Angular Circular Module import

Question

I have two Modules with components which use each other. So I have to import "word" in "test" and "test" in "word" --> throw an error... How can I do ?

Module "test":

    @NgModule({
      declarations: [
        AppTest1Component,
        AppTest2Component,
      ],
      imports: [
        AppWordModule,
      ],
      exports: [
        AppTest1Component,
        AppTest2Component,
      ],
    })
    export class AppTestModule {
    }

Module "word":

    @NgModule({
      declarations: [
        AppWordComponent,
      ],
      imports: [
        AppTestModule,
      ],
      exports: [
        AppWordComponent,
      ],
    })
    export class AppWordModule {
    }

I import each other because of the template. The template of test1.component.ts calls word.component.ts et the template of word.component.ts calls test1.component.ts.

test1.html

    <div class="app-word"></div>

word.html

    <div class="app-test1"></div>

I tried to use a SharedModule but I don't achieve it...

Answer 1

Maybe you can use content projection with ng-content directive to compose nested components, but it depends how you need to compose them, in example

// ComposeModule

    @NgModule({
      imports: [
        CommonModule,
        AppWordModule,
        AppTestModule
      ],
      declarations: [CompositionComponent],
      exports: [CompositionComponent]
    })
    export class ComposeModule { }

// composition.component.html

    <app-word>
      <app-child-one header>
        <app-word body>
        </app-word>
      </app-child-one>
      
      <app-child-two body>
        <app-word body>
        </app-word>
      </app-child-two>
    </app-word>

// AppWordModule

    @NgModule({
      imports: [
        CommonModule
      ],
      declarations: [ WordComponent ],
      exports: [ WordComponent ]
    })
    export class AppWordModule { }

// word.component.html

    <div class="header">
      <h2>app-word:header</h2>
      <ng-content select="[header]"></ng-content>
    </div>
    <div class="body">
      <h2>app-word:body</h2>
      <ng-content select="[body]"></ng-content>
    </div>

// AppTestModule

    const COMPONENTS = [
      ChildOneComponent,
      ChildTwoComponent
    ]
    
    @NgModule({
      imports: [
        CommonModule
      ],
      declarations: [
        ...COMPONENTS
      ],
      exports: [
        ...COMPONENTS
      ]
    })
    export class AppTestModule { }

// child-one.component.html

    <div class="header">
      <h2>app-child-one:header</h2>
      <ng-content select="[header]"></ng-content>
    </div>
    <div class="body">
      <h2>app-child-one:body</h2>
      <ng-content select="[body]"></ng-content>
    </div>

// child-two.component.html

    <div class="header">
      <h2>app-child-two:header</h2>
      <ng-content select="[header]"></ng-content>
    </div>
    <div class="body">
      <h2>app-child-two:body</h2>
      <ng-content select="[body]"></ng-content>
    </div>

Answer 2

You need to solve the problem architecturally.

You can either create a module that has both functionalities ... since they seem so closely coupled, it would be my first preference, or else you can break up the modules even more so that the features of one module that are required by the other are in their own module.