Optional class

A parameter metadata that marks a dependency as optional.

Injector provides null if the dependency is not found.

Example

class Engine {}

@Injectable()
class Car {
  final Engine engine;
  Car(@Optional() this.engine);
}

var injector = Injector.resolveAndCreate([Car]);
expect(injector.get(Car).engine, isNull);

Annotations

• @Target({TargetKind.parameter})

Constructors

Optional()

const

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited