From 5c1d581bc42a5c5548e347ff5bee76d1a9a2b164 Mon Sep 17 00:00:00 2001
From: Connor Peet <connor@peet.io>
Date: Tue, 26 Sep 2023 12:03:50 -0700
Subject: [PATCH] fix: authentication sourcemap fallback failing for some maps
 (#1816)

Fixes #1814
---
 src/adapter/resourceProvider/statefulResourceProvider.ts | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/adapter/resourceProvider/statefulResourceProvider.ts b/src/adapter/resourceProvider/statefulResourceProvider.ts
index e1eb85eea..7ef726310 100644
--- a/src/adapter/resourceProvider/statefulResourceProvider.ts
+++ b/src/adapter/resourceProvider/statefulResourceProvider.ts
@@ -99,9 +99,12 @@ export class StatefulResourceProvider extends BasicResourceProvider implements I
         return original;
       }
 
-      const chunk = chunkRes.base64Encoded ? Buffer.from(chunkRes.data, 'base64') : chunkRes.data;
-      offset += chunk.length;
-      result.push(chunk.toString());
+      const chunk = chunkRes.base64Encoded
+        ? Buffer.from(chunkRes.data, 'base64').toString()
+        : chunkRes.data;
+      // V8 uses byte length, not UTF-16 length, see #1814
+      offset += Buffer.byteLength(chunk, 'utf-8');
+      result.push(chunk);
       if (offset >= maxOffset) {
         this.cdp.IO.close({ handle: res.resource.stream }); // no await: do this in the background
         break;