Function createNodeLabelCondition

packages/graph/src/astToSteps.ts:2021–2031

* Create a label condition from either simple labels or a label expression. * Returns null if no label filtering is needed.

(
  node: NodePattern | { labels: string[]; labelExpression?: LabelExpression },
)

 * Returns null if no label filtering is needed.
 */
function createNodeLabelCondition(
  node: NodePattern | { labels: string[]; labelExpression?: LabelExpression },
): StepCondition | null {
  if (node.labelExpression) {
    return convertLabelExpression(node.labelExpression);
  }
  if (node.labels.length > 0) {
    return createLabelCondition(node.labels);
  }
  return null;
}

/**
 * Convert an AST condition value to Step condition value format.