Complete Dependency InjectorDependency injection for Dart and Flutter

Hierarchical scopes, async services and a boilerplate-free ViewModel pattern, in two small packages.

Hierarchical injection

Nest injectors to match your app's structure. Children inherit their parent's services and can override or add their own.

Async from the start

Factories can return a Future, and services can finish setting up after construction. Anything that depends on them waits automatically.

Scoped singletons

Choose per factory whether an instance is shared app-wide or created once per scope, such as one per screen.

Flutter widgets and ViewModels

Put injectors in the widget tree and drive UI from service streams with built-in loading, ready and error states.

Two packages

Package	Use it for
`complete_dependency_injector`	The injector itself. Pure Dart, works anywhere.
`complete_dependency_injector_flutter`	Widgets that place injectors in the widget tree, plus the `DependenciesBuilder` ViewModel pattern.

At a glance

dart

// 1. Say which services this injector makes available.
final injector = Injector([
  Logger.DefaultProvider,
  GreetingService.DefaultProvider,
]);

// 2. Register how to build each one.
injector.registerFactories([
  Logger.Factory,
  GreetingService.Factory,
]);