tor-browser

commit eecf1428dd0019a1c4694d203166f5d97dc91baa
parent dce7e1b78eb5c206240f063576c867ba1fd7147b
Author: Meg Ford <meg387@gmail.com>
Date:   Wed, 12 Nov 2025 15:32:54 +0000

Bug 1998512 - Add placeholder `chunks` and `windows` methods to Iterator.prototype. r=dminor

Differential Revision: https://phabricator.services.mozilla.com/D271917

Diffstat:
M
js/src/builtin/Iterator.js
 | 
18
++++++++++++++++++
M
js/src/vm/CommonPropertyNames.h
 | 
2
++
M
js/src/vm/Iteration.cpp
 | 
4
++++
M
js/src/vm/JSObject.cpp
 | 
6
++++++

4 files changed, 30 insertions(+), 0 deletions(-)
diff --git a/js/src/builtin/Iterator.js b/js/src/builtin/Iterator.js
@@ -1922,4 +1922,22 @@ function IteratorRange(start, end, optionOrStep) {
   ThrowTypeError(JSMSG_ITERATOR_RANGE_INVALID_START);
 
 }
+
+/**
+ *  Iterator.prototype.chunks ( chunkSize )
+ *
+ *  https://tc39.es/proposal-iterator-chunking/#sec-iterator.prototype.chunks
+ */
+function IteratorChunks(chunkSize) {
+  return false;
+}
+
+/**
+ *  Iterator.prototype.windows ( windowSize, undersized )
+ *
+ *  https://tc39.es/proposal-iterator-chunking/#sec-iterator.prototype.windows
+ */
+function IteratorWindows(windowSize, undersized) {
+  return false;
+}
 #endif
diff --git a/js/src/vm/CommonPropertyNames.h b/js/src/vm/CommonPropertyNames.h
@@ -75,6 +75,7 @@
   MACRO_(caseFirst, "caseFirst")                                               \
   MACRO_(catch_, "catch")                                                      \
   MACRO_(cause, "cause")                                                       \
+  MACRO_(chunks, "chunks")                                                     \
   MACRO_(class_, "class")                                                      \
   MACRO_(cleanupSome, "cleanupSome")                                           \
   MACRO_(collation, "collation")                                               \
@@ -555,6 +556,7 @@
   MACRO_(weeksDisplay, "weeksDisplay")                                         \
   MACRO_(weeksStyle, "weeksStyle")                                             \
   MACRO_(while_, "while")                                                      \
+  MACRO_(windows, "windows")                                                   \
   MACRO_(with, "with")                                                         \
   MACRO_(written, "written")                                                   \
   MACRO_(toReversed, "toReversed")                                             \
diff --git a/js/src/vm/Iteration.cpp b/js/src/vm/Iteration.cpp
@@ -1939,6 +1939,10 @@ static const JSFunctionSpec iterator_methods[] = {
 #ifdef ENABLE_EXPLICIT_RESOURCE_MANAGEMENT
     JS_SELF_HOSTED_SYM_FN(dispose, "IteratorDispose", 0, 0),
 #endif
+#ifdef NIGHTLY_BUILD
+    JS_SELF_HOSTED_FN("chunks", "IteratorChunks", 1, 0),
+    JS_SELF_HOSTED_FN("windows", "IteratorWindows", 2, 0),
+#endif
     JS_FS_END,
 };
 
diff --git a/js/src/vm/JSObject.cpp b/js/src/vm/JSObject.cpp
@@ -2245,6 +2245,12 @@ JS_PUBLIC_API bool js::ShouldIgnorePropertyDefinition(JSContext* cx,
       return true;
     }
   }
+  if (key == JSProto_Iterator && !JS::Prefs::experimental_iterator_chunking()) {
+    if (id == NameToId(cx->names().chunks) ||
+        id == NameToId(cx->names().windows)) {
+      return true;
+    }
+  }
 #endif
 
   if (key == JSProto_Function &&