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Description:

dart code linter

Dart Code Linter #

Dart Code Linter (DCL) is a powerful toolkit designed to enhance your development process by identifying and resolving issues within your Dart and Flutter code. Whether you're dealing with potential runtime bugs, violations of best practices, or styling concerns, DCL has got you covered. With a comprehensive collection of over 70 pre-built rules, you can effortlessly validate your code against a variety of expectations. Furthermore, DCL offers the flexibility to customize these rules to cater to your specific requirements, ensuring an optimized coding experience.
Links #

See CHANGELOG.md for major/breaking updates, and releases for a detailed version history.
To contribute, please read CONTRIBUTING.md first.
Please open an issue if anything is missing or unclear in this documentation.

Installation #
$ dart pub add --dev dart_code_linter

# or for a Flutter package
$ flutter pub add --dev dart_code_linter
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Basic configuration #
Add configuration to analysis_options.yaml and reload IDE to allow the analyzer to discover the plugin config.
Basic config example #
analyzer:
plugins:
- dart_code_linter

dart_code_linter:
rules:
- avoid-dynamic
- avoid-passing-async-when-sync-expected
- avoid-redundant-async
- avoid-unnecessary-type-assertions
- avoid-unnecessary-type-casts
- avoid-unrelated-type-assertions
- avoid-unused-parameters
- avoid-nested-conditional-expressions
- newline-before-return
- no-boolean-literal-compare
- no-empty-block
- prefer-trailing-comma
- prefer-conditional-expressions
- no-equal-then-else
- prefer-moving-to-variable
- prefer-match-file-name
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Basic config with metrics #
analyzer:
plugins:
- dart_code_linter

dart_code_linter:
metrics:
cyclomatic-complexity: 20
number-of-parameters: 4
maximum-nesting-level: 5
metrics-exclude:
- test/**
rules:
- avoid-dynamic
- avoid-passing-async-when-sync-expected
- avoid-redundant-async
- avoid-unnecessary-type-assertions
- avoid-unnecessary-type-casts
- avoid-unrelated-type-assertions
- avoid-unused-parameters
- avoid-nested-conditional-expressions
- newline-before-return
- no-boolean-literal-compare
- no-empty-block
- prefer-trailing-comma
- prefer-conditional-expressions
- no-equal-then-else
- prefer-moving-to-variable
- prefer-match-file-name
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Usage #
Analyzer plugin #
DCL can be used as a plugin for the Dart analyzer package providing additional rules. All issues produced by rules or anti-patterns will be highlighted in IDE.
Rules that marked with 🛠 have auto-fixes available through the IDE context menu. VS Code example:

CLI #
The package can be used as CLI and supports multiple commands:

Command
Example of use
Short description

analyze
dart run dart_code_linter:metrics analyze lib
Reports code metrics, rules and anti-patterns violations.

check-unnecessary-nullable
dart run dart_code_linter:metrics check-unnecessary-nullable lib
Checks unnecessary nullable parameters in functions, methods, constructors.

check-unused-files
dart run dart_code_linter:metrics check-unused-files lib
Checks unused *.dart files.

check-unused-l10n
dart run dart_code_linter:metrics check-unused-l10n lib
Check unused localization in *.dart files.

check-unused-code
dart run dart_code_linter:metrics check-unused-code lib
Checks unused code in *.dart files.

For additional help on any of the commands, enter dart run dart_code_linter:metrics help <command>
Note: if you're setting up DCL for multi-package repository (a.k.a. monorepo), it'll pick up analysis_options.yaml files correctly.
You can define one analysis_options.yaml at the root file.
Analyze
Reports code metrics, rules and anti-patterns violations. To execute the command, run
$ dart run dart_code_linter:metrics analyze lib

# or for a Flutter package
$ flutter pub run dart_code_linter:metrics analyze lib
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It will produce a result in one of the format:

Console
GitHub
Codeclimate
HTML
JSON

Check unnecessary nullable parameters
Checks unnecessary nullable parameters in functions, methods, constructors. To execute the command, run
$ dart run dart_code_linter:metrics check-unnecessary-nullable lib

# or for a Flutter package
$ flutter pub run dart_code_linter:metrics check-unnecessary-nullable lib
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It will produce a result in one of the format:

Console
JSON

Check unused files
Checks unused *.dart files. To execute the command, run
$ dart run dart_code_linter:metrics check-unused-files lib

# or for a Flutter package
$ flutter pub run dart_code_linter:metrics check-unused-files lib
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It will produce a result in one of the format:

Console
JSON

Check unused localization
Checks unused Dart class members, that encapsulates the app’s localized values.
An example of such class:
class ClassWithLocalization {
String get title {
return Intl.message(
'Hello World',
name: 'title',
desc: 'Title for the Demo application',
locale: localeName,
);
}
}
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To execute the command, run
$ dart run dart_code_linter:metrics check-unused-l10n lib

# or for a Flutter package
$ flutter pub run dart_code_linter:metrics check-unused-l10n lib
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It will produce a result in one of the format:

Console
JSON

Check unused code
Checks unused code in *.dart files. To execute the command, run
$ dart run dart_code_linter:metrics check-unused-code lib

# or for a Flutter package
$ flutter pub run dart_code_linter:metrics check-unused-code lib
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It will produce a result in one of the format:

Console
JSON

Troubleshooting #
Please read the following guide if the plugin is not working as you'd expect it to work.
Contributing #
If you are interested in contributing, please check out the contribution guidelines. Feedback and contributions are welcome!
License #
Dart Code Linter is licensed under the MIT