Injector is a simple dependency injection lib for Dart.
It does not replace a complex dependency injection framework like Dagger, but it provides the basics that most apps need. Feature requests are welcomed!
Internally the injector is a singleton that stores instances and builders in a Map.
Use registerDependency<Type>() to register the dependency.
Never ever try to register or get dependencies without the generic type! Dart allows it, but we don't ;)
All instances are lazy loaded, meaning that at the time you request the dependency the instance is created.
Get your dependency using get<Type>().
A simple usage example:
// Register a dependency (Every time a new instance)
injector.registerDependency<Car>(() {
var engine = injector.get<Engine>();
var fuel = injector.get<Fuel>();
var driver = injector.get<Driver>();
return CarImpl(engine,fuel,driver);
});
// Register a singleton
injector.registerSingleton<Car>(() {
var engine = injector.get<Engine>();
var fuel = injector.get<Fuel>();
var driver = injector.get<Driver>();
return CarImpl(engine,fuel,driver);
});
// Use custom Factories by extending [Factory].
injector.register(CustomFactory(() => Engine()));
// Register your dependencies / singletons in the __main.dart__ file
If you have an issue with getting dependencies from the injector, check that imports of your dependencies classes are absolute.
Good: import 'package:<project_name>/some/package/<file_name>.dart';
Bad: import '../../some/package/<file_name>.dart';
Please file feature requests and bugs at the issue tracker.