Automattic\WooCommerce\Vendor\GraphQL\Utils

AST::isMissingVariable │ private static │ WC 1.0

Returns true if the provided valueNode is a variable which is not defined in the set of variables.

Method of the class: AST{}

No Hooks.

Returns

null. Nothing (null).

Usage

$result = AST::isMissingVariable( $valueNode, ?array $variables ): bool;
$valueNode(ValueNode&Node) (required)
.
?array $variables(required)
.

AST::isMissingVariable() code WC 10.9.1

woocommerce/lib/packages/GraphQL/Utils/AST.php 
private static function isMissingVariable(ValueNode $valueNode, ?array $variables): bool
{
    return $valueNode instanceof VariableNode
        && ($variables === null || ! array_key_exists($valueNode->name->value, $variables));
}