Automattic\WooCommerce\Vendor\GraphQL\Utils

TypeComparators::isTypeSubTypeOf │ public static │ WC 1.0

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).

Method of the class: TypeComparators{}

No Hooks.

Returns

null. Nothing (null).

Usage

$result = TypeComparators::isTypeSubTypeOf( $schema, $maybeSubType, $superType ): bool;
$schema(Schema) (required)
.
$maybeSubType(Type) (required)
.
$superType(Type) (required)
.

TypeComparators::isTypeSubTypeOf() code WC 10.9.1

woocommerce/lib/packages/GraphQL/Utils/TypeComparators.php 
public static function isTypeSubTypeOf(Schema $schema, Type $maybeSubType, Type $superType): bool
{
    // Equivalent type is a valid subtype
    if ($maybeSubType === $superType) {
        return true;
    }

    if (self::areSameBuiltInScalar($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;
}