diff --git a/Libraries/LibWeb/Streams/AbstractOperations.cpp b/Libraries/LibWeb/Streams/AbstractOperations.cpp
index 539dd745324..103ae128b10 100644
--- a/Libraries/LibWeb/Streams/AbstractOperations.cpp
+++ b/Libraries/LibWeb/Streams/AbstractOperations.cpp
@@ -5302,21 +5302,6 @@ WebIDL::ExceptionOr<JS::Value> structured_clone(JS::Realm& realm, JS::Value valu
     return TRY(HTML::structured_deserialize(vm, serialized, realm));
 }
 
-// Non-standard function to aid in converting a user-provided function into a WebIDL::Callback. This is essentially
-// what the Bindings generator would do at compile time, but at runtime instead.
-JS::ThrowCompletionOr<GC::Root<WebIDL::CallbackType>> property_to_callback(JS::VM& vm, JS::Value value, JS::PropertyKey const& property_key, WebIDL::OperationReturnsPromise operation_returns_promise)
-{
-    auto property = TRY(value.get(vm, property_key));
-
-    if (property.is_undefined())
-        return GC::Root<WebIDL::CallbackType> {};
-
-    if (!property.is_function())
-        return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAFunction, property.to_string_without_side_effects());
-
-    return vm.heap().allocate<WebIDL::CallbackType>(property.as_object(), HTML::incumbent_realm(), operation_returns_promise);
-}
-
 // https://streams.spec.whatwg.org/#set-up-readable-byte-stream-controller-from-underlying-source
 WebIDL::ExceptionOr<void> set_up_readable_byte_stream_controller_from_underlying_source(ReadableStream& stream, JS::Value underlying_source, UnderlyingSource const& underlying_source_dict, double high_water_mark)
 {
diff --git a/Libraries/LibWeb/Streams/AbstractOperations.h b/Libraries/LibWeb/Streams/AbstractOperations.h
index ef8a16808ef..ec181944ffd 100644
--- a/Libraries/LibWeb/Streams/AbstractOperations.h
+++ b/Libraries/LibWeb/Streams/AbstractOperations.h
@@ -179,8 +179,6 @@ bool can_transfer_array_buffer(JS::ArrayBuffer const& array_buffer);
 WebIDL::ExceptionOr<JS::Value> clone_as_uint8_array(JS::Realm&, WebIDL::ArrayBufferView&);
 WebIDL::ExceptionOr<JS::Value> structured_clone(JS::Realm&, JS::Value value);
 
-JS::ThrowCompletionOr<GC::Root<WebIDL::CallbackType>> property_to_callback(JS::VM& vm, JS::Value value, JS::PropertyKey const& property_key, WebIDL::OperationReturnsPromise);
-
 // https://streams.spec.whatwg.org/#value-with-size
 struct ValueWithSize {
     JS::Value value;
diff --git a/Libraries/LibWeb/Streams/Transformer.cpp b/Libraries/LibWeb/Streams/Transformer.cpp
index 1d07ad4cbe6..3eaedc2e755 100644
--- a/Libraries/LibWeb/Streams/Transformer.cpp
+++ b/Libraries/LibWeb/Streams/Transformer.cpp
@@ -19,10 +19,10 @@ JS::ThrowCompletionOr<Transformer> Transformer::from_value(JS::VM& vm, JS::Value
     auto& object = value.as_object();
 
     Transformer transformer {
-        .start = TRY(property_to_callback(vm, value, "start", WebIDL::OperationReturnsPromise::No)),
-        .transform = TRY(property_to_callback(vm, value, "transform", WebIDL::OperationReturnsPromise::Yes)),
-        .flush = TRY(property_to_callback(vm, value, "flush", WebIDL::OperationReturnsPromise::Yes)),
-        .cancel = TRY(property_to_callback(vm, value, "cancel", WebIDL::OperationReturnsPromise::Yes)),
+        .start = TRY(WebIDL::property_to_callback(vm, value, "start", WebIDL::OperationReturnsPromise::No)),
+        .transform = TRY(WebIDL::property_to_callback(vm, value, "transform", WebIDL::OperationReturnsPromise::Yes)),
+        .flush = TRY(WebIDL::property_to_callback(vm, value, "flush", WebIDL::OperationReturnsPromise::Yes)),
+        .cancel = TRY(WebIDL::property_to_callback(vm, value, "cancel", WebIDL::OperationReturnsPromise::Yes)),
         .readable_type = {},
         .writable_type = {},
     };
diff --git a/Libraries/LibWeb/Streams/UnderlyingSink.cpp b/Libraries/LibWeb/Streams/UnderlyingSink.cpp
index 553b7a98619..cf036668f72 100644
--- a/Libraries/LibWeb/Streams/UnderlyingSink.cpp
+++ b/Libraries/LibWeb/Streams/UnderlyingSink.cpp
@@ -19,10 +19,10 @@ JS::ThrowCompletionOr<UnderlyingSink> UnderlyingSink::from_value(JS::VM& vm, JS:
     auto& object = value.as_object();
 
