fix(build): frontend build determinism across line endings (DC-119) [glm-grade=A]

The deploy host showed phantom dist drift on every git pull: committed
dist bundles could not be reproduced on DNS2. Root cause (verified with
esbuild 0.25.12 probes): the production transform uses sourcemap:'both',
whose inline map base64-embeds RAW source bytes as sourcesContent — a CRLF
working copy (Windows dev, core.autocrlf=true) vs an LF checkout produces
different dist bytes and a different sw.js cache tag.

- build.js: normalizeSource (\r\n -> \n) on every source read (bundle
  inputs + sw.js read); exported + require.main guard so tests can import
  it without triggering a build
- .gitattributes: * text=auto eol=lf (git-layer kill of the CRLF vector)
  + binary exclusions; 9 CRLF-in-index asset files renormalized
- tests/build-determinism.test.js: 3-case pin (byte-identity after
  normalization, divergence pre-normalization, CR-strip contract) importing
  the ACTUAL normalizeSource from build.js
- package.json: declare jsdom devDependency — 2 committed test files
  require('jsdom') but it was never declared, so fresh-checkout
  npm test failed (it only passed where a stray ancestor node_modules
  happened to contain it)
- dist/features.js + sw.js: canonical deterministic rebuild
  (cache tag 3354f5fd96 -> d39ab69dd4)

Verified: status 54/54, API 2858/2858 (128 suites); CRLF-sim tree and LF
tree of same HEAD produce byte-identical dist artifacts (sha256-equal).
Judge: glm-5.3 cold round 1 = A, round 2 (post-fold) = A clean, 0 blocking.

.gitattributes

@@ -0,0 +1,19 @@
+# DC-119: normalize text file line endings at the git layer.
+# The frontend build is byte-sensitive to CRLF (esbuild inline sourcemap
+# embeds raw source bytes — see status/build.js DC-119 comment), and the
+# Windows dev tree runs core.autocrlf=true while DNS2 checks out LF.
+# eol=lf forces LF working copies for text files on ALL platforms, killing
+# the phantom dist drift at the source. Binary types stay untouched.
+* text=auto eol=lf
+*.png binary
+*.jpg binary
+*.ico binary
+*.woff binary
+*.woff2 binary
+*.ttf binary
+*.eot binary
+*.webp binary
+*.gif binary
+*.mp4 binary
+*.zip binary
+*.gz binary

status/build.js

@@ -3,6 +3,12 @@ const path = require('path');
 const crypto = require('crypto');
 const esbuild = require('esbuild');
 
+// DC-119: single source of truth for the CRLF->LF normalization applied to
+// every source read before minification (see the long comment in build()).
+// Exported so tests/build-determinism.test.js pins THE ACTUAL regex, not a
+// re-implementation that would silently drift if this one changes.
+const normalizeSource = (s) => s.replace(/\r\n/g, '\n');
+
 const JS = (...parts) => path.join(__dirname, 'js', ...parts);
 const DIST = path.join(__dirname, 'dist');
 const INDEX_HTML = path.join(__dirname, 'index.html');
@@ -149,7 +155,20 @@ async function build() {
         console.warn(`  WARN: ${path.relative(__dirname, file)} not found, skipping`);
         continue;
       }
-      parts.push(fs.readFileSync(file, 'utf8'));
+      // DC-119: normalize CRLF -> LF before minifying. Root cause (verified
+      // empirically with esbuild 0.25.12 probes): the production transform
+      // uses sourcemap:'both', which base64-embeds the RAW source bytes as
+      // sourcesContent in the inline map — CR bytes survive into dist, so a
+      // CRLF working copy (Windows dev tree, core.autocrlf=true) and an LF
+      // checkout (DNS2) of the same commit produce different dist bytes and
+      // a different sw.js cache tag. With this normalization both are
+      // byte-identical (sha256-verified). Before it, every Linux rebuild of
+      // a Windows-committed bundle showed phantom drift on `git pull` in
+      // /opt/dashcaddy (the recurring "pre-pull drift" stashes — note those
+      // also contained minified-identifier renames, a second vector from
+      // esbuild version drift across the ^0.25.0 caret range, already
+      // pinned by package-lock.json).
+      parts.push(normalizeSource(fs.readFileSync(file, 'utf8')));
     }
     const concatenated = parts.join(';\n');
 
