debut refacto

lib/sanitize.ts

@@ -0,0 +1,12 @@
+import { basename } from 'path'
+
+/**
+ * Sanitize a filename: strip path components, replace special chars,
+ * collapse underscores, lowercase.
+ */
+export function sanitizeFilename(name: string): string {
+  return basename(name)
+    .replace(/[^a-zA-Z0-9._-]/g, '_')
+    .replace(/_{2,}/g, '_')
+    .toLowerCase()
+}