     UnderlyingSink underlying_sink {
-        .start = TRY(property_to_callback(vm, value, "start", WebIDL::OperationReturnsPromise::No)),
-        .write = TRY(property_to_callback(vm, value, "write", WebIDL::OperationReturnsPromise::Yes)),
-        .close = TRY(property_to_callback(vm, value, "close", WebIDL::OperationReturnsPromise::Yes)),
-        .abort = TRY(property_to_callback(vm, value, "abort", WebIDL::OperationReturnsPromise::Yes)),
+        .start = TRY(WebIDL::property_to_callback(vm, value, "start", WebIDL::OperationReturnsPromise::No)),
+        .write = TRY(WebIDL::property_to_callback(vm, value, "write", WebIDL::OperationReturnsPromise::Yes)),
+        .close = TRY(WebIDL::property_to_callback(vm, value, "close", WebIDL::OperationReturnsPromise::Yes)),
+        .abort = TRY(WebIDL::property_to_callback(vm, value, "abort", WebIDL::OperationReturnsPromise::Yes)),
         .type = {},
     };
 
diff --git a/Libraries/LibWeb/Streams/UnderlyingSource.cpp b/Libraries/LibWeb/Streams/UnderlyingSource.cpp
index b2d92f6cb90..3c1cf531116 100644
--- a/Libraries/LibWeb/Streams/UnderlyingSource.cpp
+++ b/Libraries/LibWeb/Streams/UnderlyingSource.cpp
@@ -22,9 +22,9 @@ JS::ThrowCompletionOr<UnderlyingSource> UnderlyingSource::from_value(JS::VM& vm,
     auto& object = value.as_object();
 
     UnderlyingSource underlying_source {
-        .start = TRY(property_to_callback(vm, value, "start", WebIDL::OperationReturnsPromise::No)),
-        .pull = TRY(property_to_callback(vm, value, "pull", WebIDL::OperationReturnsPromise::Yes)),
-        .cancel = TRY(property_to_callback(vm, value, "cancel", WebIDL::OperationReturnsPromise::Yes)),
+        .start = TRY(WebIDL::property_to_callback(vm, value, "start", WebIDL::OperationReturnsPromise::No)),
+        .pull = TRY(WebIDL::property_to_callback(vm, value, "pull", WebIDL::OperationReturnsPromise::Yes)),
+        .cancel = TRY(WebIDL::property_to_callback(vm, value, "cancel", WebIDL::OperationReturnsPromise::Yes)),
         .type = {},
         .auto_allocate_chunk_size = {},
     };
diff --git a/Libraries/LibWeb/WebIDL/CallbackType.cpp b/Libraries/LibWeb/WebIDL/CallbackType.cpp
index 24dd1fc3cdc..8a363520eed 100644
--- a/Libraries/LibWeb/WebIDL/CallbackType.cpp
+++ b/Libraries/LibWeb/WebIDL/CallbackType.cpp
@@ -5,6 +5,7 @@
  */
 
 #include <LibJS/Runtime/Object.h>
+#include <LibJS/Runtime/VM.h>
 #include <LibWeb/HTML/Scripting/Environments.h>
 #include <LibWeb/WebIDL/CallbackType.h>
 
@@ -26,4 +27,19 @@ void CallbackType::visit_edges(Cell::Visitor& visitor)
     visitor.visit(callback_context);
 }
 
+// Non-standard function to aid in converting a user-provided function into a WebIDL::Callback. This is essentially
+// what the Bindings generator would do at compile time, but at runtime instead.
+JS::ThrowCompletionOr<GC::Root<CallbackType>> property_to_callback(JS::VM& vm, JS::Value value, JS::PropertyKey const& property_key, OperationReturnsPromise operation_returns_promise)
+{
+    auto property = TRY(value.get(vm, property_key));
+
+    if (property.is_undefined())
+        return GC::Root<CallbackType> {};
+
+    if (!property.is_function())
+        return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAFunction, property.to_string_without_side_effects());
+
+    return vm.heap().allocate<CallbackType>(property.as_object(), HTML::incumbent_realm(), operation_returns_promise);
+}
+
 }
diff --git a/Libraries/LibWeb/WebIDL/CallbackType.h b/Libraries/LibWeb/WebIDL/CallbackType.h
index f8ca51b5269..125e13110e7 100644
--- a/Libraries/LibWeb/WebIDL/CallbackType.h
+++ b/Libraries/LibWeb/WebIDL/CallbackType.h
@@ -39,4 +39,6 @@ private:
     virtual void visit_edges(Cell::Visitor&) override;
 };
 
+JS::ThrowCompletionOr<GC::Root<WebIDL::CallbackType>> property_to_callback(JS::VM& vm, JS::Value value, JS::PropertyKey const& property_key, WebIDL::OperationReturnsPromise);
+
 }