On line 15, how to break out of scope and reference dart String type?

file.dart

enum DataType
{
  None(false, BASE_OPERATOR_TITLE_MAP), // Null or nil is this language.
  Boolean(false, BASE_OPERATOR_TITLE_MAP),
  Number(false, BASE_OPERATOR_TITLE_MAP),
  String(false, BASE_OPERATOR_TITLE_MAP),
  Date(false, BASE_OPERATOR_TITLE_MAP),
  StringArray(true, BASE_OPERATOR_TITLE_MAP), // An array of strings
  Object(false, BASE_OPERATOR_TITLE_MAP), // A catch-all type for objects types.
  DateTime(false, BASE_OPERATOR_TITLE_MAP),
  Anniversary(false, BASE_OPERATOR_TITLE_MAP);

  final bool isArray;
  
  final Map<OperatorType, String> operatorTitleMap;

  const DataType(bool this.isArray, Map<OperatorType, String> this.operatorTitleMap);
}

Why are you creating names that deliberately shadow names that already have significance?

The real crime here is not naming enum members in lowerCamelCase :D

That said, you can do this:

import 'dart:core' as core;

enum DataType
{
  /* ... */;

  final Map<OperatorType, core.String> operatorTitleMap;

  const DataType(bool this.isArray, Map<OperatorType, String> this.operatorTitleMap);
}