== Why is this an issue?

Unnecessary imports refer to importing types that are not used or referenced anywhere in the code.

include::../description.adoc[]

== How to fix it

While it's not difficult to remove these unneeded lines manually, modern code editors support the removal of every unnecessary import with a single click from every file of the project.

=== Code examples

==== Noncompliant code example

[source,dart,diff-id=1,diff-type=noncompliant]
----
import 'package:dart_hello_world/dart_hello_world.dart' as dart_hello_world;
import 'package:dart_hello_world/dart_hello_world.dart2'; // Noncompliant, this import is unused

void main(List<String> arguments) {
  print('Hello world: ${dart_hello_world.calculate()}!');
  return;
}
----

==== Compliant solution

[source,dart,diff-id=1,diff-type=compliant]
----
import 'package:dart_hello_world/dart_hello_world.dart' as dart_hello_world;

void main(List<String> arguments) {
  print('Hello world: ${dart_hello_world.calculate()}!');
  return;
}
----

== Resources

* https://dart.dev/tools/diagnostic-messages?utm_source=dartdev&utm_medium=redir&utm_id=diagcode&utm_content=unnecessary_cast#unused_import[Dart compiler diagnostic]

=== Related rules

* S1481 - Unused local variables should be removed