Fix theme-auto loading (#23504)

Fix regression from https://github.com/go-gitea/gitea/pull/23481.

The conditional on the CSS import was being stripped away by webpack's
`css-loader`, resulting in the dark theme always loading. The old syntax
with `@import` nested inside `@media` also did not work as `css-loader`
(rightfully) ignores such non-standard `@import` syntax that was
previously supported by Less.

Unfortunately, we have to re-introduce postcss to the CSS pipeline to
fix this and I loaded only the minimal plugins to make it work.

There is one variant of the fix that does work without postcss, which is
to exclude the file from transpilation but I did not consider it as it
would have meant the `@import` was being done without a version suffix
in the URL, which would have caused cache issue.

Related: https://github.com/webpack-contrib/css-loader/issues/1503

---------

Co-authored-by: John Olheiser <john.olheiser@gmail.com>

package-lock.json

@@ -33,6 +33,9 @@
         "mini-css-extract-plugin": "2.7.2",
         "monaco-editor": "0.34.1",
         "monaco-editor-webpack-plugin": "7.0.1",
+        "postcss-import": "15.1.0",
+        "postcss-loader": "7.0.2",
+        "postcss-url": "10.1.3",
         "pretty-ms": "8.0.0",
         "sortablejs": "1.15.0",
         "swagger-ui-dist": "4.15.5",
@@ -82,7 +85,6 @@
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       "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.18.6.tgz",
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-      "dev": true,
       "dependencies": {
         "@babel/highlight": "^7.18.6"
       },
@@ -94,7 +96,6 @@
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       "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.19.1.tgz",
       "integrity": "sha512-awrNfaMtnHUr653GgGEs++LlAvW6w+DcPrOliSMXWCKo597CwL5Acf/wWdNkf/tfEQE3mjkeD1YOVZOUV/od1w==",
-      "dev": true,
       "engines": {
         "node": ">=6.9.0"
       }
@@ -103,7 +104,6 @@
       "version": "7.18.6",
       "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.18.6.tgz",
       "integrity": "sha512-u7stbOuYjaPezCuLj29hNW1v64M2Md2qupEKP1fHc7WdOA3DgLh37suiSrZYY7haUB7iBeQZ9P1uiRF359do3g==",
-      "dev": true,
       "dependencies": {
         "@babel/helper-validator-identifier": "^7.18.6",
         "chalk": "^2.0.0",
@@ -117,7 +117,6 @@
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       "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
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-      "dev": true,
       "dependencies": {
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@@ -129,7 +128,6 @@
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       "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
       "integrity": "sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==",
-      "dev": true,
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         "escape-string-regexp": "^1.0.5",
@@ -143,7 +141,6 @@
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-      "dev": true,
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@@ -151,14 +148,12 @@
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       "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.3.tgz",
-      "integrity": "sha512-72fSenhMw2HZMTVHeCA9KCmpEIbzWiQsjN+BHcBbS9vr1mtt+vJjPdksIBNUmKAW8TFUDPJK5SUU3QhE9NEXDw==",
+      "integrity": "sha512-72fSenhMw2HZMTVHeCA9KCmpEIbzWiQsjN+BHcBbS9vr1mtt+vJjPdksIBNUmKAW8TFUDPJK5SUU3QhE9NEXDw=="
-      "dev": true
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     "node_modules/@babel/highlight/node_modules/escape-string-regexp": {
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       "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz",
