avoid_non_null_assertion_operator 1.8.0

A custom lint package to forbid the non-null assertion operator (!).

avoid_non_null_assertion_operator

A custom lint package for Dart/Flutter that helps enforce safer null handling by prohibiting the use of the non-null assertion operator (!).

Features

• Detects and reports usage of the non-null assertion operator (!)
• Helps enforce safer null handling practices
• Integrates with Dart's analyzer

Getting started

Run:

dart pub add --dev custom_lint avoid_non_null_assertion_operator

Or if using Flutter:

flutter pub add --dev custom_lint avoid_non_null_assertion_operator

Add this to your package's pubspec.yaml file:

dev_dependencies:
  custom_lint:
  avoid_non_null_assertion_operator:

Usage

Add the following to your analysis_options.yaml:

analyzer:
  plugins:
    - custom_lint
  errors:
    avoid_non_null_assertion_operator: error

The lint will now report errors for code like this:

String? nullable = "test";
String nonNullable = nullable!; // Error: Avoid using the non-null assertion operator (!)

Instead, use safer alternatives like:

String? nullable = "test";
String nonNullable = nullable ?? "default"; // Use null coalescing
// or
if (nullable != null) {
  String nonNullable = nullable; // Use null check
}

Additional information

This package is designed to help maintain safer null handling practices in Dart/Flutter projects. It encourages the use of explicit null checks and null coalescing operators instead of force-unwrapping nullable values.

For more information about null safety in Dart, visit the official documentation.