QueryBuilder constructor Null safety

QueryBuilder(
  1. String operationName,
  2. Map<String, dynamic>? parameters,
  3. Map<String, dynamic> results
)

Builds a query string to return results ie. {"query": {products {id name}}

Implementation

QueryBuilder(String operationName, Map<String, dynamic>? parameters,
    Map<String, dynamic> results)
    : super(operationName, parameters, results);