--- lang: en title: 'API docs: service-proxy.servicemixin' keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI sidebar: lb4_sidebar editurl: https://github.com/strongloop/loopback-next/tree/master/packages/service-proxy permalink: /doc/en/lb4/apidocs.service-proxy.servicemixin.html --- [Home](./index.md) > [@loopback/service-proxy](./service-proxy.md) > [ServiceMixin](./service-proxy.servicemixin.md) ## ServiceMixin() function A mixin class for Application that creates a .serviceProvider() function to register a service automatically. Also overrides component function to allow it to register repositories automatically. Signature: ```typescript export declare function ServiceMixin>(superClass: T): { new (...args: any[]): { serviceProvider(provider: Constructor>, nameOrOptions?: string | ServiceOptions | undefined): Binding; component(componentCtor: Constructor, nameOrOptions?: string | BindingFromClassOptions | undefined): Binding; mountComponentServices(component: Constructor, componentBindingKey?: BindingAddress | undefined): void; readonly options: loopbackContext.ApplicationConfig; readonly state: string; controller: (controllerCtor: loopbackContext.ControllerClass, nameOrOptions?: string | BindingFromClassOptions | undefined) => Binding; server: (ctor: Constructor, nameOrOptions?: string | BindingFromClassOptions | undefined) => Binding; servers: (ctors: Constructor[]) => Binding[]; getServer: (target: string | Constructor) => Promise; init: () => Promise; onInit: (fn: () => loopbackContext.ValueOrPromise) => Binding; start: () => Promise; onStart: (fn: () => loopbackContext.ValueOrPromise) => Binding; stop: () => Promise; onStop: (fn: () => loopbackContext.ValueOrPromise) => Binding; setMetadata: (metadata: loopbackContext.ApplicationMetadata) => void; lifeCycleObserver: (ctor: Constructor, nameOrOptions?: string | BindingFromClassOptions | undefined) => Binding; service: (cls: loopbackContext.ServiceOrProviderClass, nameOrOptions?: string | ServiceOptions | undefined) => Binding; interceptor: (interceptor: loopbackContext.Interceptor | Constructor>, nameOrOptions?: string | loopbackContext.InterceptorBindingOptions | undefined) => Binding; readonly name: string; readonly subscriptionManager: loopbackContext.ContextSubscriptionManager; scope: loopbackContext.BindingScope; readonly parent: loopbackContext.Context | undefined; emitEvent: (type: string, event: T_6) => void; emitError: (err: unknown) => void; bind: (key: BindingAddress) => Binding; add: (binding: Binding) => Application; configure: (key?: BindingAddress | undefined) => Binding; getConfigAsValueOrPromise: (key: BindingAddress, propertyPath?: string | undefined, resolutionOptions?: loopbackContext.ResolutionOptions | undefined) => loopbackContext.ValueOrPromise; getConfig: (key: BindingAddress, propertyPath?: string | undefined, resolutionOptions?: loopbackContext.ResolutionOptions | undefined) => Promise; getConfigSync: (key: BindingAddress, propertyPath?: string | undefined, resolutionOptions?: loopbackContext.ResolutionOptions | undefined) => ConfigValueType_3 | undefined; unbind: (key: BindingAddress) => boolean; subscribe: (observer: loopbackContext.ContextEventObserver) => loopbackContext.Subscription; unsubscribe: (observer: loopbackContext.ContextEventObserver) => boolean; close: () => void; isSubscribed: (observer: loopbackContext.ContextObserver) => boolean; createView: (filter: loopbackContext.BindingFilter, comparator?: loopbackContext.BindingComparator | undefined) => loopbackContext.ContextView; contains: (key: BindingAddress) => boolean; isBound: (key: BindingAddress) => boolean; getOwnerContext: (keyOrBinding: BindingAddress | Readonly>) => loopbackContext.Context | undefined; getScopedContext: (scope: loopbackContext.BindingScope.APPLICATION | loopbackContext.BindingScope.SERVER | loopbackContext.BindingScope.REQUEST) => loopbackContext.Context | undefined; getResolutionContext: (binding: Readonly>) => loopbackContext.Context | undefined; isVisibleTo: (ctx: loopbackContext.Context) => boolean; find: (pattern?: string | RegExp | loopbackContext.BindingFilter | undefined) => Readonly>[]; findByTag: (tagFilter: RegExp | loopbackContext.BindingTag) => Readonly>[]; get: { (keyWithPath: BindingAddress, session?: loopbackContext.ResolutionSession | undefined): Promise; (keyWithPath: BindingAddress, options: loopbackContext.ResolutionOptions): Promise; }; getSync: { (keyWithPath: BindingAddress, session?: loopbackContext.ResolutionSession | undefined): ValueType_5; (keyWithPath: BindingAddress, options?: loopbackContext.ResolutionOptions | undefined): ValueType_6 | undefined; }; getBinding: { (key: BindingAddress): Binding; (key: BindingAddress, options?: { optional?: boolean | undefined; } | undefined): Binding | undefined; }; findOrCreateBinding: (key: BindingAddress, policy?: loopbackContext.BindingCreationPolicy | undefined) => Binding; getValueOrPromise: (keyWithPath: BindingAddress, optionsOrSession?: loopbackContext.ResolutionOptionsOrSession | undefined) => loopbackContext.ValueOrPromise; toJSON: () => loopbackContext.JSONObject; inspect: (options?: loopbackContext.ContextInspectOptions | undefined) => loopbackContext.JSONObject; on: { (eventName: "bind" | "unbind", listener: loopbackContext.ContextEventListener): Application; (event: string | symbol, listener: (...args: any[]) => void): Application; }; once: { (eventName: "bind" | "unbind", listener: loopbackContext.ContextEventListener): Application; (event: string | symbol, listener: (...args: any[]) => void): Application; }; addListener: (event: string | symbol, listener: (...args: any[]) => void) => Application; removeListener: (event: string | symbol, listener: (...args: any[]) => void) => Application; off: (event: string | symbol, listener: (...args: any[]) => void) => Application; removeAllListeners: (event?: string | symbol | undefined) => Application; setMaxListeners: (n: number) => Application; getMaxListeners: () => number; listeners: (event: string | symbol) => Function[]; rawListeners: (event: string | symbol) => Function[]; emit: (event: string | symbol, ...args: any[]) => boolean; listenerCount: (type: string | symbol) => number; prependListener: (event: string | symbol, listener: (...args: any[]) => void) => Application; prependOnceListener: (event: string | symbol, listener: (...args: any[]) => void) => Application; eventNames: () => (string | symbol)[]; }; } & T; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | superClass | T | Application class | Returns: { new (...args: any\[\]): { serviceProvider<S>(provider: [Constructor](./context.constructor.md)<[Provider](./context.provider.md)<S>>, nameOrOptions?: string \| [ServiceOptions](./core.serviceoptions.md) \| undefined): [Binding](./context.binding.md)<S>; component<C extends [Component](./core.component.md) = [Component](./core.component.md)>(componentCtor: [Constructor](./context.constructor.md)<C>, nameOrOptions?: string \| [BindingFromClassOptions](./context.bindingfromclassoptions.md) \| undefined): [Binding](./context.binding.md)<C>; mountComponentServices<C\_1 extends [Component](./core.component.md) = [Component](./core.component.md)>(component: [Constructor](./context.constructor.md)<C\_1>, componentBindingKey?: [BindingAddress](./context.bindingaddress.md)<C\_1> \| undefined): void; readonly options: loopbackContext.[ApplicationConfig](./core.applicationconfig.md); readonly state: string; controller: <T\_1>(controllerCtor: loopbackContext.[ControllerClass](./core.controllerclass.md)<T\_1>, nameOrOptions?: string \| [BindingFromClassOptions](./context.bindingfromclassoptions.md) \| undefined) => [Binding](./context.binding.md)<T\_1>; server: <T\_2 extends loopbackContext.[Server](./core.server.md)>(ctor: [Constructor](./context.constructor.md)<T\_2>, nameOrOptions?: string \| [BindingFromClassOptions](./context.bindingfromclassoptions.md) \| undefined) => [Binding](./context.binding.md)<T\_2>; servers: <T\_3 extends loopbackContext.[Server](./core.server.md)>(ctors: [Constructor](./context.constructor.md)<T\_3>\[\]) => [Binding](./context.binding.md)<any>\[\]; getServer: <T\_4 extends loopbackContext.[Server](./core.server.md)>(target: string \| [Constructor](./context.constructor.md)<T\_4>) => Promise<T\_4>; init: () => Promise<void>; onInit: (fn: () => loopbackContext.[ValueOrPromise](./context.valueorpromise.md)<void>) => [Binding](./context.binding.md)<loopbackContext.[LifeCycleObserver](./core.lifecycleobserver.md)>; start: () => Promise<void>; onStart: (fn: () => loopbackContext.[ValueOrPromise](./context.valueorpromise.md)<void>) => [Binding](./context.binding.md)<loopbackContext.[LifeCycleObserver](./core.lifecycleobserver.md)>; stop: () => Promise<void>; onStop: (fn: () => loopbackContext.