Automattic\WooCommerce\Vendor\GraphQL\Validator\Rules

VariablesInAllowedPosition::allowedVariableUsage │ protected │ WC 1.0

Returns true if the variable is allowed in the location it was found, which includes considering if default values exist for either the variable or the location at which it is located.

Method of the class: VariablesInAllowedPosition{}

No Hooks.

Returns

null. Nothing (null).

Usage

// protected - for code of main (parent) or child class
$result = $this->allowedVariableUsage( $schema, $varType, $varDefaultValue, $locationType, $locationDefaultValue ): bool;
$schema(Schema) (required)
.
$varType(Type) (required)
.
$varDefaultValue(ValueNode|null) (required)
.
$locationType(Type) (required)
.
$locationDefaultValue(mixed) (required)
.

VariablesInAllowedPosition::allowedVariableUsage() code WC 10.9.1

woocommerce/lib/packages/GraphQL/Validator/Rules/VariablesInAllowedPosition.php 
protected function allowedVariableUsage(Schema $schema, Type $varType, $varDefaultValue, Type $locationType, $locationDefaultValue): bool
{
    if ($locationType instanceof NonNull && ! $varType instanceof NonNull) {
        $hasNonNullVariableDefaultValue = $varDefaultValue !== null && ! $varDefaultValue instanceof NullValueNode;
        $hasLocationDefaultValue = Utils::undefined() !== $locationDefaultValue;
        if (! $hasNonNullVariableDefaultValue && ! $hasLocationDefaultValue) {
            return false;
        }

        $nullableLocationType = $locationType->getWrappedType();

        return TypeComparators::isTypeSubTypeOf($schema, $varType, $nullableLocationType);
    }

    return TypeComparators::isTypeSubTypeOf($schema, $varType, $locationType);
}