Exploring the power of Angular 10 components

Angular version 10 has left me feeling bewildered. Let's explore a few scenarios:

Scenario 1: If I create AComponent.ts/html/css without an A.module.ts, should I declare and export it in app.module.ts? Can another module 'B' use the 'A' selector or does 'B' need to import app.module.ts?

Scenario 2: Would it be better to create an A.module.ts that declares and exports AComponent, requiring B.module.ts to import A.Module? This approach could allow B.html to...something.

Scenario 3: Alternatively, could I directly reference AComponent from BComponent.ts with an Import AComponent statement, even if AComponent is not declared in any module? This would enable B.html to...something else.

Could someone offer some clarity on these scenarios? My Angular 10 application is behaving strangely, and I feel lost. Your guidance would be greatly appreciated.

Warm regards, Yogi

angulartypescriptmodule

Answer №1

Case 1:

ComponentModule

  • Declares/Exports: ComponentX

ModuleY

  • Declares: ComponentY

In order for ComponentY to utilize ComponentX, it must be accessible from ModuleY. This can be achieved by declaring it in ModuleY instead of ComponentModule as follows:

ComponentModule

  • Imports: ModuleY (If ComponentModule requires access to ComponentX/ComponentY) ModuleY
  • Declares: ComponentX/ComponentY

Alternatively, you can import ComponentModule into ModuleY, but this is not recommended as ComponentModule serves as the main module of the application and should not be imported into other modules.

Case 2:

ModuleA

  • Declares/Exports: ComponentX

ModuleB

  • Declares: ComponentY
  • Imports: ModuleA

This approach allows ComponentY to access ComponentX because ModuleB imports ModuleA, gaining access to all its exported components. This is a better solution compared to Case 1.

Case 3:

This scenario is unclear. Further explanation would be appreciated to provide better assistance.

General Principle

Any component declared in ModuleA can access all components declared within ModuleA or exported from other imported modules in ModuleA.

It is recommended to create a SharedModule where reusable components are declared and import this module wherever needed. For more information, refer to the documentation at https://angular.io/guide/sharing-ngmodules

Note that services function differently.

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