fix: use || instead of ?? for node 12 compat

SuperchupuDev · thecodrr · commit 2ac620dd8d4c · 2025-07-07T09:00:25.000+05:00
diff --git a/src/api/walker.ts b/src/api/walker.ts
@@ -51,7 +51,7 @@ export class Walker<TOutput extends Output> {
       symlinks: new Map(),
       visited: [""].slice(0, 0),
       controller: new Aborter(),
-      fs: options.fs ?? nativeFs,
+      fs: options.fs || nativeFs,
     };
 
     /*
