From 9610f1c05270ab88ea9209c16bea5ba1873a9aaa Mon Sep 17 00:00:00 2001
From: Richard Viney <richard.viney@gmail.com>
Date: Sun, 19 May 2024 21:39:43 +1200
Subject: Fix `bit_array` slices of slices on JavaScript

---
 src/gleam_stdlib.mjs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'src/gleam_stdlib.mjs')

diff --git a/src/gleam_stdlib.mjs b/src/gleam_stdlib.mjs
index d921c63..256850a 100644
--- a/src/gleam_stdlib.mjs
+++ b/src/gleam_stdlib.mjs
@@ -362,7 +362,8 @@ export function bit_array_slice(bits, position, length) {
   const start = Math.min(position, position + length);
   const end = Math.max(position, position + length);
   if (start < 0 || end > bits.length) return new Error(Nil);
-  const buffer = new Uint8Array(bits.buffer.buffer, start, Math.abs(length));
+  const byteOffset = bits.buffer.byteOffset + start;
+  const buffer = new Uint8Array(bits.buffer.buffer, byteOffset, Math.abs(length));
   return new Ok(new BitArray(buffer));
 }
 
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