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name : TypeComparators.php
 <?php declare(strict_types=1);

namespace GraphQL\Utils;

use GraphQL\Error\InvariantViolation;
use GraphQL\Type\Definition\ImplementingType;
use GraphQL\Type\Definition\ListOfType;
use GraphQL\Type\Definition\NonNull;
use GraphQL\Type\Definition\Type;
use GraphQL\Type\Schema;

class TypeComparators
{
    /** Provided two types, return true if the types are equal (invariant). */
    public static function isEqualType(Type $typeA, Type $typeB): bool
    {
        // Equivalent types are equal.
        if ($typeA === $typeB) {
            return true;
        }

        // If either type is non-null, the other must also be non-null.
        if ($typeA instanceof NonNull && $typeB instanceof NonNull) {
            return self::isEqualType($typeA->getWrappedType(), $typeB->getWrappedType());
        }

        // If either type is a list, the other must also be a list.
        if ($typeA instanceof ListOfType && $typeB instanceof ListOfType) {
            return self::isEqualType($typeA->getWrappedType(), $typeB->getWrappedType());
        }

        // Otherwise the types are not equal.
        return false;
    }

    /**
     * Provided a type and a super type, return true if the first type is either
     * equal or a subset of the second super type (covariant).
     *
     * @throws InvariantViolation
     */
    public static function isTypeSubTypeOf(Schema $schema, Type $maybeSubType, Type $superType): bool
    {
        // Equivalent type is a valid subtype
        if ($maybeSubType === $superType) {
            return true;
        }

        // If superType is non-null, maybeSubType must also be nullable.
        if ($superType instanceof NonNull) {
            if ($maybeSubType instanceof NonNull) {
                return self::isTypeSubTypeOf($schema, $maybeSubType->getWrappedType(), $superType->getWrappedType());
            }

            return false;
        }

        if ($maybeSubType instanceof NonNull) {
            // If superType is nullable, maybeSubType may be non-null.
            return self::isTypeSubTypeOf($schema, $maybeSubType->getWrappedType(), $superType);
        }

        // If superType type is a list, maybeSubType type must also be a list.
        if ($superType instanceof ListOfType) {
            if ($maybeSubType instanceof ListOfType) {
                return self::isTypeSubTypeOf($schema, $maybeSubType->getWrappedType(), $superType->getWrappedType());
            }

            return false;
        }

        if ($maybeSubType instanceof ListOfType) {
            // If superType is not a list, maybeSubType must also be not a list.
            return false;
        }

        if (Type::isAbstractType($superType)) {
            // If superType type is an abstract type, maybeSubType type may be a currently
            // possible object or interface type.

            return $maybeSubType instanceof ImplementingType
                && $schema->isSubType($superType, $maybeSubType);
        }

        return false;
    }
}
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