The method getType() does not exist on Digia\GraphQL\Language\AST\Node\NodeInterface. It seems like you code against a sub-type of Digia\GraphQL\Language\AST\Node\NodeInterface such as Digia\GraphQL\Language\A...ationTypeDefinitionNode or Digia\GraphQL\Language\A...nputValueDefinitionNode or Digia\GraphQL\Language\A...ode\FieldDefinitionNode or Digia\GraphQL\Language\A...\VariableDefinitionNode or Digia\GraphQL\Language\AST\Node\ListTypeNode or Digia\GraphQL\Language\AST\Node\NonNullTypeNode.
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Ignorable by Annotation
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If this is a false-positive, you can also ignore this issue in your code via the ignore-call annotation