       "integrity": "sha512-vbRorB5FUQWvla16U8R/qgaFIya2qGzwDrNmCZuYKrbdSUMG6I1ZCGQRefkRVhuOkIGVne7BQ35DSfo1qvJqFg==",
-      "dev": true,
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@@ -167,7 +162,6 @@
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-      "dev": true,
       "engines": {
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@@ -176,7 +170,6 @@
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-      "dev": true,
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@@ -1570,6 +1563,11 @@
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       "dev": true
     },
+    "node_modules/@types/parse-json": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/@types/parse-json/-/parse-json-4.0.0.tgz",
+      "integrity": "sha512-//oorEZjL6sbPcKUaCdIGlIUeH26mgzimjBB77G6XRgnDl/L5wOnpyBGRe/Mmf5CVW3PwEBE1NjiMZ/ssFh4wA=="
+    },
     "node_modules/@types/tern": {
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       "resolved": "https://registry.npmjs.org/@types/tern/-/tern-0.23.4.tgz",
@@ -2400,7 +2398,6 @@
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-      "dev": true,
       "engines": {
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@@ -2896,6 +2893,11 @@
       "resolved": "https://registry.npmjs.org/csstype/-/csstype-3.1.1.tgz",
       "integrity": "sha512-DJR/VvkAvSZW9bTouZue2sSxDwdTN92uHjqeKVm+0dAqdfNykRzQ95tay8aXMBAAPpUiq4Qcug2L7neoRh2Egw=="
     },
+    "node_modules/cuint": {
+      "version": "0.2.2",
+      "resolved": "https://registry.npmjs.org/cuint/-/cuint-0.2.2.tgz",
+      "integrity": "sha512-d4ZVpCW31eWwCMe1YT3ur7mUDnTXbgwyzaL320DrcRT45rfjYxkt5QWLrmOJ+/UEAI2+fQgKe/fCjR8l4TpRgw=="
+    },
     "node_modules/cytoscape": {
       "version": "3.23.0",
       "resolved": "https://registry.npmjs.org/cytoscape/-/cytoscape-3.23.0.tgz",
@@ -3827,7 +3829,6 @@
       "version": "1.3.2",
       "resolved": "https://registry.npmjs.org/error-ex/-/error-ex-1.3.2.tgz",
       "integrity": "sha512-7dFHNmqeFSEt2ZBsCriorKnn3Z2pj+fd9kmI6QoWw4//DL+icEBfc0U7qJCisqrTsKTjw4fNFy2pW9OqStD84g==",
-      "dev": true,
       "dependencies": {
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       }
@@ -5266,7 +5267,6 @@
       "version": "3.3.0",
       "resolved": "https://registry.npmjs.org/import-fresh/-/import-fresh-3.3.0.tgz",
       "integrity": "sha512-veYYhQa+D1QBKznvhUHxb8faxlrwUnxseDAbAp457E0wLNio2bOSKnjYDhMj+YiAq61xrMGhQk9iXVk5FzgQMw==",
-      "dev": true,
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         "parent-module": "^1.0.0",
         "resolve-from": "^4.0.0"
@@ -5399,8 +5399,7 @@
     "node_modules/is-arrayish": {
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       "resolved": "https://registry.npmjs.org/is-arrayish/-/is-arrayish-0.2.1.tgz",
-      "integrity": "sha512-zz06S8t0ozoDXMG+ube26zeCTNXcKIPJZJi8hBrF4idCLms4CG9QtK7qBl1boi5ODzFpjswb5JPmHCbMpjaYzg==",
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-      "dev": true
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     "node_modules/is-bigint": {
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@@ -5767,8 +5766,7 @@
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-      "integrity": "sha512-RdJUflcE3cUzKiMqQgsCu06FPu9UdIJO0beYbPhHN4k6apgJtifcoCtT9bcxOpYBtpD2kCM6Sbzg4CausW/PKQ==",
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-      "dev": true
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     "node_modules/js-yaml": {
       "version": "4.1.0",
@@ -5940,6 +5938,14 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/klona": {
+      "version": "2.0.6",
+      "resolved": "https://registry.npmjs.org/klona/-/klona-2.0.6.tgz",
+      "integrity": "sha512-dhG34DXATL5hSxJbIexCft8FChFXtmskoZYnoPWjXQuebWYCNkVeV3KkGegCK9CP1oswI/vQibS2GY7Em/sJJA==",
