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--- lang: en title: 'API docs: core.component' keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI sidebar: lb4_sidebar editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/core permalink: /doc/en/lb4/apidocs.core.component.html ---  [Home](./index.md) > [@loopback/core](./core.md) > [Component](./core.component.md) ## Component interface A component declares a set of artifacts so that they can be contributed to an application as a group **Signature:** ```typescript export interface Component ``` ## Properties | Property | Modifiers | Type | Description | | --- | --- | --- | --- | | [bindings?](./core.component.bindings.md) | | [Binding](./context.binding.md)\[\] | _(Optional)_ An array of bindings to be aded to the application context. | | [classes?](./core.component.classes.md) | | [ClassMap](./core.classmap.md) | _(Optional)_ A map of classes to be bound to the application context. | | [controllers?](./core.component.controllers.md) | | [ControllerClass](./core.controllerclass.md)\[\] | _(Optional)_ An array of controller classes | | [lifeCycleObservers?](./core.component.lifecycleobservers.md) | | [Constructor](./context.constructor.md)<[LifeCycleObserver](./core.lifecycleobserver.md)>\[\] | _(Optional)_ | | [providers?](./core.component.providers.md) | | [ProviderMap](./core.providermap.md) | _(Optional)_ A map of providers to be bound to the application context | | [servers?](./core.component.servers.md) | | { \[name: string\]: [Constructor](./context.constructor.md)<[Server](./core.server.md)>; } | _(Optional)_ A map of name/class pairs for servers | | [services?](./core.component.services.md) | | [ServiceOrProviderClass](./core.serviceorproviderclass.md)\[\] | _(Optional)_ An array of service or provider classes |