[ValueOrPromise](./context.valueorpromise.md)<void>) => [Binding](./context.binding.md)<loopbackContext.[LifeCycleObserver](./core.lifecycleobserver.md)>; setMetadata: (metadata: loopbackContext.[ApplicationMetadata](./core.applicationmetadata.md)) => void; lifeCycleObserver: <T\_5 extends loopbackContext.[LifeCycleObserver](./core.lifecycleobserver.md)>(ctor: [Constructor](./context.constructor.md)<T\_5>, nameOrOptions?: string \| [BindingFromClassOptions](./context.bindingfromclassoptions.md) \| undefined) => [Binding](./context.binding.md)<T\_5>; service: <S\_2>(cls: loopbackContext.[ServiceOrProviderClass](./core.serviceorproviderclass.md)<S\_2>, nameOrOptions?: string \| [ServiceOptions](./core.serviceoptions.md) \| undefined) => [Binding](./context.binding.md)<S\_2>; interceptor: (interceptor: loopbackContext.[Interceptor](./context.interceptor.md) \| [Constructor](./context.constructor.md)<[Provider](./context.provider.md)<loopbackContext.[Interceptor](./context.interceptor.md)>>, nameOrOptions?: string \| loopbackContext.[InterceptorBindingOptions](./context.interceptorbindingoptions.md) \| undefined) => [Binding](./context.binding.md)<loopbackContext.[Interceptor](./context.interceptor.md)>; readonly name: string; readonly subscriptionManager: loopbackContext.[ContextSubscriptionManager](./context.contextsubscriptionmanager.md); scope: loopbackContext.[BindingScope](./context.bindingscope.md); readonly parent: loopbackContext.[Context](./context.context.md) \| undefined; emitEvent: <T\_6 extends loopbackContext.[ContextEvent](./context.contextevent.md)>(type: string, event: T\_6) => void; emitError: (err: unknown) => void; bind: <ValueType = any>(key: [BindingAddress](./context.bindingaddress.md)<ValueType>) => [Binding](./context.binding.md)<ValueType>; add: (binding: [Binding](./context.binding.md)<unknown>) => [Application](./core.application.md); configure: <ConfigValueType = any>(key?: [BindingAddress](./context.bindingaddress.md)<unknown> \| undefined) => [Binding](./context.binding.md)<ConfigValueType>; getConfigAsValueOrPromise: <ConfigValueType\_1>(key: [BindingAddress](./context.bindingaddress.md)<unknown>, propertyPath?: string \| undefined, resolutionOptions?: loopbackContext.[ResolutionOptions](./context.resolutionoptions.md) \| undefined) => loopbackContext.[ValueOrPromise](./context.valueorpromise.md)<ConfigValueType\_1 \| undefined>; getConfig: <ConfigValueType\_2>(key: [BindingAddress](./context.bindingaddress.md)<unknown>, propertyPath?: string \| undefined, resolutionOptions?: loopbackContext.[ResolutionOptions](./context.resolutionoptions.md) \| undefined) => Promise<ConfigValueType\_2 \| undefined>; getConfigSync: <ConfigValueType\_3>(key: [BindingAddress](./context.bindingaddress.md)<unknown>, propertyPath?: string \| undefined, resolutionOptions?: loopbackContext.[ResolutionOptions](./context.resolutionoptions.md) \| undefined) => ConfigValueType\_3 \| undefined; unbind: (key: [BindingAddress](./context.bindingaddress.md)<unknown>) => boolean; subscribe: (observer: loopbackContext.[ContextEventObserver](./context.contexteventobserver.md)) => loopbackContext.[Subscription](./context.subscription.md); unsubscribe: (observer: loopbackContext.[ContextEventObserver](./context.contexteventobserver.md)) => boolean; close: () => void; isSubscribed: (observer: loopbackContext.[ContextObserver](./context.contextobserver.md)) => boolean; createView: <T\_7 = unknown>(filter: loopbackContext.[BindingFilter](./context.bindingfilter.md), comparator?: loopbackContext.[BindingComparator](./context.bindingcomparator.md) \| undefined) => loopbackContext.[ContextView](./context.contextview.md)<T\_7>; contains: (key: [BindingAddress](./context.bindingaddress.md)<unknown>) => boolean; isBound: (key: [BindingAddress](./context.bindingaddress.md)<unknown>) => boolean; getOwnerContext: (keyOrBinding: [BindingAddress](./context.bindingaddress.md)<unknown> \| Readonly<[Binding](./context.binding.md)<unknown>>) => loopbackContext.[Context](./context.context.md) \| undefined; getScopedContext: (scope: loopbackContext.[BindingScope.APPLICATION](./context.bindingscope.application.md) \| loopbackContext.[BindingScope.SERVER](./context.bindingscope.server.md) \| loopbackContext.[BindingScope.REQUEST](./context.bindingscope.request.md)) => loopbackContext.[Context](./context.context.md) \| undefined; getResolutionContext: (binding: Readonly<[Binding](./context.binding.md)<unknown>>) => loopbackContext.