# Dependency injection

If your service uses a dependency injection provider and you want to use it to resolve class based handlers and workflows, you can provide an adapter to **@node-ts/bus-core** for it to use.

This is provided as an adapter passed using **.withContainer()** to the configuration.

This example uses [inversify](https://www.npmjs.com/package/inversify), but any IoC container that supports resolving instances via a class type will work.

```typescript
import { Bus, ClassConstructor } from '@node-ts/bus-core'
import { Container } from 'inversify'

const start = async () => {
  const container = new Container()

  const bus = await Bus.configure()
    .withContainer({
      get <T>(type: ClassConstructor<T>) {
        return container.get<T>(type)
      }
    })
    .initialize()
}
```


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