The expression return array($this, $resolveMethod) returns the type array<integer,Digia\Grap...bstractResolver|string> which is incompatible with the type-hinted return null|callable.
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}
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return null;
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}
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/**
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* @inheritdoc
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*/
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public function getTypeResolver(): ?callable
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{
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return function ($rootValue, $contextValues, ResolveInfo $info) {