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Angular: Understanding Modules and Services – Michele Stieven – Medium

Angular: Understanding Modules and Services

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  • The same applies for directives and pipes.— It must import CommonModule instead of BrowserModuleWhile BrowserModule must be imported in AppModule (it’s required in order to run the app in the browser), this module must not be imported elsewhere: instead, we must import CommonModule, which contains Angular’s common directives, such as…
  • In a Shared Module, of course!Shared ModulesA shared module is the perfect place to declare components in order to make them reusable: this way, you won’t re-import the same components in every module, you’ll just import the shared module.Notice the “exports” property which makes components, directives, pipes and even other…
  • Well, you might think that we already declare our global services in CoreModule, and it’s true, but what if the components declared in the shared module needed some services?
  • It has a second method forChild just because you need to provide an array of routes, but if you don’t need to pass anything to the shared module, it’s useless to have a second method, just import the module.Actually, this forRoot thing is a convention adopted by a lot of…
  • For that, in our CoreModule folder, use can create an index.ts file and re-export all of our services: now we can import directly from situationThis is more-or-less how we’re supposed to structure our modules and folders:From there, you can obviously extend your application with different shared modules (perhaps a UIKitModule,…

I found that most developers struggle with this questions because they don’t have a clear vision of how Angular Modules work and how important they are for the Dependency Injection mechanism. In…

Angular: Understanding Modules and Services…and using them to better organize applications!Here you are! You are starting to feel comfortable with this framework, and all of the sudden…Where should I put my services? Am I importing them in the right way? Are my modules well-organized and ready to scale? Is this component in the right place?How do I even name this folder?I found that most developers struggle with this questions because they don’t have a clear vision of how Angular Modules work and how important they are for the Dependency Injection mechanism.In this article we try to lay the foundation for all of your next projects, nothing less! 😃Feature ModulesIn Angular, every module which is not the AppModule is technically a Feature Module, and it has the following caveats:— It must declare all the components, directives and pipe it needsWe’ll talk about module-scoping soon, but for now it’s important to understand that is not enough to declare a component once in the declarations array of AppModule: in order to use a component in a module, it must be declared in that specific module. The same applies for directives and pipes.— It must import CommonModule instead of BrowserModuleWhile BrowserModule must be imported in AppModule (it’s required in order to run the app in the browser), this module must not be imported elsewhere: instead, we must import CommonModule, which contains Angular’s common directives, such as ngIf, ngFor, ngClass, etc… BrowserModule also re-exports CommonModule, so that you can use this directives in AppModule too.— It doesn’t…

Angular: Understanding Modules and Services – Michele Stieven – Medium

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