+      "engines": {
+        "node": ">= 8"
+      }
+    },
     "node_modules/known-css-properties": {
       "version": "0.26.0",
       "resolved": "https://registry.npmjs.org/known-css-properties/-/known-css-properties-0.26.0.tgz",
@@ -6044,8 +6050,7 @@
     "node_modules/lines-and-columns": {
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@@ -6999,7 +7004,6 @@
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-      "dev": true,
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@@ -7011,7 +7015,6 @@
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@@ -7104,7 +7107,6 @@
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-      "dev": true,
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@@ -7286,6 +7288,58 @@
         "node": "^10 || ^12 || >=14"
       }
     },
+    "node_modules/postcss-import": {
+      "version": "15.1.0",
+      "resolved": "https://registry.npmjs.org/postcss-import/-/postcss-import-15.1.0.tgz",
+      "integrity": "sha512-hpr+J05B2FVYUAXHeK1YyI267J/dDDhMU6B6civm8hSY1jYJnBXxzKDKDswzJmtLHryrjhnDjqqp/49t8FALew==",
+      "dependencies": {
+        "postcss-value-parser": "^4.0.0",
+        "read-cache": "^1.0.0",
+        "resolve": "^1.1.7"
+      },
+      "engines": {
+        "node": ">=14.0.0"
+      },
+      "peerDependencies": {
+        "postcss": "^8.0.0"
+      }
+    },
+    "node_modules/postcss-loader": {
+      "version": "7.0.2",
+      "resolved": "https://registry.npmjs.org/postcss-loader/-/postcss-loader-7.0.2.tgz",
+      "integrity": "sha512-fUJzV/QH7NXUAqV8dWJ9Lg4aTkDCezpTS5HgJ2DvqznexTbSTxgi/dTECvTZ15BwKTtk8G/bqI/QTu2HPd3ZCg==",
+      "dependencies": {
+        "cosmiconfig": "^7.0.0",
+        "klona": "^2.0.5",
+        "semver": "^7.3.8"
+      },
+      "engines": {
+        "node": ">= 14.15.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/webpack"
+      },
+      "peerDependencies": {
+        "postcss": "^7.0.0 || ^8.0.1",
+        "webpack": "^5.0.0"
+      }
+    },
+    "node_modules/postcss-loader/node_modules/cosmiconfig": {
+      "version": "7.1.0",
+      "resolved": "https://registry.npmjs.org/cosmiconfig/-/cosmiconfig-7.1.0.tgz",
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+      "dependencies": {
+        "@types/parse-json": "^4.0.0",
+        "import-fresh": "^3.2.1",
+        "parse-json": "^5.0.0",
+        "path-type": "^4.0.0",
+        "yaml": "^1.10.0"
+      },
+      "engines": {
+        "node": ">=10"
+      }
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@@ -7381,6 +7435,67 @@
         "node": ">=4"
       }
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+    "node_modules/postcss-url": {
+      "version": "10.1.3",
+      "resolved": "https://registry.npmjs.org/postcss-url/-/postcss-url-10.1.3.tgz",
+      "integrity": "sha512-FUzyxfI5l2tKmXdYc6VTu3TWZsInayEKPbiyW+P6vmmIrrb4I6CGX0BFoewgYHLK+oIL5FECEK02REYRpBvUCw==",
+      "dependencies": {
+        "make-dir": "~3.1.0",
+        "mime": "~2.5.2",
+        "minimatch": "~3.0.4",
+        "xxhashjs": "~0.2.2"
+      },
+      "engines": {
+        "node": ">=10"
+      },
+      "peerDependencies": {
+        "postcss": "^8.0.0"
+      }
+    },
+    "node_modules/postcss-url/node_modules/make-dir": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/make-dir/-/make-dir-3.1.0.tgz",
+      "integrity": "sha512-g3FeP20LNwhALb/6Cz6Dd4F2ngze0jz7tbzrD2wAV+o9FeNHe4rL+yK2md0J/fiSf1sa1ADhXqi5+oVwOM/eGw==",
+      "dependencies": {
+        "semver": "^6.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/postcss-url/node_modules/mime": {
+      "version": "2.5.2",
+      "resolved": "https://registry.npmjs.org/mime/-/mime-2.5.2.tgz",
+      "integrity": "sha512-tqkh47FzKeCPD2PUiPB6pkbMzsCasjxAfC62/Wap5qrUWcb+sFasXUC5I3gYM5iBM8v/Qpn4UK0x+j0iHyFPDg==",
