# InternalCoreModule

**Kind:** Class

**Source:** [`packages/core/injector/internal-core-module/internal-core-module.ts`](https://github.com/nestjs/nest/blob/master/packages/core/injector/internal-core-module/internal-core-module.ts#L16)

**Part of:** [Core](subsystem-packages-core)

`InternalCoreModule` is a framework-internal global module that registers core dependency-injection providers used by the application container. Its `register()` method returns a `DynamicModule`, allowing the framework to supply container-specific services during application initialization.

## Methods

| Method | Signature | Returns |
|---|---|---|
| `register` | `register(providers: Array<ValueProvider | FactoryProvider | ExistingProvider>)` | `DynamicModule` |

## Diagram

```mermaid
graph LR
  A[Application Bootstrap] --> B[InternalCoreModule.register()]
  B --> C[DynamicModule]
  C --> D[Core DI Providers]
  D --> E[Application Injector / Container]
  E --> F[Framework Services]
```

## Usage

```ts
import { Module } from '@nestjs/common';
import { InternalCoreModule } from './injector/internal-core-module/internal-core-module';

@Module({
  imports: [
    // Normally registered internally by the framework bootstrap process.
    InternalCoreModule.register(),
  ],
})
export class AppModule {}
```

## AI Coding Instructions

- Treat `InternalCoreModule` as framework infrastructure; application modules should generally not import it directly.
- Keep `register()` focused on returning a valid `DynamicModule` and registering only core container providers.
- Ensure providers added during registration are compatible with the injector lifecycle and scope rules.
- Preserve the module’s global/core role when changing exports or registered providers.
- Prefer integrating new framework-level services through the bootstrap/container setup rather than manually instantiating them.

## Relationships

- IMPORTS → `DynamicModule`
- IMPORTS → `Global`
- IMPORTS → `Module`
- IMPORTS → `ExistingProvider`
- IMPORTS → `FactoryProvider`
- IMPORTS → `ValueProvider`