src/Executor/ReferenceExecutor.php
private function doesFragmentConditionMatch(
        $fragment,
        ObjectType $type
    ) {
        $typeConditionNode = $fragment->typeCondition;
        if ($typeConditionNode === null) {
            return true;
        }
        $conditionalType = TypeInfo::typeFromAST($this->exeContext->schema, $typeConditionNode);
        if ($conditionalType === $type) {
            return true;
        }
        if ($conditionalType instanceof AbstractType) {
            return $this->exeContext->schema->isPossibleType($conditionalType, $type);
        }

        return false;
    }
private function doesFragmentConditionMatch(
        $fragment,
        ObjectType $type
    ) {
        $typeConditionNode = $fragment->typeCondition;
        if ($typeConditionNode === null) {
            return true;
        }
        $conditionalType = TypeInfo::typeFromAST($this->exeContext->schema, $typeConditionNode);
        if ($conditionalType === $type) {
            return true;
        }
        if ($conditionalType instanceof AbstractType) {
            return $this->exeContext->schema->isPossibleType($conditionalType, $type);
        }

        return false;
    }
Determines if a fragment is applicable to the given type.

@param FragmentDefinitionNode|InlineFragmentNode $fragment

@return bool