[**@jupyterlite**](../../../README.md)

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[@jupyterlite](../../../README.md) / [@jupyterlite/services](../README.md) / IKernelSpecs

# Interface: IKernelSpecs

Defined in: [packages/services/src/kernel/tokens.ts:134](https://github.com/jupyterlite/jupyterlite/blob/14439ec34e3cade5baa221a050277e15da9d0c06/packages/services/src/kernel/tokens.ts#L134)

The interface for the kernel specs service.

## Properties

### changed

> `readonly` **changed**: `ISignal`\<`IKernelSpecs`, `null` \| `ISpecModels`\>

Defined in: [packages/services/src/kernel/tokens.ts:160](https://github.com/jupyterlite/jupyterlite/blob/14439ec34e3cade5baa221a050277e15da9d0c06/packages/services/src/kernel/tokens.ts#L160)

Signal emitted when the specs change.

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### defaultKernelName

> `readonly` **defaultKernelName**: `string`

Defined in: [packages/services/src/kernel/tokens.ts:150](https://github.com/jupyterlite/jupyterlite/blob/14439ec34e3cade5baa221a050277e15da9d0c06/packages/services/src/kernel/tokens.ts#L150)

Get the default kernel name.

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### factories

> `readonly` **factories**: [`KernelFactories`](../namespaces/KernelSpecs/type-aliases/KernelFactories.md)

Defined in: [packages/services/src/kernel/tokens.ts:155](https://github.com/jupyterlite/jupyterlite/blob/14439ec34e3cade5baa221a050277e15da9d0c06/packages/services/src/kernel/tokens.ts#L155)

Get the kernel factories for the current kernels.

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### register()

> **register**: (`options`) => `void`

Defined in: [packages/services/src/kernel/tokens.ts:167](https://github.com/jupyterlite/jupyterlite/blob/14439ec34e3cade5baa221a050277e15da9d0c06/packages/services/src/kernel/tokens.ts#L167)

Register a new kernel spec

#### Parameters

##### options

[`IKernelOptions`](../namespaces/KernelSpecs/interfaces/IKernelOptions.md)

The kernel spec options.

#### Returns

`void`

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### specs

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

Defined in: [packages/services/src/kernel/tokens.ts:145](https://github.com/jupyterlite/jupyterlite/blob/14439ec34e3cade5baa221a050277e15da9d0c06/packages/services/src/kernel/tokens.ts#L145)

Get the kernel specs.