Having difficulties generating a production build in Ionic using the (--prod) flag

Question

Having difficulties generating a production build in Ionic using the (--prod) flag

I have been working on an almost complete Ionic app. Testing it has been smooth using the regular ionic build method and then creating an APK with Capacitor for testing purposes. However, things take a turn when I try to optimize my code using the --prod flag, as it throws a multitude of template errors that hinder the compilation process. Interestingly, these errors do not surface during regular builds.

Here are the steps to reproduce:

Start with a functional version of the app (both for Android and web).
Attempt to build a production version with 'ionic build --prod'.

Output:

Error: src/app/app.component.html:10:5 - error NG8001: 'ion-menu' is not a known element:

If 'ion-menu' is an Angular component, then verify that it is part of this module.

If 'ion-menu' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message.

https://i.sstatic.net/SH3Dv.png

This is a snippet from my output, specifically highlighting issues related to templates in the application.

Given below is the structure of my main module:

@NgModule({
  declarations: [
    AppComponent,
  ],
  imports: [
    BrowserModule,
    IonicModule.forRoot(),
    AppRoutingModule,
    ComponentsModule,
    FormsModule,
  ],
  providers: [
    ParseHandlerService,
    StatusBar,
    Geolocation,
    SplashScreen,
    AppStateService,
    SpinnerService,
    IconGetterService,
    ReactiveChannel,
    ImageResizer
  ],
  bootstrap: [AppComponent]
})

Information about my Ionic setup:

`Ionic:

Ionic CLI : 6.11.1 (C:\Users\zerok\AppData\Roaming\npm\node_modules@ionic\cli) Ionic Framework : @ionic/angular 5.5.4 @angular-devkit/build-angular : 0.1101.4 @angular-devkit/schematics : 9.1.9 @angular/cli : 11.1.4 @ionic/angular-toolkit : 2.2.0

Capacitor:

Capacitor CLI : 2.4.6 @capacitor/core : 2.4.6

Utility:

cordova-res : not installed native-run : not installed

System:

NodeJS : v15.7.0 (C:\Program Files\nodejs\node.exe) npm : 6.14.11 OS : Windows 10`

EDIT: Sharing my app.component.html file upon request

<div class="waiting" *ngIf="!appLoaded">
  Loading data...
</div>
<ion-app *ngIf="appLoaded">
  <ion-split-pane contentId="main">
    <ion-menu side="start" menuId="first" contentId="main" [disabled]="userTraining" [maxEdgeStart]="15">
      <ion-header>
        <ion-toolbar>
          <ion-title>My App</ion-title>
        </ion-toolbar>
      </ion-header>
      <ion-content>
        <ion-list *ngIf="!userRef">
          <ion-item *ngFor="let p of appPages" [routerDirection]="'root'" [routerLink]="[p.url]"
              [queryParams]="p?.parameters ? p.parameters : null">
              <ion-icon slot="start" [name]="p.icon" [style.color]="'#00c1ff'"></ion-icon>
              <ion-label>
                {{p.title}}
              </ion-label>
            </ion-item>
        </ion-list>
        <ion-list *ngIf="userRef">
          <ion-menu-toggle auto-hide="false">
            ...
          </ion-menu-toggle>
        </ion-list>
      </ion-content>
    </ion-menu>
    ...
  </ion-split-pane>
</ion-app>

UPDATE 2: Despite attempting to create a new project via ionic start and meticulously transferring files and dependencies, including those in the package.json, I continued to encounter the same errors while running ionic build --prod. The persistent nature of these errors within 'app.component.html' hints at an underlying issue that eludes resolution.

angular typescript ionic-framework

Answer 1

Answer №1

Ensure to include IonicModule in all your modules that utilize Ionic components, as well as in your app.module.ts file.

@NgModule({
...
imports: [
...
IonicModule.forRoot(),
...],
...})

export class CustomizedModule {}

Answer 2

Ensure to include IonicModule in all your modules that utilize Ionic components, as well as in your app.module.ts file.

@NgModule({
...
imports: [
...
IonicModule.forRoot(),
...],
...})

export class CustomizedModule {}

Answer 3

Answer №2

Did you remember to include the RouterModule in your AppRoutingModule?

@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule] // <-- make sure this is included
})
export class AppRoutingModule { }

When using limitTo in `app.component.html', don't forget to declare it.

@NgModule({
  imports: [
    AppRoutingModule,
    // and others
  ],
  declarations: [ LimitToPipe ], // <-- add it here
})
export class AppModule{ }

Answer 4

Did you remember to include the RouterModule in your AppRoutingModule?

@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule] // <-- make sure this is included
})
export class AppRoutingModule { }

When using limitTo in `app.component.html', don't forget to declare it.

@NgModule({
  imports: [
    AppRoutingModule,
    // and others
  ],
  declarations: [ LimitToPipe ], // <-- add it here
})
export class AppModule{ }

Answer 5

Answer №3

Finally, after a long struggle, I was able to resolve this issue!

If you are facing the same problem, consider moving your main app component from app.component.ts to a different module. You can place it in a shared components module, for instance.

