# 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:149](https://github.com/jupyterlite/jupyterlite/blob/c78cc8d/packages/kernel/src/tokens.ts#L149)



### `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:154](https://github.com/jupyterlite/jupyterlite/blob/c78cc8d/packages/kernel/src/tokens.ts#L154)



### `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:161](https://github.com/jupyterlite/jupyterlite/blob/c78cc8d/packages/kernel/src/tokens.ts#L161)



### `specs`

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

Get the kernel specs.

#### Defined in

[packages/kernel/src/tokens.ts:144](https://github.com/jupyterlite/jupyterlite/blob/c78cc8d/packages/kernel/src/tokens.ts#L144)