# isDurable

**Kind:** Function

**Source:** [`packages/core/helpers/is-durable.ts`](https://github.com/nestjs/nest/blob/master/packages/core/helpers/is-durable.ts#L4)

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

## Signature

```ts
function isDurable(provider: Type<unknown>): boolean | undefined
```

## Parameters

| Name | Type |
|---|---|
| `provider` | `Type<unknown>` |

**Returns:** `boolean | undefined`

## Relationships

- IMPORTS → `SCOPE_OPTIONS_METADATA`
- IMPORTS → `Type`