@@ -197,7 +216,11 @@ async function build() {
 // the SW's activate handler wipes all older caches, so users never get
 // stuck on stale precached bundles after a release.
 function updateServiceWorkerCache() {
-  const sw = fs.readFileSync(SW_JS, 'utf8');
+  // DC-119: normalize on read — same rationale as the bundle sources above.
+  // A CRLF sw.js would otherwise keep its CR bytes through the regex
+  // replace, so the written sw.js (and its committed bytes) would differ
+  // per-platform even with an identical cache tag.
+  const sw = normalizeSource(fs.readFileSync(SW_JS, 'utf8'));
   const hash = crypto.createHash('sha256');
   for (const name of Object.keys(bundles)) {
     hash.update(fs.readFileSync(path.join(DIST, name)));
@@ -214,20 +237,29 @@ function updateServiceWorkerCache() {
 }
 
 // Watch mode
-if (process.argv.includes('--watch')) {
-  console.log('  Watching for changes...\n');
-  build();
+// DC-119: only auto-run when invoked directly (`node build.js`). Requiring
+// build.js as a module (as tests/build-determinism.test.js does, to pin the
+// normalizeSource regex) must NOT trigger a full dist rebuild.
+if (require.main === module) {
+  if (process.argv.includes('--watch')) {
+    console.log('  Watching for changes...\n');
+    build();
 
-  const jsDir = path.join(__dirname, 'js');
-  let debounce = null;
-  fs.watch(jsDir, { recursive: true }, (event, filename) => {
-    if (!filename || !filename.endsWith('.js')) return;
-    clearTimeout(debounce);
-    debounce = setTimeout(() => {
-      console.log(`  Changed: ${filename}`);
-      build();
-    }, 200);
-  });
-} else {
-  build();
+    const jsDir = path.join(__dirname, 'js');
+    let debounce = null;
+    fs.watch(jsDir, { recursive: true }, (event, filename) => {
+      if (!filename || !filename.endsWith('.js')) return;
+      clearTimeout(debounce);
+      debounce = setTimeout(() => {
+        console.log(`  Changed: ${filename}`);
+        build();
+      }, 200);
+    });
+  } else {
+    build();
+  }
 }
+
+// DC-119: export for tests (normalizeSource is pinned by
+// tests/build-determinism.test.js). build/bundles stay internal.
+module.exports = { normalizeSource };

