From 2082b0e4f3493860e76e2e873d8db8f51847581d Mon Sep 17 00:00:00 2001
From: Geoffrey Booth <webadmin@geoffreybooth.com>
Date: Mon, 24 Jun 2024 21:27:17 -0700
Subject: [PATCH] This is a buffer here

---
 lib/internal/modules/esm/get_format.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/internal/modules/esm/get_format.js b/lib/internal/modules/esm/get_format.js
index 2bb6771503094d..bb0039c162c0b7 100644
--- a/lib/internal/modules/esm/get_format.js
+++ b/lib/internal/modules/esm/get_format.js
@@ -127,7 +127,7 @@ function getFileProtocolModuleFormat(url, context = { __proto__: null }, ignoreE
         // `source` is undefined when this is called from `defaultResolve`;
         // but this gets called again from `defaultLoad`/`defaultLoadSync`.
         if (getOptionValue('--experimental-detect-module')) {
-          const format = detectModuleFormat(source, url);
+          const format = detectModuleFormat(source?.toString(), url);
           if (format === 'module') {
             // This module has a .js extension, a package.json with no `type` field, and ESM syntax.
             // Warn about the missing `type` field so that the user can avoid the performance penalty of detection.