zone_di 1.0.0

Dependency injection with a functional API that works without code generation, mirrors or passing around Injector objects.

zone_di

Dependency injection with a functional API that works without code generation, mirrors or passing around Injector objects.

Usage

The three main exports of this package are Token, provide() and inject(). Use tokens to declare dependencies that can be injected. Then associate values to your tokens with provide(), and read them with inject().

import 'package:zone_di/zone_di.dart';

final fooToken = Token<String>('my_package.fooToken');

class MyConsumer {
  final String foo;

  MyConsumer() : foo = inject(fooToken).toUpperCase();
}

void main() {
  provide(fooToken, 'Hello world', () {
    final consumer = MyConsumer();
    print(consumer.foo);
  });
}

There's also provideFactories() that constructs token values from the given factory functions and handles dependencies between the factories.

How it works

To make provide() arguments available in inject(), this package uses zones. That means it can avoid global mutable state and the edge cases that typically come with it. For a longer explanation, I wrote a blog post about it here.