# Interface: `IKernelSpecs`

[@jupyterlite/kernel](../modules/jupyterlite_kernel.md).IKernelSpecs

The interface for the kernel specs service.

## Properties

### `defaultKernelName`

> `Readonly` **`defaultKernelName`**: `string`

Get the default kernel name.

#### Defined in

[packages/kernel/src/tokens.ts:136](https://github.com/jupyterlite/jupyterlite/blob/7971e0aa/packages/kernel/src/tokens.ts#L136)

### `factories`

> `Readonly` **`factories`**:
> [`KernelFactories`](../modules/jupyterlite_kernel.KernelSpecs.md#kernelfactories)

Get the kernel factories for the current kernels.

#### Defined in

[packages/kernel/src/tokens.ts:141](https://github.com/jupyterlite/jupyterlite/blob/7971e0aa/packages/kernel/src/tokens.ts#L141)

### `register`

> **`register`**: (`options`:
> [`IKernelOptions`](jupyterlite_kernel.KernelSpecs.IKernelOptions.md)) => `void`

#### Type declaration

> (`options`): `void`

Register a new kernel spec

##### Parameters

| Name      | Type                                                                 | Description              |
| :-------- | :------------------------------------------------------------------- | :----------------------- |
| `options` | [`IKernelOptions`](jupyterlite_kernel.KernelSpecs.IKernelOptions.md) | The kernel spec options. |

##### Returns

`void`

#### Defined in

[packages/kernel/src/tokens.ts:148](https://github.com/jupyterlite/jupyterlite/blob/7971e0aa/packages/kernel/src/tokens.ts#L148)

### `specs`

> `Readonly` **`specs`**: `null` \| `ISpecModels`

Get the kernel specs.

#### Defined in

[packages/kernel/src/tokens.ts:131](https://github.com/jupyterlite/jupyterlite/blob/7971e0aa/packages/kernel/src/tokens.ts#L131)