chore(alpha): pin Jess 2.0.0-alpha.29

packages/less/package.json

@@ -142,15 +142,15 @@
 	"rawcurrent": "https://raw.github.com/less/less.js/v",
 	"sourcearchive": "https://github.com/less/less.js/archive/v",
 	"dependencies": {
-		"@jesscss/compiler": "2.0.0-alpha.27",
-		"@jesscss/core": "2.0.0-alpha.27",
-		"@jesscss/plugin-less": "2.0.0-alpha.27",
-		"@jesscss/plugin-less-compat": "2.0.0-alpha.27",
-		"@jesscss/plugin-node-modules": "2.0.0-alpha.27",
+		"@jesscss/compiler": "2.0.0-alpha.29",
+		"@jesscss/core": "2.0.0-alpha.29",
+		"@jesscss/plugin-less": "2.0.0-alpha.29",
+		"@jesscss/plugin-less-compat": "2.0.0-alpha.29",
+		"@jesscss/plugin-node-modules": "2.0.0-alpha.29",
 		"parse-node-version": "^1.0.1"
 	},
 	"peerDependencies": {
-		"@jesscss/plugin-js": "2.0.0-alpha.27"
+		"@jesscss/plugin-js": "2.0.0-alpha.29"
 	},
 	"peerDependenciesMeta": {
 		"@jesscss/plugin-js": {

packages/less/test/alpha-fixtures.mjs

@@ -117,7 +117,6 @@ const expectedFailureFixtures = new Map([
     ['tests-config/sourcemaps-basepath/sourcemaps-basepath.less', 'map is produced (gated by test/alpha-sourcemaps.mjs) but its source-path normalization/embedded-sources do not byte-match the 4.x golden yet'],
     ['tests-config/sourcemaps-include-source/sourcemaps-include-source.less', 'map is produced (gated by test/alpha-sourcemaps.mjs) but its source-path normalization/embedded-sources do not byte-match the 4.x golden yet'],
     ['tests-config/sourcemaps-rootpath/sourcemaps-rootpath.less', 'map is produced (gated by test/alpha-sourcemaps.mjs) but its source-path normalization/embedded-sources do not byte-match the 4.x golden yet'],
-    ['tests-config/sourcemaps-url/sourcemaps-url.less', 'map is produced (gated by test/alpha-sourcemaps.mjs) but its source-path normalization/embedded-sources do not byte-match the 4.x golden yet'],
     ['tests-unit/mixins/mixins.less', 'same-named nested ruleset resolves the outer .recursion() mixin; remaining mismatch is fixture-local collapseNesting=false rendering'],
     ['tests-unit/property-name-interp/property-name-interp.less', 'deprecated dash-only @- and @{-} variable names are rejected'],
     ['tests-unit/plugin-module/plugin-module.less', 'legacy CommonJS @plugin graph with require() is not supported by the optional JS runtime'],
@@ -135,12 +134,9 @@ const expectedFailureDiagnosticCodes = new Map([
 ]);
 
 const expectedErrorPasses = new Map([
-    ['tests-error/eval/add-mixed-units.less', 'unit compatibility errors are not emitted yet'],
-    ['tests-error/eval/add-mixed-units2.less', 'unit compatibility errors are not emitted yet'],
+    ['tests-error/eval/ampersand-merge-template-invalid.less', 'accepted divergence: text prints as written (owner ruling 2026-10-09), so a merge template whose parent is escaped comma-list text renders that text instead of erroring'],
     ['tests-error/eval/color-func-invalid-color-2.less', 'color function argument errors are not emitted yet'],
     ['tests-error/eval/color-func-invalid-color.less', 'color function argument errors are not emitted yet'],
-    ['tests-error/eval/divide-mixed-units.less', 'unit compatibility errors are not emitted yet'],
-    ['tests-error/eval/multiply-mixed-units.less', 'unit compatibility errors are not emitted yet'],
     ['tests-error/eval/percentage-css-var.less', 'function argument type errors are not emitted yet'],
     ['tests-error/eval/percentage-non-number-argument.less', 'function argument type errors are not emitted yet'],
     ['tests-error/eval/svg-gradient1.less', 'svg-gradient argument validation errors are not emitted yet'],

packages/less/test/alpha-sourcemaps.mjs

@@ -143,11 +143,14 @@ function assertV3Map(json, { allowEmpty = false } = {}) {
   assert.match(css, /sourceMappingURL=flat\.css\.map/, 'flat sourceMapURL honored');
 }
 
