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Unreal Engine C++ API Reference > Editor > BlueprintGraph > FBlueprintActionFilter
Syntax
TArray< TSubclassOf< UEdGraphNode > > PermittedNodeTypes
Remarks
A list of allowed node types. If a spawner's NodeClass isn't one of these types, then it is filtered out. Use the "RejectPermittedNodeSubClasses" flag to aggressively filter out child classes as well (enforcing an explicit match).