In summary, I made changes to my app.module.ts as follows:

@NgModule({
  declarations: [
    AppComponent,
  ],
  imports: [
    BrowserModule,
    IonicModule.forRoot(),
    AppRoutingModule,
    ComponentsModule,
    FormsModule,
  //  AssistanceCheckerModule,
    // ServiceWorkerModule.register('/ngsw-worker.js', { enabled: environment.production })
  ],
  providers: [
    ParseHandlerService,
    StatusBar,
    Geolocation,
    SplashScreen,
    AppStateService,
    SpinnerService,
    IconGetterService,
    ReactiveChannel,
 //   DatePicker,
    ImageResizer
  ],
  bootstrap: [AppComponent]
})
export class AppModule { }

... and transformed it into this:

@NgModule({
  imports: [
    BrowserModule,
    IonicModule.forRoot(),
    AppRoutingModule,
    ComponentsModule,
    FormsModule,
  //  AssistanceCheckerModule,
    // ServiceWorkerModule.register('/ngsw-worker.js', { enabled: environment.production })
  ],
  providers: [
    ParseHandlerService,
    StatusBar,
    Geolocation,
    SplashScreen,
    AppStateService,
    SpinnerService,
    IconGetterService,
    ReactiveChannel,
 //   DatePicker,
    ImageResizer
  ],
  bootstrap: [AppComponent]
})
export class AppModule { }

Now, the main component AppComponent is included in both the declare and exports properties of the ComponentsModule, allowing other modules that import this module to use the component.

This is how the ComponentsModule structure looks like:

@NgModule({
      declarations: [
            AppComponent,
            // more components
      ],
      imports: [
            IonicModule,
            CommonModule,
            FormsModule,
            RouterModule,
            CommentsModule
      ],
      exports: [
            AppComponent,
            // more components
      ],
})
export class ComponentsModule { }

As a result, when performing a production build using ionic build --prod, the strange errors that used to occur have been eliminated.

Answer 6

Finally, after a long struggle, I was able to resolve this issue!

If you are facing the same problem, consider moving your main app component from app.component.ts to a different module. You can place it in a shared components module, for instance.

In summary, I made changes to my app.module.ts as follows:

@NgModule({
  declarations: [
    AppComponent,
  ],
  imports: [
    BrowserModule,
    IonicModule.forRoot(),
    AppRoutingModule,
    ComponentsModule,
    FormsModule,
  //  AssistanceCheckerModule,
    // ServiceWorkerModule.register('/ngsw-worker.js', { enabled: environment.production })
  ],
  providers: [
    ParseHandlerService,
    StatusBar,
    Geolocation,
    SplashScreen,
    AppStateService,
    SpinnerService,
    IconGetterService,
    ReactiveChannel,
 //   DatePicker,
    ImageResizer
  ],
  bootstrap: [AppComponent]
})
export class AppModule { }

... and transformed it into this:

@NgModule({
  imports: [
    BrowserModule,
    IonicModule.forRoot(),
    AppRoutingModule,
    ComponentsModule,
    FormsModule,
  //  AssistanceCheckerModule,
    // ServiceWorkerModule.register('/ngsw-worker.js', { enabled: environment.production })
  ],
  providers: [
    ParseHandlerService,
    StatusBar,
    Geolocation,
    SplashScreen,
    AppStateService,
    SpinnerService,
    IconGetterService,
    ReactiveChannel,
 //   DatePicker,
    ImageResizer
  ],
  bootstrap: [AppComponent]
})
export class AppModule { }

Now, the main component AppComponent is included in both the declare and exports properties of the ComponentsModule, allowing other modules that import this module to use the component.

This is how the ComponentsModule structure looks like:

@NgModule({
      declarations: [
            AppComponent,
            // more components
      ],
      imports: [
            IonicModule,
            CommonModule,
            FormsModule,
            RouterModule,
            CommentsModule
      ],
      exports: [
            AppComponent,
            // more components
      ],
})
export class ComponentsModule { }

As a result, when performing a production build using ionic build --prod, the strange errors that used to occur have been eliminated.

Answer 7

Answer №4

My experience mirrored yours, as I encountered the same problem of missing path entries in app-routing.modules.ts. Interestingly, no errors were raised during debugging, but upon building with the --prod flag, an 'ion-content' is not a known element issue surfaced. After rectifying all the omitted files, the issue resolved itself.

Answer 8

My experience mirrored yours, as I encountered the same problem of missing path entries in app-routing.modules.ts. Interestingly, no errors were raised during debugging, but upon building with the --prod flag, an 'ion-content' is not a known element issue surfaced. After rectifying all the omitted files, the issue resolved itself.

Answer 9

Answer №5

If someone encounters a similar issue with modals, I faced a related problem as well. It was functioning properly in the testing builds, but when adding the --prod flag, it stopped working. Just ensure that the modal child modules are properly imported into the parent module that is utilizing them. For more details, refer to this link: https://github.com/ionic-team/ionic-cli/issues/4657#issuecomment-848615468

Answer 10

If someone encounters a similar issue with modals, I faced a related problem as well. It was functioning properly in the testing builds, but when adding the --prod flag, it stopped working. Just ensure that the modal child modules are properly imported into the parent module that is utilizing them. For more details, refer to this link: https://github.com/ionic-team/ionic-cli/issues/4657#issuecomment-848615468

Having difficulties generating a production build in Ionic using the (--prod) flag

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

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