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

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

# Class: KernelSpecs

Defined in: [packages/services/src/kernel/kernelspecs.ts:14](https://github.com/jupyterlite/jupyterlite/blob/14439ec34e3cade5baa221a050277e15da9d0c06/packages/services/src/kernel/kernelspecs.ts#L14)

A class to register in-browser kernel specs.

## Implements

- [`IKernelSpecs`](../interfaces/IKernelSpecs.md)

## Constructors

### Constructor

> **new KernelSpecs**(): `KernelSpecs`

#### Returns

`KernelSpecs`

## Accessors

### changed

#### Get Signature

> **get** **changed**(): `ISignal`\<[`IKernelSpecs`](../interfaces/IKernelSpecs.md), `null` \| `ISpecModels`\>

Defined in: [packages/services/src/kernel/kernelspecs.ts:54](https://github.com/jupyterlite/jupyterlite/blob/14439ec34e3cade5baa221a050277e15da9d0c06/packages/services/src/kernel/kernelspecs.ts#L54)

Signal emitted when the specs change.

##### Returns

`ISignal`\<[`IKernelSpecs`](../interfaces/IKernelSpecs.md), `null` \| `ISpecModels`\>

Signal emitted when the specs change.

#### Implementation of

[`IKernelSpecs`](../interfaces/IKernelSpecs.md).[`changed`](../interfaces/IKernelSpecs.md#changed)

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### defaultKernelName

#### Get Signature

> **get** **defaultKernelName**(): `string`

Defined in: [packages/services/src/kernel/kernelspecs.ts:32](https://github.com/jupyterlite/jupyterlite/blob/14439ec34e3cade5baa221a050277e15da9d0c06/packages/services/src/kernel/kernelspecs.ts#L32)

Get the default kernel name.

##### Returns

`string`

Get the default kernel name.

#### Implementation of

[`IKernelSpecs`](../interfaces/IKernelSpecs.md).[`defaultKernelName`](../interfaces/IKernelSpecs.md#defaultkernelname)

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### factories

#### Get Signature

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

Defined in: [packages/services/src/kernel/kernelspecs.ts:47](https://github.com/jupyterlite/jupyterlite/blob/14439ec34e3cade5baa221a050277e15da9d0c06/packages/services/src/kernel/kernelspecs.ts#L47)

Get the kernel factories for the current kernels.

##### Returns

[`KernelFactories`](../namespaces/KernelSpecs/type-aliases/KernelFactories.md)

Get the kernel factories for the current kernels.

#### Implementation of

[`IKernelSpecs`](../interfaces/IKernelSpecs.md).[`factories`](../interfaces/IKernelSpecs.md#factories)

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### specs

#### Get Signature

> **get** **specs**(): `null` \| `ISpecModels`

Defined in: [packages/services/src/kernel/kernelspecs.ts:18](https://github.com/jupyterlite/jupyterlite/blob/14439ec34e3cade5baa221a050277e15da9d0c06/packages/services/src/kernel/kernelspecs.ts#L18)

Get the kernel specs.

##### Returns

`null` \| `ISpecModels`

Get the kernel specs.

#### Implementation of

[`IKernelSpecs`](../interfaces/IKernelSpecs.md).[`specs`](../interfaces/IKernelSpecs.md#specs)

## Methods

### register()

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

Defined in: [packages/services/src/kernel/kernelspecs.ts:63](https://github.com/jupyterlite/jupyterlite/blob/14439ec34e3cade5baa221a050277e15da9d0c06/packages/services/src/kernel/kernelspecs.ts#L63)

Register a new kernel spec

#### Parameters

##### options

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

The options to register a new kernel.

#### Returns

`void`

#### Implementation of

[`IKernelSpecs`](../interfaces/IKernelSpecs.md).[`register`](../interfaces/IKernelSpecs.md#register)