2019年9月23日 · Injectable() in the service specifies that this service can be injected/used in other components. In short if service has injectable decorator, other components can use that service by creating reference of service class in the constructor.

In the @Injectable() decorator for the service itself. In the @NgModule() decorator for an NgModule. In the @Component() decorator for a component. The @Injectable() decorator has the providedIn metadata option, where you can specify the provider of the decorated service class with the root injector, or with the injector for a specific NgModule.

2016年5月19日 · The @Injectable decorator aims to actually set some metadata about which dependencies to inject into the constructor of the associated class. It's a class decorator that doesn't require parameters. It's a class decorator that doesn't require parameters.

2020年9月11日 · @Injectable() really registers it for things to be injected INTO the service. you can safely inject things that are not marked @Injectable() so long as they're provided. point 3 isn't entirely true, services are specifically NOT singletons in angular unless you want them to be, you can provide at module or root level and still provide at ...

2016年12月23日 · The first paragraph sounds like the previous @Injectable documentation, while the second paragraph got it right. Just keep in mind that it is just recommended that we always add the @Injectable decorator on all our services as we may later decide that we need to add dependency parameters, but forget the add the @Injectable when we do so.

2016年4月8日 · A component is injectable by default @Component() (or @Directive()) includes @Injectable(). Don't expect to get a specific instance of a component injected. This works for example with constructor(@Host() private parentComponent) where DI lookup is limited to parent injectors up to the injector of the host element.

2021年8月18日 · I am using get_it in my flutter project for the dependency injection. Now I am trying to do it with injectable to replace my handwritten dependency file with annotations. I have the special case, that I have a class which is generic and must be injected 3 times with a different value of T. class TestBloc<T> { ...

2020年10月14日 · import { Injectable } from '@nestjs/common'; const userMock = [{ account: 'dung', password: '12345678' }]; @Injectable() export class UserService { getUser() { return userMock } } I not really understand @Injectable in NestJS. Some tutorial tell @Injectable tell the @Controller know it's an install and can use it as a Dependency Injection. But ...

2018年6月14日 · import { Injectable } from '@angular/core'; import { UserModule } from './user.module'; @Injectable({ providedIn: UserModule, }) export class UserService { } This method is preferred because it enables Tree-shaking ( Tree shaking is a step in a build process that removes unused code from a code base ) of the service if nothing injects it.

2022年2月1日 · I've been spinning my wheels for hours on the simple question of how to inject http.Client into a flutter class when using injectable. They reference doing this in a module (as suggested in this post ), but I can't figure that out either.