sources. (by [@​xiaoxiaojx](https://github.com/xiaoxiaojx) in [#​22309](webpack/webpack#22309)) - Keep stats from an earlier build readable after a later build no longer has one of their modules. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22695](webpack/webpack#22695)) </details> --- ### Configuration 📅 **Schedule**: (UTC) - Branch creation - "before 9am on tuesday" - Automerge - At any time (no schedule defined) 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about this update again. --- - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box --- This PR has been generated by [Mend Renovate CLI](https://github.com/renovatebot/renovate). <!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0NC4xNjcuMCIsInVwZGF0ZWRJblZlciI6IjQ0LjE2Ny4wIiwidGFyZ2V0QnJhbmNoIjoiZGV2ZWxvcCIsImxhYmVscyI6WyJkZXBlbmRlbmNpZXMiLCJyZW5vdmF0ZSJdfQ==--> Reviewed-on: https://code.futo.org/harbor/harbor/pulls/1941 Reviewed-by: Mark Harding <mark@futo.org>
Summary
An at-keyword may be written with CSS escapes —
@\6c ayeris a legal spelling of@layer— but every table the CSS minifier looks a name up in was keyed by the raw spelling, so such a rule took no branch any of them names. Two of those lookups are refusals rather than optimizations, which is where this is a defect and not a missed one: a sheet writing@\6c ayer a;twice around a rule had the first statement dropped, moving where that layer sits in the cascade, and@\69 mportbehaved the same. What kept most sheets from reaching it was the namespace-prologue scan treating any escaped at-keyword as a possible@namespace, which disabled every top-level transform for the whole stylesheet.The fold is now stated once (
_atKeyword) and reached throughpath.atKeyword()for a node and_namesAtRulefor printed text. Layer gathering deliberately stays on the plain spelling — it slices the name at a fixedNAMED_LAYER_OPENER_HEADan escape makes wrong, so an escaped@layeris gathered by nothing, which is the safe answer — while the refusals that keep two layers apart do read the name. Over every.cssfile intest/under four option sets, exactly one fixture's output moves (configCases/css/parsing/cases/at-rule.css, the only one carrying an escaped at-keyword), and it becomes byte-identical to what that sheet already produced without the escape.What kind of change does this PR introduce?
fix
Did you add tests for your changes?
Yes —
test/configCases/css/minimize-escaped-at-rule-names/(snapshotted emitted CSS) and a newdescribeintest/unitCases/CssSyntax.unittest.js; 6 of its 9 cases fail onmain, the other 3 pin the refusals that must stay refused.Does this PR introduce a breaking change?
No.
If relevant, what needs to be documented once your changes are merged or what have you already documented?
n/a
Use of AI
Claude Code was used throughout: to locate the at-rule name lookups, write the change and its tests, and run the verification (a differential over every
.cssfixture in the repo againstmain, plus bisecting each behaviour to the hunk that carries it). One intermediate revision regressed anonymous-layer handling; that was caught by the differential and is why layer gathering is left on the plain spelling here. Every claim above was measured rather than assumed, and all output was reviewed by me.Generated by Claude Code
Summary by CodeRabbit
@layer,@media,@supports,@keyframes, and@namespacenow receive the same handling as their standard spellings.