{"id":197,"date":"2021-01-24T06:49:54","date_gmt":"2021-01-24T06:49:54","guid":{"rendered":"http:\/\/santosh-shah.com\/?p=197"},"modified":"2021-02-15T06:02:10","modified_gmt":"2021-02-15T06:02:10","slug":"what-is-injectable-decorator","status":"publish","type":"post","link":"https:\/\/santosh-shah.com\/blog\/what-is-injectable-decorator\/","title":{"rendered":"What is Injectable decorator?"},"content":{"rendered":"\n

Injectable decorator (@Injectable) marks a class as available to Injector for creation.<\/p>\n\n\n\n

import { Injectable } from '@angular\/core';\n\n@Injectable({\n  providedIn: 'root',\n})\nexport class UserService {\n}\n<\/code><\/pre>\n\n\n\n
The service itself is a class that the CLI generated and that’s decorated with @Injectable().<\/p>\n\n\n\n
What exactly does providedIn do?<\/h3>\n\n\n\n
Determines which injectors will provide the injectable, by either associating it with an @NgModule or other InjectorType, or by specifying that this injectable should be provided in the ‘root’ injector, which will be the application-level injector in most apps.<\/p>\n\n\n\n
providedIn: Type<any> | 'root' | null<\/code><\/pre>\n\n\n\n
providedIn: ‘root’
When you provide the service at the root level, Angular creates a single, shared instance of service and injects it into any class that asks for it. Registering the provider in the @Injectable() metadata also allows Angular to optimize an app by removing the service from the compiled app if it isn’t used.<\/p>\n\n\n\n
providedIn: Module
It’s also possible to specify that a service should be provided in a particular @NgModule. For example, if you don’t want a service to be available to applications unless they import a module you’ve created, you can specify that the service should be provided in the module<\/p>\n\n\n\n
import { Injectable } from '@angular\/core';\nimport { UserModule } from '.\/user.module';\n\n@Injectable({\n  providedIn: UserModule,\n})\nexport class UserService {\n}<\/code><\/pre>\n\n\n\n
This method is preferred because it enables Tree-shaking (Tree shaking<\/em><\/strong> is a step in a build process that removes unused code from a code base<\/em>) of the service if nothing injects it.<\/p>\n\n\n\n
If it’s not possible to specify in the service which module should provide it, you can also declare a provider for the service within the module:<\/p>\n\n\n\n
import { NgModule } from '@angular\/core';\nimport { UserService } from '.\/user.service';\n\n@NgModule({\n  providers: [UserService],\n})\nexport class UserModule {\n}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
Injectable decorator (@Injectable) marks a class as available to Injector for creation. The service itself is a class that the CLI generated and that’s decorated with @Injectable(). What exactly does providedIn do? Determines which injectors will provide the injectable, by either associating it with an @NgModule or other InjectorType, or by specifying that this injectable […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-197","post","type-post","status-publish","format-standard","hentry","category-angular"],"yoast_head":"\nWhat is Injectable decorator? - Santosh Kumar Shah<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/santosh-shah.com\/blog\/what-is-injectable-decorator\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What is Injectable decorator? - Santosh Kumar Shah\" \/>\n<meta property=\"og:description\" content=\"Injectable decorator (@Injectable) marks a class as available to Injector for creation. 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