stream: handle undefined chunks correctly in decode stream

Align TextDecoderStream behavior with WPT requirements by treating undefined chunks as errors. This change ensures that TextDecoderStream properly handles unexpected chunk types and throws an error when receiving undefined input. This update addresses the failing WPT for decode stream error handling. PR-URL: #55153 Reviewed-By: Mattias Buelens <[email protected]> Reviewed-By: Matthew Aitken <[email protected]>
nodejs · Sep 30, 2024 · 3111ed7 · 3111ed7
1 parent bbf08c6
commit 3111ed7
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diff --git a/lib/internal/webstreams/encoding.js b/lib/internal/webstreams/encoding.js
@@ -20,6 +20,7 @@ const { customInspect } = require('internal/webstreams/util');
 
 const {
   codes: {
+    ERR_INVALID_ARG_TYPE,
     ERR_INVALID_THIS,
   },
 } = require('internal/errors');
@@ -133,6 +134,9 @@ class TextDecoderStream {
     this.#handle = new TextDecoder(encoding, options);
     this.#transform = new TransformStream({
       transform: (chunk, controller) => {
+        if (chunk === undefined) {
+          throw new ERR_INVALID_ARG_TYPE('chunk', 'string', chunk);
+        }
         const value = this.#handle.decode(chunk, { stream: true });
         if (value)
           controller.enqueue(value);

diff --git a/test/wpt/status/encoding.json b/test/wpt/status/encoding.json
@@ -66,13 +66,6 @@
   "streams/decode-utf8.any.js": {
     "requires": ["small-icu"]
   },
-  "streams/decode-bad-chunks.any.js": {
-    "fail": {
-      "expected": [
-        "chunk of type undefined should error the stream"
-      ]
-    }
-  },
   "streams/decode-non-utf8.any.js": {
     "requires": ["full-icu"]
   },