[Context](./context.context.md) \| undefined; isVisibleTo: (ctx: loopbackContext.[Context](./context.context.md)) => boolean; find: <ValueType\_1 = any>(pattern?: string \| RegExp \| loopbackContext.[BindingFilter](./context.bindingfilter.md) \| undefined) => Readonly<[Binding](./context.binding.md)<ValueType\_1>>\[\]; findByTag: <ValueType\_2 = any>(tagFilter: RegExp \| loopbackContext.[BindingTag](./context.bindingtag.md)) => Readonly<[Binding](./context.binding.md)<ValueType\_2>>\[\]; get: { <ValueType\_3>(keyWithPath: [BindingAddress](./context.bindingaddress.md)<ValueType\_3>, session?: loopbackContext.[ResolutionSession](./context.resolutionsession.md) \| undefined): Promise<ValueType\_3>; <ValueType\_4>(keyWithPath: [BindingAddress](./context.bindingaddress.md)<ValueType\_4>, options: loopbackContext.[ResolutionOptions](./context.resolutionoptions.md)): Promise<ValueType\_4 \| undefined>; }; getSync: { <ValueType\_5>(keyWithPath: [BindingAddress](./context.bindingaddress.md)<ValueType\_5>, session?: loopbackContext.[ResolutionSession](./context.resolutionsession.md) \| undefined): ValueType\_5; <ValueType\_6>(keyWithPath: [BindingAddress](./context.bindingaddress.md)<ValueType\_6>, options?: loopbackContext.[ResolutionOptions](./context.resolutionoptions.md) \| undefined): ValueType\_6 \| undefined; }; getBinding: { <ValueType\_7 = any>(key: [BindingAddress](./context.bindingaddress.md)<ValueType\_7>): [Binding](./context.binding.md)<ValueType\_7>; <ValueType\_8>(key: [BindingAddress](./context.bindingaddress.md)<ValueType\_8>, options?: { optional?: boolean \| undefined; } \| undefined): [Binding](./context.binding.md)<ValueType\_8> \| undefined; }; findOrCreateBinding: <T\_8>(key: [BindingAddress](./context.bindingaddress.md)<T\_8>, policy?: loopbackContext.[BindingCreationPolicy](./context.bindingcreationpolicy.md) \| undefined) => [Binding](./context.binding.md)<T\_8>; getValueOrPromise: <ValueType\_9>(keyWithPath: [BindingAddress](./context.bindingaddress.md)<ValueType\_9>, optionsOrSession?: loopbackContext.[ResolutionOptionsOrSession](./context.resolutionoptionsorsession.md) \| undefined) => loopbackContext.[ValueOrPromise](./context.valueorpromise.md)<ValueType\_9 \| undefined>; toJSON: () => loopbackContext.[JSONObject](./context.jsonobject.md); inspect: (options?: loopbackContext.[ContextInspectOptions](./context.contextinspectoptions.md) \| undefined) => loopbackContext.[JSONObject](./context.jsonobject.md); on: { (eventName: "bind" \| "unbind", listener: loopbackContext.[ContextEventListener](./context.contexteventlistener.md)): [Application](./core.application.md); (event: string \| symbol, listener: (...args: any\[\]) => void): [Application](./core.application.md); }; once: { (eventName: "bind" \| "unbind", listener: loopbackContext.[ContextEventListener](./context.contexteventlistener.md)): [Application](./core.application.md); (event: string \| symbol, listener: (...args: any\[\]) => void): [Application](./core.application.md); }; addListener: (event: string \| symbol, listener: (...args: any\[\]) => void) => [Application](./core.application.md); removeListener: (event: string \| symbol, listener: (...args: any\[\]) => void) => [Application](./core.application.md); off: (event: string \| symbol, listener: (...args: any\[\]) => void) => [Application](./core.application.md); removeAllListeners: (event?: string \| symbol \| undefined) => [Application](./core.application.md); setMaxListeners: (n: number) => [Application](./core.application.md); getMaxListeners: () => number; listeners: (event: string \| symbol) => Function\[\]; rawListeners: (event: string \| symbol) => Function\[\]; emit: (event: string \| symbol, ...args: any\[\]) => boolean; listenerCount: (type: string \| symbol) => number; prependListener: (event: string \| symbol, listener: (...args: any\[\]) => void) => [Application](./core.application.md); prependOnceListener: (event: string \| symbol, listener: (...args: any\[\]) => void) => [Application](./core.application.md); eventNames: () => (string \| symbol)\[\]; }; } & T A new class that extends the super class with service proxy related methods ## Example ```ts class MyApplication extends ServiceMixin(Application) {} ``` Please note: the members in the mixin function are documented in a dummy class called ServiceMixinDoc