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diff --git a/third_party/WebIDL/WebIDL.py b/third_party/WebIDL/WebIDL.py
index 2366e3f702..e1d973f5fe 100644
--- a/third_party/WebIDL/WebIDL.py
+++ b/third_party/WebIDL/WebIDL.py
@@ -9022,6 +9022,67 @@ class Parser(Tokenizer):
itr_iface.asyncIterableInterface = iface
self._productions.append(itr_iface)
iterable.iteratorType = IDLWrapperType(iface.location, itr_iface)
+ if not iterable:
+ # We haven't run finish() on the interface yet, so we don't know
+ # whether our interface is maplike/setlike/iterable or not. This
+ # means we have to loop through the members to see if we have an
+ # iterable member.
+ for m in iface.members:
+ if isinstance(m, IDLMaplikeOrSetlike):
+ iterable = m
+ break
+ if iterable and (iterable.isSetlike() or iterable.isMaplike()):
+
+ def simpleExtendedAttr(str):
+ return IDLExtendedAttribute(iface.location, (str,))
+
+ if isinstance(iterable, IDLAsyncIterable):
+ nextReturnType = IDLPromiseType(
+ iterable.location, BuiltinTypes[IDLBuiltinType.Types.any]
+ )
+ else:
+ nextReturnType = BuiltinTypes[IDLBuiltinType.Types.object]
+ nextMethod = IDLMethod(
+ iterable.location,
+ IDLUnresolvedIdentifier(iterable.location, "next"),
+ nextReturnType,
+ [],
+ )
+ nextMethod.addExtendedAttributes([simpleExtendedAttr("Throws")])
+
+ methods = [nextMethod]
+
+ if iterable.isSetlike():
+ itr_suffix = "Setlike"
+ else:
+ itr_suffix = "Maplike"
+ itr_ident = IDLUnresolvedIdentifier(
+ iface.location, iface.identifier.name + itr_suffix
+ )
+ classNameOverride = iface.identifier.name + " " + itr_suffix
+ itr_iface = IDLInterface(
+ iface.location,
+ self.globalScope(),
+ itr_ident,
+ None,
+ methods,
+ isKnownNonPartial=True,
+ classNameOverride=classNameOverride,
+ )
+ itr_iface.addExtendedAttributes(
+ [simpleExtendedAttr("LegacyNoInterfaceObject")]
+ )
+ # Make sure the exposure set for the iterator interface is the
+ # same as the exposure set for the iterable interface, because
+ # we're going to generate methods on the iterable that return
+ # instances of the iterator.
+ itr_iface._exposureGlobalNames = set(iface._exposureGlobalNames)
+ # Always append generated iterable interfaces after the
+ # interface they're a member of, otherwise nativeType generation
+ # won't work correctly.
+ itr_iface.iterableInterface = iface
+ self._productions.append(itr_iface)
+ iterable.iteratorType = IDLWrapperType(iface.location, itr_iface)
# Make sure we finish IDLIncludesStatements before we finish the
# IDLInterfaces.
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