Rename server->core (#638)

packages/core/src/utils/errors.ts

@@ -0,0 +1,22 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+export function isNodeError(error: unknown): error is NodeJS.ErrnoException {
+  return error instanceof Error && 'code' in error;
+}
+
+export function getErrorMessage(error: unknown): string {
+  if (error instanceof Error) {
+    return error.message;
+  } else {
+    try {
+      const errorMessage = String(error);
+      return errorMessage;
+    } catch {
+      return 'Failed to get error details';
+    }
+  }
+}