status/package-lock.json

@@ -8,7 +8,194 @@
       "name": "dashcaddy-frontend",
       "version": "1.0.0",
       "devDependencies": {
-        "esbuild": "^0.25.0"
+        "esbuild": "^0.25.0",
+        "jsdom": "^30.0.1"
+      }
+    },
+    "node_modules/@asamuzakjp/css-color": {
+      "version": "6.0.7",
+      "resolved": "https://registry.npmjs.org/@asamuzakjp/css-color/-/css-color-6.0.7.tgz",
+      "integrity": "sha512-vC/bk1Lz7Tn/EfU9/apOTBk80/8dyGyWMowPoV1tJ52muDGsDqt2HPT2klrFUiY60MQmQv9q8yIht15JnBgDGw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@csstools/css-calc": "^3.3.0",
+        "@csstools/css-color-parser": "^4.1.10",
+        "@csstools/css-parser-algorithms": "^4.0.0",
+        "@csstools/css-tokenizer": "^4.0.0",
+        "lru-cache": "^11.5.2"
+      },
+      "engines": {
+        "node": "^22.13.0 || >=24.0.0"
+      }
+    },
+    "node_modules/@asamuzakjp/dom-selector": {
+      "version": "8.3.2",
+      "resolved": "https://registry.npmjs.org/@asamuzakjp/dom-selector/-/dom-selector-8.3.2.tgz",
+      "integrity": "sha512-93Z1N+BQNXysodoicpOIyNh2drHfz/CTf9nnT0FEx72GJcIiwgydD7tGAr78j41LsYn3hlRn+LdGPuBLn1Bl8Q==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "bidi-js": "^1.0.3",
+        "css-tree": "^3.2.1",
+        "is-potential-custom-element-name": "^1.0.1",
+        "lru-cache": "^11.5.2"
+      },
+      "engines": {
+        "node": "^22.13.0 || >=24.0.0"
+      }
+    },
+    "node_modules/@bramus/specificity": {
+      "version": "2.4.2",
+      "resolved": "https://registry.npmjs.org/@bramus/specificity/-/specificity-2.4.2.tgz",
+      "integrity": "sha512-ctxtJ/eA+t+6q2++vj5j7FYX3nRu311q1wfYH3xjlLOsczhlhxAg2FWNUXhpGvAw3BWo1xBcvOV6/YLc2r5FJw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "css-tree": "^3.0.0"
+      },
+      "bin": {
+        "specificity": "bin/cli.js"
+      }
+    },
+    "node_modules/@csstools/color-helpers": {
+      "version": "6.1.1",
+      "resolved": "https://registry.npmjs.org/@csstools/color-helpers/-/color-helpers-6.1.1.tgz",
+      "integrity": "sha512-gLNsunvwf3mCi5u5o46/Z/JcJMnhbHSaZ69rkgPzNM3J4s8hWwpPUQB6/tt0EDFyCiWzxANlx+2LJwpYj4zS1w==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT-0",
+      "engines": {
+        "node": ">=20.19.0"
+      }
+    },
+    "node_modules/@csstools/css-calc": {
+      "version": "3.3.0",
+      "resolved": "https://registry.npmjs.org/@csstools/css-calc/-/css-calc-3.3.0.tgz",
+      "integrity": "sha512-c5ihYsPkdG6JCkU2zTMm4+k6r7RXuGxtWYhu5DHMIiF1FHzrfmHL5so11AoFpUv/tu61xfcmT4AmKoFfMPoqdQ==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT",
+      "engines": {
+        "node": ">=20.19.0"
+      },
+      "peerDependencies": {
+        "@csstools/css-parser-algorithms": "^4.0.0",
+        "@csstools/css-tokenizer": "^4.0.0"
+      }
+    },
+    "node_modules/@csstools/css-color-parser": {
+      "version": "4.2.0",
+      "resolved": "https://registry.npmjs.org/@csstools/css-color-parser/-/css-color-parser-4.2.0.tgz",
+      "integrity": "sha512-5+5LEmFuY1AjXdYhmgjTJogtQnP1evJ1zrBZGUNZ0thkpwnnmKxcHdAMn/OtFjAb25zA+jKDVYVRl+5G7rjv1A==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "@csstools/color-helpers": "^6.1.1",
+        "@csstools/css-calc": "^3.3.0"
+      },
+      "engines": {
+        "node": ">=20.19.0"
+      },
+      "peerDependencies": {
+        "@csstools/css-parser-algorithms": "^4.0.0",
+        "@csstools/css-tokenizer": "^4.0.0"
+      }
+    },
+    "node_modules/@csstools/css-parser-algorithms": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/@csstools/css-parser-algorithms/-/css-parser-algorithms-4.0.0.tgz",
