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Summary

df_safer_dart_lints provides custom lint rules for df_safer_dart that help enforce safety patterns at compile-time. These rules work with the custom_lint package.

Available Lint Rules

Rule	Severity	Purpose
must_use_outcome_or_error	Error	Ensures Option/Result/Resolvable return values are handled
no_future_outcome_type_or_error	Error	Prevents Future<Result> types (use Async instead)
must_await_all_futures	Warning	Ensures Futures are awaited in annotated scopes
must_await_all_futures_or_error	Error	Same as above, but as error
must_be_anonymous	Warning	Ensures anonymous functions are passed where required
must_be_anonymous_or_error	Error	Same as above, but as error
must_be_strong_ref	Warning	Ensures strong-referenced variables are passed (for weak listener patterns)
must_be_strong_ref_or_error	Error	Same as above, but as error
must_handle_return	Warning	Ensures return values are handled
must_handle_return_or_error	Error	Same as above, but as error
no_futures	Warning	Prevents Future usage in annotated scopes
no_futures_or_error	Error	Same as above, but as error
must_use_unsafe_wrapper	Warning	Ensures unsafe calls are wrapped in UNSAFE()
must_use_unsafe_wrapper_or_error	Error	Same as above, but as error

Installation

Add to your pubspec.yaml:

dev_dependencies:
  custom_lint: any
  df_safer_dart_lints: any
  df_safer_dart_annotations: any  # Optional: for annotation-based rules

Enable in analysis_options.yaml:

analyzer:
  plugins:
    - custom_lint

# Optional: configure individual rules
custom_lint:
  rules:
    - must_use_outcome_or_error: true
    - no_future_outcome_type_or_error: true
    - must_await_all_futures: true
    - must_be_anonymous: true
    - must_use_unsafe_wrapper_or_error: true
    - no_futures: true

# Recommended: suppress warnings for UNSAFE label usage
errors:
  unused_label: ignore
  non_constant_identifier_names: ignore

Usage Example

import 'package:df_safer_dart/df_safer_dart.dart';

void main() {
  // Error: must_use_outcome_or_error
  // The result must be handled
  fetchData();  // ❌ Triggers lint error

  // OK: Result is handled
  final result = fetchData();  // ✅
  result.map((data) => print(data)).end();  // ✅

  // Error: no_future_outcome_type_or_error
  // Don't use Future<Result<T>>
  Future<Result<String>> bad() async { ... }  // ❌ Use Async<String> instead
}

Async<String> fetchData() {
  return Async(() async {
    return 'data';
  });
}

Related Packages

• df_safer_dart - Core safety types (Option, Result, Resolvable)
• df_safer_dart_annotations - Annotations for these lint rules
• custom_lint - Required for running custom lints

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🔍 For more information, refer to the API reference.

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💬 Contributing and Discussions

This is an open-source project, and we warmly welcome contributions from everyone, regardless of experience level. Whether you're a seasoned developer or just starting out, contributing to this project is a fantastic way to learn, share your knowledge, and make a meaningful impact on the community.

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LICENSE

This project is released under the MIT License. See LICENSE for more information.