avoid-duplicate-exports
Warns when a file has multiple exports declarations with the same URI.
Example
❌ Bad:
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
export 'package:my_app/good_folder/something.dart';
// LINT: Avoid declaring duplicate exports.
export 'package:my_app/good_folder/something.dart';
✅ Good:
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
// Correct, no duplicate exports
export 'package:my_app/good_folder/something.dart';