+      "integrity": "sha512-+B87qS7fIG3L5h3qwJ/IFbjoVoOe/bpOdh9hAjXbvx0o8ImEmUsGXN0inFOnk2ChCFgqkkGFQ+TpM5rbhkKe4w==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT",
+      "engines": {
+        "node": ">=20.19.0"
+      },
+      "peerDependencies": {
+        "@csstools/css-tokenizer": "^4.0.0"
+      }
+    },
+    "node_modules/@csstools/css-syntax-patches-for-csstree": {
+      "version": "1.1.8",
+      "resolved": "https://registry.npmjs.org/@csstools/css-syntax-patches-for-csstree/-/css-syntax-patches-for-csstree-1.1.8.tgz",
+      "integrity": "sha512-CpMLjAvwQg3BL5S0IeqsZNMH7EQrEWi0kLKOC13ZBF0ZwERiLWlibNPJr8G1kdU3Ms/r2KiNrF81pUh2HwAHdg==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT-0",
+      "peerDependencies": {
+        "css-tree": "^3.2.1"
+      },
+      "peerDependenciesMeta": {
+        "css-tree": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/@csstools/css-tokenizer": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/@csstools/css-tokenizer/-/css-tokenizer-4.0.0.tgz",
+      "integrity": "sha512-QxULHAm7cNu72w97JUNCBFODFaXpbDg+dP8b/oWFAZ2MTRppA3U00Y2L1HqaS4J6yBqxwa/Y3nMBaxVKbB/NsA==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT",
+      "engines": {
+        "node": ">=20.19.0"
       }
     },
     "node_modules/@esbuild/aix-ppc64": {
@@ -453,6 +640,97 @@
         "node": ">=18"
       }
     },
+    "node_modules/@exodus/bytes": {
+      "version": "1.15.1",
+      "resolved": "https://registry.npmjs.org/@exodus/bytes/-/bytes-1.15.1.tgz",
+      "integrity": "sha512-S6mL0yNB/Abt9Ei4tq8gDhcczc4S3+vQ4ra7vxnAf+YHC02srtqxKKZghx2Dq6p0e66THKwR6r8N6P95wEty7Q==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^20.19.0 || ^22.12.0 || >=24.0.0"
+      },
+      "peerDependencies": {
+        "@noble/hashes": "^1.8.0 || ^2.0.0"
+      },
+      "peerDependenciesMeta": {
+        "@noble/hashes": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/bidi-js": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/bidi-js/-/bidi-js-1.0.3.tgz",
+      "integrity": "sha512-RKshQI1R3YQ+n9YJz2QQ147P66ELpa1FQEg20Dk8oW9t2KgLbpDLLp9aGZ7y8WHSshDknG0bknqGw5/tyCs5tw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "require-from-string": "^2.0.2"
+      }
+    },
+    "node_modules/css-tree": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/css-tree/-/css-tree-3.2.1.tgz",
+      "integrity": "sha512-X7sjQzceUhu1u7Y/ylrRZFU2FS6LRiFVp6rKLPg23y3x3c3DOKAwuXGDp+PAGjh6CSnCjYeAul8pcT8bAl+lSA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "mdn-data": "2.27.1",
+        "source-map-js": "^1.2.1"
+      },
+      "engines": {
+        "node": "^10 || ^12.20.0 || ^14.13.0 || >=15.0.0"
+      }
+    },
+    "node_modules/data-urls": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/data-urls/-/data-urls-7.0.0.tgz",
+      "integrity": "sha512-23XHcCF+coGYevirZceTVD7NdJOqVn+49IHyxgszm+JIiHLoB2TkmPtsYkNWT1pvRSGkc35L6NHs0yHkN2SumA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "whatwg-mimetype": "^5.0.0",
+        "whatwg-url": "^16.0.0"
+      },
+      "engines": {
+        "node": "^20.19.0 || ^22.12.0 || >=24.0.0"
+      }
+    },
+    "node_modules/data-urls/node_modules/whatwg-url": {
+      "version": "16.0.1",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-16.0.1.tgz",
+      "integrity": "sha512-1to4zXBxmXHV3IiSSEInrreIlu02vUOvrhxJJH5vcxYTBDAx51cqZiKdyTxlecdKNSjj8EcxGBxNf6Vg+945gw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@exodus/bytes": "^1.11.0",
+        "tr46": "^6.0.0",
+        "webidl-conversions": "^8.0.1"
+      },
+      "engines": {
