fix: getFileName can return null (#861)

Refs: denoland/deno#24869

core/error.rs

@@ -1099,8 +1099,10 @@ pub mod callsite_fns {
     };
     // call getFileName
     let orig_ret =
-      call_method::<v8::String>(scope, orig, super::GET_FILE_NAME, &[]);
-    if let Some(ret_val) = orig_ret {
+      call_method::<v8::Value>(scope, orig, super::GET_FILE_NAME, &[]);
+    if let Some(ret_val) =
+      orig_ret.and_then(|v| v.try_cast::<v8::String>().ok())
+    {
       // strip off `file://`
       let string = ret_val.to_rust_string_lossy(scope);
       if let Some(file_name) = maybe_to_path_str(&string) {

testing/integration/error_get_file_name/error_get_file_name.ts

@@ -0,0 +1,12 @@
+// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
+
+// deno-lint-ignore no-explicit-any
+(Error as any).prepareStackTrace = (_err: unknown, frames: any[]) => {
+  return frames.map((frame) => frame.getFileName());
+};
+
+new Promise((_, reject) => {
+  reject(new Error("fail").stack);
+}).catch((err) => {
+  console.log(err);
+});

testing/lib.rs

@@ -66,6 +66,7 @@ integration_test!(
   error_prepare_stack_trace,
   error_with_stack,
   error_without_stack,
+  error_get_file_name,
   main_module_handler,
   module_types,
   pending_unref_op_tla,