+      "bin": {
+        "mime": "cli.js"
+      },
+      "engines": {
+        "node": ">=4.0.0"
+      }
+    },
+    "node_modules/postcss-url/node_modules/minimatch": {
+      "version": "3.0.8",
+      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.0.8.tgz",
+      "integrity": "sha512-6FsRAQsxQ61mw+qP1ZzbL9Bc78x2p5OqNgNpnoAFLTrX8n5Kxph0CsnhmKKNXTWjXqU5L0pGPR7hYk+XWZr60Q==",
+      "dependencies": {
+        "brace-expansion": "^1.1.7"
+      },
+      "engines": {
+        "node": "*"
+      }
+    },
+    "node_modules/postcss-url/node_modules/semver": {
+      "version": "6.3.0",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
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+      "bin": {
+        "semver": "bin/semver.js"
+      }
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       "resolved": "https://registry.npmjs.org/postcss-value-parser/-/postcss-value-parser-4.2.0.tgz",
@@ -7554,6 +7669,22 @@
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+    "node_modules/read-cache": {
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+      "resolved": "https://registry.npmjs.org/read-cache/-/read-cache-1.0.0.tgz",
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+      "dependencies": {
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+      }
+    },
+    "node_modules/read-cache/node_modules/pify": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/pify/-/pify-2.3.0.tgz",
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+      "engines": {
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+      }
+    },
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-      "dev": true,
       "engines": {
         "node": ">=4"
       }
@@ -9935,6 +10065,14 @@
         "node": "*"
       }
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+    "node_modules/xxhashjs": {
+      "version": "0.2.2",
+      "resolved": "https://registry.npmjs.org/xxhashjs/-/xxhashjs-0.2.2.tgz",
+      "integrity": "sha512-AkTuIuVTET12tpsVIQo+ZU6f/qDmKuRUcjaqR+OIvm+aCBsZ95i7UVY5WJ9TMsSaZ0DA2WxoZ4acu0sPH+OKAw==",
+      "dependencies": {
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+      }
+    },
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@@ -9950,6 +10088,14 @@
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       "dev": true
     },
+    "node_modules/yaml": {
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@@ -15362,6 +15538,45 @@
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@@ -15495,6 +15710,21 @@
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package.json

@@ -33,6 +33,9 @@
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+    "postcss-loader": "7.0.2",
+    "postcss-url": "10.1.3",
     "pretty-ms": "8.0.0",
     "sortablejs": "1.15.0",
     "swagger-ui-dist": "4.15.5",

web_src/css/themes/theme-auto.css

@@ -1 +1,2 @@
+/* This import requires postcss-import so the media query is preserved in the output */
 @import "./theme-arc-green.css" (prefers-color-scheme: dark);

webpack.config.js

@@ -145,10 +145,23 @@ export default {
             loader: 'css-loader',
             options: {
               sourceMap: true,
+              importLoaders: 1,
               url: {filter: filterCssImport},
               import: {filter: filterCssImport},
             },
           },
+          {
+            loader: 'postcss-loader', /* for conditional import in theme-auto.css */
+            options: {
+              sourceMap: true,
+              postcssOptions: {
+                plugins: [
+                  'postcss-import',
+                  'postcss-url',
+                ],
+              },
+            },
+          },
         ],
       },
       {