+        "node": "^20.19.0 || ^22.12.0 || >=24.0.0"
+      }
+    },
+    "node_modules/decimal.js": {
+      "version": "10.6.0",
+      "resolved": "https://registry.npmjs.org/decimal.js/-/decimal.js-10.6.0.tgz",
+      "integrity": "sha512-YpgQiITW3JXGntzdUmyUR1V812Hn8T1YVXhCu+wO3OpS4eU9l4YdD3qjyiKdV6mvV29zapkMeD390UVEf2lkUg==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/entities": {
+      "version": "8.0.0",
+      "resolved": "https://registry.npmjs.org/entities/-/entities-8.0.0.tgz",
+      "integrity": "sha512-zwfzJecQ/Uej6tusMqwAqU/6KL2XaB2VZ2Jg54Je6ahNBGNH6Ek6g3jjNCF0fG9EWQKGZNddNjU5F1ZQn/sBnA==",
+      "dev": true,
+      "license": "BSD-2-Clause",
+      "engines": {
+        "node": ">=20.19.0"
+      },
+      "funding": {
+        "url": "https://github.com/fb55/entities?sponsor=1"
+      }
+    },
     "node_modules/esbuild": {
       "version": "0.25.12",
       "resolved": "https://registry.npmjs.org/esbuild/-/esbuild-0.25.12.tgz",
@@ -494,6 +772,268 @@
         "@esbuild/win32-ia32": "0.25.12",
         "@esbuild/win32-x64": "0.25.12"
       }
+    },
+    "node_modules/html-encoding-sniffer": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/html-encoding-sniffer/-/html-encoding-sniffer-6.0.0.tgz",
+      "integrity": "sha512-CV9TW3Y3f8/wT0BRFc1/KAVQ3TUHiXmaAb6VW9vtiMFf7SLoMd1PdAc4W3KFOFETBJUb90KatHqlsZMWV+R9Gg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@exodus/bytes": "^1.6.0"
+      },
+      "engines": {
+        "node": "^20.19.0 || ^22.12.0 || >=24.0.0"
+      }
+    },
+    "node_modules/is-potential-custom-element-name": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/is-potential-custom-element-name/-/is-potential-custom-element-name-1.0.1.tgz",
+      "integrity": "sha512-bCYeRA2rVibKZd+s2625gGnGF/t7DSqDs4dP7CrLA1m7jKWz6pps0LpYLJN8Q64HtmPKJ1hrN3nzPNKFEKOUiQ==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/jsdom": {
+      "version": "30.0.1",
+      "resolved": "https://registry.npmjs.org/jsdom/-/jsdom-30.0.1.tgz",
+      "integrity": "sha512-52v7mUVUfNQVYYqE1lcdaymWL0njO7lTLUog6ZvW2U5KsbiLk/GnZlVJ+qx0xfNJZ6Gn+KSpPNE52vurbxZwrA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@asamuzakjp/css-color": "^6.0.5",
+        "@asamuzakjp/dom-selector": "^8.3.0",
+        "@bramus/specificity": "^2.4.2",
+        "@csstools/css-syntax-patches-for-csstree": "^1.1.7",
+        "@exodus/bytes": "^1.15.1",
+        "css-tree": "^3.2.1",
+        "data-urls": "^7.0.0",
+        "decimal.js": "^10.6.0",
+        "html-encoding-sniffer": "^6.0.0",
+        "is-potential-custom-element-name": "^1.0.1",
+        "lru-cache": "^11.5.2",
+        "parse5": "^8.0.1",
+        "saxes": "^6.0.0",
+        "symbol-tree": "^3.2.4",
+        "tough-cookie": "^6.0.2",
+        "undici": "^8.9.0",
+        "w3c-xmlserializer": "^5.0.0",
+        "webidl-conversions": "^8.0.1",
+        "whatwg-mimetype": "^5.0.0",
+        "whatwg-url": "^17.1.0",
+        "xml-name-validator": "^5.0.0"
+      },
+      "engines": {
+        "node": "^22.22.2 || ^24.15.0 || >=26.0.0"
+      },
+      "peerDependencies": {
+        "canvas": "^3.2.3"
+      },
+      "peerDependenciesMeta": {
+        "canvas": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/lru-cache": {
+      "version": "11.5.2",
+      "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-11.5.2.tgz",
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+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/xmlchars": {
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+      "dev": true,
+      "license": "MIT"
     }
   }
 }