-// 6. Empty input yields a v3 map (possibly empty) and never crashes.
+// 6. Empty output gets neither a map nor an annotation, and never crashes.
 {
-  const { map } = await less.render('', { sourceMap: true });
-  assert.ok(map, 'empty input still returns a map');
-  assertV3Map(map, { allowEmpty: true });
+  for (const sourceMap of [true, { sourceMapURL: 'empty.css.map' }, { sourceMapFileInline: true }]) {
+    const { css, map } = await less.render('', { sourceMap });
+    const label = JSON.stringify(sourceMap);
+    assert.equal(map, undefined, `empty output gets no map (${label})`);
+    assert.doesNotMatch(css, /sourceMappingURL/, `empty output gets no annotation (${label})`);
+  }
 }
 
 // 7. `outputSourceFiles` embeds the original source into sourcesContent.

packages/less/test/lessc-alpha.mjs

@@ -109,15 +109,15 @@ await realpath(compilerEntrypoint);
         );
     }
 
-    // 'native' distributes the child selector list (each branch keeps its own
-    // specificity); 'compact' folds it into a single :is().
-    const listNest = '.a, .b { .c, .d { x: 1 } }\n';
+    // 'native' groups child branches of equal specificity in one :is() and
+    // distributes branches of different specificity; 'compact' folds them all.
+    const listNest = '.a, .b { .c, #d { x: 1 } }\n';
     const nativeCss = (await less.render(listNest, { collapseNesting: 'native' })).css;
     assert.match(nativeCss, /:is\(\.a, \.b\) \.c/, "'native' distributes .c");
-    assert.match(nativeCss, /:is\(\.a, \.b\) \.d/, "'native' distributes .d");
-    assert.doesNotMatch(nativeCss, /:is\(\.c, \.d\)/, "'native' does not fold the child list");
+    assert.match(nativeCss, /:is\(\.a, \.b\) #d/, "'native' distributes #d");
+    assert.doesNotMatch(nativeCss, /:is\(\.c, #d\)/, "'native' keeps different specificities apart");
     const compactCss = (await less.render(listNest, { collapseNesting: 'compact' })).css;
-    assert.match(compactCss, /:is\(\.a, \.b\) :is\(\.c, \.d\)/, "'compact' folds the child list");
+    assert.match(compactCss, /:is\(\.a, \.b\) :is\(\.c, #d\)/, "'compact' folds the child list");
 
     const source = '.parent { before: 1; .child { inside: 2; } after: 3; }\n';
     assert.equal((await less.render(source)).css, `.parent {
@@ -310,8 +310,8 @@ try {
     assert.equal(sm.code, 0, sm.stderr);
     assert.match(sm.stdout, /lessc: wrote .+sm\.css\.map\n/, '--source-map reports the sidecar map it wrote');
     const smCss = await readFile(smOutput, 'utf8');
-    assert.match(smCss, /\/\*# sourceMappingURL=sm\.css\.map \*\/\n$/,
-        '--source-map annotates the CSS with the sidecar map basename');
+    assert.match(smCss, /\/\*# sourceMappingURL=sm\.css\.map \*\/$/,
+        '--source-map ends the CSS with the sidecar map annotation, no trailing newline');
     const smMap = JSON.parse(await readFile(`${smOutput}.map`, 'utf8'));
     assert.equal(smMap.version, 3, 'the sidecar map is source-map v3');
     assert.equal(smMap.file, 'sm.css', 'map.file is the CSS output name');