Implementing a Custom 'Dependency Injection' Container in Vue

A custom DI container uses a centralized registry (often via a Vue Plugin) to manage service instances, providing them to components via the Provide/Inject API.

While Provide/Inject is a form of DI, large enterprise apps often need a more structured approach (similar to InversifyJS or Angular's DI). You can architect a 'Service Locator' plugin that instantiates classes (like AnalyticsService or UserRepository) once and provides them at the app root. This allows for easy 'Mocking' during unit tests by providing a dummy service at the component level to override the global one.