fix: fix problem with missing worker in compiled version

Author: Aeolun

.claude/settings.local.json

@@ -8,7 +8,12 @@
       "Bash(pnpm test:*)",
       "Bash(CI=1 pnpm test:*)",
       "Bash(CI=1 npm test:*)",
-      "Bash(pnpm remove:*)"
+      "Bash(pnpm remove:*)",
+      "Bash(npm test:*)",
+      "Bash(npx tsc:*)",
+      "Bash(ls:*)",
+      "Bash(pnpm run build:*)",
+      "Bash(pnpm exec vitest:*)"
     ],
     "deny": [],
     "ask": []

package.json

@@ -31,7 +31,7 @@
   "module": "lib/esm/src/index",
   "typings": "lib/cjs/src/index",
   "scripts": {
-    "build": "tsc --project tsconfig.json && tsc --project tsconfig.esm.json",
+    "build": "tsc --project tsconfig.json && tsc --project tsconfig.esm.json && sed -i 's/computeWorker\\.ts/computeWorker.js/g' lib/cjs/src/compute-lines.js lib/esm/src/compute-lines.js",
     "build:examples": "vite build examples",
     "publish:examples": "NODE_ENV=production pnpm run build:examples && gh-pages -d examples/dist -r $GITHUB_REPO_URL",
     "publish:examples:local": "NODE_ENV=production pnpm run build:examples && gh-pages -d examples/dist",

src/compute-lines.ts

@@ -652,24 +652,32 @@ const computeLineInformationWorker = (
   showLines: string[] = [],
   deferWordDiff = false
 ): Promise<ComputedLineInformation> => {
+  const fallback = () => computeLineInformation(oldString, newString, disableWordDiff, lineCompareMethod, linesOffset, showLines, deferWordDiff);
+
   // Fall back to synchronous computation if Worker is not available (e.g., in Node.js/test environments)
   if (typeof Worker === 'undefined') {
-    return Promise.resolve(
-      computeLineInformation(oldString, newString, disableWordDiff, lineCompareMethod, linesOffset, showLines, deferWordDiff)
-    );
+    return Promise.resolve(fallback());
   }
 
-  return new Promise((resolve, reject) => {
-    const worker = new Worker(new URL('./computeWorker.ts', import.meta.url), { type: 'module' });
+  return new Promise((resolve) => {
+    let worker: Worker;
+    try {
+      worker = new Worker(new URL('./computeWorker.ts', import.meta.url), { type: 'module' });
+    } catch {
+      // Worker instantiation failed - fall back to synchronous computation
+      resolve(fallback());
+      return;
+    }
 
     worker.onmessage = (e) => {
       resolve(e.data);
       worker.terminate();
     };
 
-    worker.onerror = (err) => {
-      reject(err);
+    worker.onerror = () => {
+      // Worker error - fall back to synchronous computation
       worker.terminate();
+      resolve(fallback());
     };
 
     worker.postMessage({ oldString, newString, disableWordDiff, lineCompareMethod, linesOffset, showLines, deferWordDiff });