The 10 Best Lints to Use in Your Flutter Project

Felipe Sales — Mon, 02 Jun 2025 14:26:45 +0000

prefer_const_declarations
Forces the use of const whenever possible.
🔧 Example: const myValue = 10;
💡 Improves performance, especially during widget build.

avoid_unnecessary_containers
Avoids using Container when it's not doing anything.
🔧 Replace it with Padding, SizedBox, DecoratedBox, etc.
💡 Reduces widget tree complexity.

avoid_print
Avoid using print() in production code.
🔧 Use Logger, debugPrint, or proper logging tools.
💡 Makes log control and maintenance easier.

prefer_single_quotes
Prefers single quotes (') over double quotes (").
🔧 Promotes code consistency.
💡 Follows the standard of most Dart/Flutter packages.

always_declare_return_types
Enforces declaring return types for functions.
🔧 Example: String getTitle() { ... }
💡 Improves readability and prevents potential errors.

unnecessary_const
Avoids using const where it's redundant (like inside another const).
🔧 Dart infers it automatically in many cases.
💡 Keeps your code cleaner and more concise.

no_literal_bool_comparisons
Avoids comparisons like if (isValid == true) or == false.
🔧 Instead, use if (isValid) or if (!isValid).
💡 Makes your code more direct and idiomatic.

use_key_in_widget_constructors
Ensures you add a Key to your custom widgets.
🔧 Helps control widget rebuilds in the widget tree.
💡 Prevents subtle bugs and improves performance.

unnecessary_lambdas
Avoids using lambdas when you can pass the function directly.
🔧 Instead of onPressed: () => doSomething(), use onPressed: doSomething.
💡 Results in cleaner and more readable code.

unnecessary_getters_setters
Avoids get and set methods that do nothing but return or assign a variable.
🔧 Access the field directly when there's no added logic.
💡 Simplifies code and avoids unnecessary abstractions.

By enabling these lints, you're not just following best practices - you're also making your Flutter codebase more robust, scalable, and professional. Happy coding! 🚀

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DEV Community: Felipe Sales

The 10 Best Lints to Use in Your Flutter Project