Dependency Injection Container#

Coop uses BottleJS for dependency injection.

Why Dependency Injection?#

• Enables mocking services in tests (required for ESM modules)
• Supports runtime injection based on environment or feature flags
• Makes dependencies explicit in the source code

How It Works#

Services are registered by name in the container. Each name acts as an interface that can have different implementations:

// Register a service
bottle.service('MyService', MyServiceImpl);

// Inject into a class
class ActionAPI {
  constructor(private readonly myService: Dependencies['MyService']) {}
}

export default inject(['MyService'], ActionAPI);

Why BottleJS?#

BottleJS was chosen over alternatives like Inversify because it supports injecting functions and scalar values, not just class instances.