fix: skip fileURLToPath when id is not file: protocol

lib/index.mjs

@@ -98,7 +98,14 @@ export function resolveImports (code, opts) {
 // Utils
 
 export function fileURLToPath (id) {
-  return _fileURLToPath(id).replace(/\\/g, '/')
+  if (typeof id === 'string' && !id.startsWith('file://')) {
+    return normalizeSlash(id)
+  }
+  return normalizeSlash(_fileURLToPath(id))
+}
+
+function normalizeSlash (str) {
+  return str.replace(/\\/g, '/')
 }
 
 function _pcall (fn, ...args) {