How to declare AppComponent in two different modules

user_3492262 0
Viewed 232

I am running Angular 7 project which contains two different applications:

  1. BasicTools
  2. AdvancedTools

BasicTools project points to basic-main.ts and AdvancedTools project points to advanced-main.ts. From basic-main.ts file, BasicAppModule is bootstraped and from advanced-main.ts AdvancedAppModule is bootstraped.

I have common AppComponent which is being used in both BasicAppModule and AdvancedAppModule but while building the application, I am getting error as AppComponent is declared as part of two module.

I tried exporting AppComponent in basic-app.module.ts and also removed the declaration of AppComponent from advanced-app.module.ts but getting error as: AppComponent should be declared as part of ngModule.

Is there any way to fix this as I need AppComponent in both the modules.??

Below is my angular.json file:

{
  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
  "version": 1,
  "newProjectRoot": "projects",
  "projects": {
    "BasicTools": {
      "root": "",
      "sourceRoot": "Client",
      "projectType": "application",
      "prefix": "app",
      "schematics": {
        "@schematics/angular:component": {
          "styleext": "scss"
        }
      },
      "architect": {
        "build": {
          "builder": "@angular-devkit/build-angular:browser",
          "options": {
            "outputPath": "wwwroot",
            "index": "Client/index.html",
            "main": "Client/app/basic/basic-main.ts",
            "polyfills": "Client/polyfills.ts",
            "tsConfig": "Client/tsconfig.app.json",
            "assets": [
              "Client/assets"
            ],
            "styles": [
              "Client/styles.scss"
            ],
            "scripts": []
          },
          "configurations": {
            "production": {
              "fileReplacements": [
                {
                  "replace": "Client/environments/environment.ts",
                  "with": "Client/environments/environment.prod.ts"
                }
              ],
              "optimization": true,
              "outputHashing": "none",
              "sourceMap": false,
              "extractCss": true,
              "namedChunks": false,
              "aot": true,
              "extractLicenses": true,
              "vendorChunk": false,
              "buildOptimizer": true
            }
          }
        },
        "serve": {
          "builder": "@angular-devkit/build-angular:dev-server",
          "options": {
            "browserTarget": "BasicTools:build"
          },
          "configurations": {
            "production": {
              "browserTarget": "BasicTools:build:production"
            }
          }
        }
    },
    "AdvancedTools": {
      "root": "",
      "sourceRoot": "Client",
      "projectType": "application",
      "prefix": "app",
      "schematics": {
        "@schematics/angular:component": {
          "styleext": "scss"
        }
      },
      "architect": {
        "build": {
          "builder": "@angular-devkit/build-angular:browser",
          "options": {
            "outputPath": "wwwroot",
            "index": "Client/index.html",
            "main": "Client/app/advanced/advanced-main.ts",
            "polyfills": "Client/polyfills.ts",
            "tsConfig": "Client/tsconfig.app.json",
            "assets": [
              "Client/assets"
            ],
            "styles": [
              "Client/styles.scss"
            ],
            "scripts": []
          },
          "configurations": {
            "production": {
              "fileReplacements": [
                {
                  "replace": "Client/environments/environment.ts",
                  "with": "Client/environments/environment.prod.ts"
                }
              ],
              "optimization": true,
              "outputHashing": "none",
              "sourceMap": false,
              "extractCss": true,
              "namedChunks": false,
              "aot": true,
              "extractLicenses": true,
              "vendorChunk": false,
              "buildOptimizer": true
            }
          }
        },
        "serve": {
          "builder": "@angular-devkit/build-angular:dev-server",
          "options": {
            "browserTarget": "AdvancedTools:build"
          },
          "configurations": {
            "production": {
              "browserTarget": "AdvancedTools:build:production"
            }
          }
        }
    },

advanced-main.ts

import { enableProdMode } from '@angular/core';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';

import { environment } from '../../environments/environment';
import { AdvancedAppModule } from '../advanced-app.module';

if (environment.production) {
  enableProdMode();
}

platformBrowserDynamic().bootstrapModule(AdvancedAppModule);

basic-main.ts

import { enableProdMode } from '@angular/core';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';

import { environment } from '../../environments/environment';
import { BasicAppModule } from '../basic-app.module';

if (environment.production) {
  enableProdMode();
}

platformBrowserDynamic().bootstrapModule(BasicAppModule);

advanced-app.module.ts

@NgModule({
  declarations: [ AppComponent ],
  imports: [
    BrowserModule,
    CoreModule,
    SharedModule,
    BasicModule,
    AdvancedModule,
    applicationRoutingInformation
  ],
  providers: [
    { provide: LocationStrategy, useClass: MiPathLocationStrategy }
  ],
  bootstrap: [AppComponent]
})
export class AdvancedAppModule { }

basic-app.module.ts

@NgModule({
  declarations: [ AppComponent ],
  imports: [
    BrowserModule,
    BasicModule,
    CoreModule,
    SharedModule,
    applicationRoutingInformation
  ],
  providers: [
    { provide: LocationStrategy, useClass: MiPathLocationStrategy }
  ],
  bootstrap: [AppComponent]
})
export class BasicAppModule { }
angular typescript
2 Answers

Create AppModule that exports AppComponent and import it in both of your root module configurations:

app.module.ts

@NgModule({
  declarations: [AppComponent],
  exports: [AppComponent]
})
export AppModule {}

basic-app.module.ts

@NgModule({
  imports: [AppModule, ...],
  bootstrap: [AppComponent],
  ...
})
export class BasicAppModule{}

advanced-app.module.ts

@NgModule({
  imports: [AppModule, ...],
  bootstrap: [AppComponent],
  ...
})
export class AdvancedAppModule {}

Even further if you have some common dependencies for you AppComponent shared between those two entry modules you can add providers for them in AppModule configuration.

user_27898840

We can't declare same component in two different and in this case we create a common module and imports it to both of modules.

common-module.ts

import { NgModule } from '@angular/core';
//import your component


@NgModule({
  declarations:[yourComponent],
  exports: [yourComponent]
})

export class CommonModule { }
user_47817870
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