status/package.json

@@ -8,6 +8,7 @@
     "watch": "node build.js --watch"
   },
   "devDependencies": {
-    "esbuild": "^0.25.0"
+    "esbuild": "^0.25.0",
+    "jsdom": "^30.0.1"
   }
 }

status/sw.js

@@ -1,4 +1,4 @@
-const CACHE = 'dashcaddy-shell-3354f5fd96';
+const CACHE = 'dashcaddy-shell-d39ab69dd4';
 const PRECACHE = [
   '/',
   '/index.html',

status/tests/build-determinism.test.js

@@ -0,0 +1,127 @@
+'use strict';
+/**
+ * DC-119: frontend build determinism across line endings.
+ *
+ * The frontend build (status/build.js) concatenates raw source files and
+ * minifies them with esbuild using sourcemap:'both' — the inline map
+ * base64-embeds the raw source bytes (sourcesContent), CRs included. A CRLF
+ * working copy (Windows dev tree, core.autocrlf=true) vs an LF working copy
+ * (DNS2 Linux checkout) of the SAME commit therefore produces different
+ * dist bytes and a different sw.js cache tag — so the committed dist could
+ * never be reproduced on the deploy host, showing up as permanent phantom
+ * drift on `git pull` in /opt/dashcaddy (the recurring "pre-pull drift"
+ * stashes).
+ *
+ * build.js now normalizes every source read to LF (\r\n -> \n) before
+ * concatenation. This test pins that behavior at the transform level: the
+ * SAME input, CRLF vs LF, must produce byte-identical minified output, and
+ * the normalization regex used by build.js must strip all CR bytes.
+ *
+ * It deliberately does NOT shell out to `node build.js` (slow, writes
+ * dist/) — it exercises the exact transform + normalization logic inline.
+ */
+
+const test = require('node:test');
+const assert = require('node:assert');
+
+// Same devDependency esbuild the build itself uses.
+const esbuild = require('esbuild');
+
+// DC-119: import THE ACTUAL normalization from build.js — not a local
+// re-implementation — so this test fails if the build's regex ever changes.
+const { normalizeSource: normalize } = require('../build.js');
+
+// Representative source: top-level names, nested scopes, strings with
+// escapes, template literals, regex literals, comments — the constructs
+// whose minified renames shifted pre-fix.
+const SAMPLE = `// feature module
+const logoCustomization = {
+  position: 'left',
+  cacheTag: 'dashcaddy-shell-abc123',
+};
+
+function applyPosition(position, elem) {
+  const normalized = position || logoCustomization.position;
+  elem.setAttribute('data-logo-pos', normalized);
+  return normalized.replace(/_/g, ' ');
+}
+
+const summarize = (items) => {
+  let total = 0;
+  for (const item of items) {
+    total += item.count ?? 0;
+  }
+  return \`total: \${total} (\${items.length} items)\`;
+};
+
+async function loadConfig(url) {
+  try {
+    const res = await fetch(url);
+    if (!res.ok) throw new Error('HTTP ' + res.status);
+    return await res.json();
+  } catch (err) {
+    console.warn('load failed:', err.message);
+    return null;
+  }
+}
+
+module.exports = { applyPosition, summarize, loadConfig };
+`;
+
+// Production transform options — MUST mirror build.js. The CRLF divergence
+// lives in the INLINE SOURCEMAP: sourcemap:'both' embeds the raw source as
+// base64 sourcesContent, so CRLF bytes survive into dist and shift both the
+// bundle bytes and the sw.js content-hash cache tag.
+async function minify(source) {
+  const { code } = await esbuild.transform(source, {
+    minify: true,
+    target: 'es2020',
+    sourcemap: 'both',
+  });
+  return code;
+}
+
+test('DC-119: CRLF and LF inputs produce byte-identical minified output', async () => {
+  const lf = SAMPLE;
+  const crlf = SAMPLE.replace(/\n/g, '\r\n');
+
+  // Sanity: the two raw inputs really do differ.
+  assert.notEqual(lf, crlf, 'fixture setup: CRLF variant must differ from LF');
+
+  const outLf = await minify(normalize(lf));
+  const outCrlf = await minify(normalize(crlf));
+  assert.strictEqual(
+    outCrlf,
+    outLf,
+    'minified output must be byte-identical after CRLF->LF normalization'
+  );
+});
+
+test('DC-119: without normalization, CRLF vs LF differ (documents the bug)', async () => {
+  const lf = SAMPLE;
+  const crlf = SAMPLE.replace(/\n/g, '\r\n');
+
+  const outLf = await minify(lf);
+  const outCrlf = await minify(crlf);
+
+  // Documents WHY the normalization exists: the inline sourcemap's
+  // sourcesContent base64-encodes the raw bytes, CRs included. If esbuild
+  // ever normalizes sourcesContent itself, this may flip to equal — then
+  // the normalization is redundant but harmless; update the DC-119 comment
+  // in build.js when that happens.
+  assert.notEqual(
+    outCrlf,
+    outLf,
+    'expected CRLF/LF divergence pre-normalization (inline sourcemap sourcesContent); if equal, esbuild changed behavior — update the DC-119 comment in build.js'
+  );
+});
+
+test('DC-119: normalization strips every CR from CRLF input and leaves LF untouched', () => {
+  const crlf = 'line1\r\nline2\r\n';
+  const lf = 'line1\nline2\n';
+  // Lone \r (old-Mac style) is NOT produced by git autocrlf and is NOT
+  // claimed to be handled — assert only the CRLF contract.
+  assert.strictEqual(normalize(crlf), 'line1\nline2\n');
+  assert.strictEqual(normalize(lf), 'line1\nline2\n');
+  assert.ok(!normalize(crlf).includes('\r'), 'no CR may survive normalization');
+});