handle `latin1` in `Bun__encoding__toString`. (#3739)

Close: #3738

2 files changed, 11 insertions, 0 deletions

diff --git a/src/bun.js/webcore/encoding.zig b/src/bun.js/webcore/encoding.zig
index 41a27ccd4..7a0188aab 100644
--- a/src/bun.js/webcore/encoding.zig
+++ b/src/bun.js/webcore/encoding.zig
@@ -828,6 +828,7 @@ pub const Encoder = struct {
             .hex => toString(input, len, globalObject, .hex),
             .base64 => toString(input, len, globalObject, .base64),
             .base64url => toString(input, len, globalObject, .base64url),
+            .latin1 => toString(input, len, globalObject, .latin1),
 
             // treat everything else as utf8
             else => toString(input, len, globalObject, .utf8),
diff --git a/test/js/node/string_decoder/string-decoder.test.js b/test/js/node/string_decoder/string-decoder.test.js
index aba73401a..5e8463955 100644
--- a/test/js/node/string_decoder/string-decoder.test.js
+++ b/test/js/node/string_decoder/string-decoder.test.js
@@ -250,3 +250,13 @@ it("invalid utf-8 input, pr #3562", () => {
   output += decoder.end();
   expect(output).toStrictEqual("\uFFFD\uFFFD");
 });
+
+it("decoding latin1, issue #3738", () => {
+  const decoder = new RealStringDecoder("latin1");
+  let output = "";
+  output += decoder.write(Buffer.from("DD", "hex"));
+  output += decoder.write(Buffer.from("59", "hex"));
+  output += decoder.write(Buffer.from("DE", "hex"));
+  output += decoder.end();
+  expect(output).toStrictEqual("ÝYÞ");
+});