This package contains a recommended set of lints for Flutter apps, packages, and plugins to encourage good coding practices.
This package is built on top of Dart's
recommended.yaml set of lints from
Lints are surfaced by the dart analyzer, which statically checks dart code.
Dart-enabled IDEs typically present the issues identified by the analyzer in
their UI. Alternatively, the analyzer can be invoked manually by running
Flutter apps, packages, and plugins created with
flutter create starting with
Flutter version 2.3.0 are already set up to use the lints defined in this
package. Entities created before that version can use these lints by following
- Depend on this package as a dev_dependency by running
flutter pub add --dev flutter_lints.
- Create an
analysis_options.yamlfile at the root of the package (alongside the
include: package:flutter_lints/flutter.yamlfrom it.
# This file configures the analyzer, which statically analyzes Dart code to # check for errors, warnings, and lints. # # The issues identified by the analyzer are surfaced in the UI of Dart-enabled # IDEs (https://dart.cn/tools#ides-and-editors). The analyzer can also be # invoked from the command line by running `flutter analyze`. # The following line activates a set of recommended lints for Flutter apps, # packages, and plugins designed to encourage good coding practices. include: package:flutter_lints/flutter.yaml linter: # The lint rules applied to this project can be customized in the # section below to disable rules from the `package:flutter_lints/flutter.yaml` # included above or to enable additional rules. A list of all available lints # and their documentation is published at # https://dart-lang.github.io/linter/lints/index.html. # # Instead of disabling a lint rule for the entire project in the # section below, it can also be suppressed for a single line of code # or a specific dart file by using the `// ignore: name_of_lint` and # `// ignore_for_file: name_of_lint` syntax on the line or in the file # producing the lint. rules: # avoid_print: false # Uncomment to disable the `avoid_print` rule # prefer_single_quotes: true # Uncomment to enable the `prefer_single_quotes` rule # Additional information about this file can be found at # https://dart.cn/guides/language/analysis-options
Adding new lints
Please file a lint proposal issue to suggest that an existing lint rule should be added to this package. The benefits and risks of adding a lint should be discussed on that issue with all stakeholders involved. The suggestions will be reviewed periodically (typically once a year). Following a review, the package will be updated with all lints that made the cut.
Adding a lint to the package may create new warnings for existing users and is therefore considered to be a breaking change, which will require a major version bump. To keep churn low, lints are not added one-by-one, but in one batch following a review of all accumulated suggestions since the previous review.