Error handling for transient sourcemap build failures

src/index.ts

@@ -108,13 +108,17 @@ async function rebuild() {
 }
 
 for (const root of SOURCE_ROOTS) {
-  fs.watch(root, { recursive: true }, (_, file) => {
+  fs.watch(root, { recursive: true }, async (_, file) => {
     if (file?.startsWith('.git/')) return
     console.log(
       `Detected change in ${root} -> ${file}; rebuilding sourcemap...`,
     )
     sourcemapCache.delete(root)
-    rebuild()
+    try {
+      await rebuild()
+    } catch {
+      console.error('Failed to rebuild sourcemap.')
+    }
   })
 }