Error: BrowserModule has already been loaded

Question

Error: BrowserModule has already been loaded

After updating my application to RC6, I encountered a persistent error message:

zone.js:484 Unhandled Promise rejection: BrowserModule has already been loaded. If you need access to common directives like NgIf and NgFor from a lazily loaded module...

My application is structured with lazy loading and consists of numerous lazily loaded modules. Strangely, everything worked smoothly in RC5.

The only noticeable change listed in the RC6 changelog is:

compiler: throw descriptive error messsage for invalid NgModule providers

However, since there were no issues in RC5, this change may not be the cause of the problem.

I am running out of solutions here, so any assistance would be greatly appreciated.

angular typescript

Answer 1

Answer №1

It appears that you may be utilizing either 'NoopAnimationsModule' or 'BrowserAnimationsModule', both of which already include 'BrowserModule' and allow for lazy loading of your module. To resolve this issue, simply replace the BrowserModule with 'NoopAnimationsModule' or 'BrowserAnimationsModule' in your 'app.module.ts' file.

import { Router } from '@angular/router';
import { AdminsModule } from './admins/admins.module';
import { NoopAnimationsModule } from '@angular/platform-browser/animations';
//import { BrowserModule } from '@angular/platform-browser';
import { NgModule,OnInit } from '@angular/core';
import { AppComponent } from './app.component'; 
@NgModule({
    declarations: [
        AppComponent,
    ],
    imports: [
    //BrowserModule,
    NoopAnimationsModule,
    FormsModule
],
    providers: [],
    bootstrap: [AppComponent]
})
export class AppModule {}

Answer 2

It appears that you may be utilizing either 'NoopAnimationsModule' or 'BrowserAnimationsModule', both of which already include 'BrowserModule' and allow for lazy loading of your module. To resolve this issue, simply replace the BrowserModule with 'NoopAnimationsModule' or 'BrowserAnimationsModule' in your 'app.module.ts' file.

import { Router } from '@angular/router';
import { AdminsModule } from './admins/admins.module';
import { NoopAnimationsModule } from '@angular/platform-browser/animations';
//import { BrowserModule } from '@angular/platform-browser';
import { NgModule,OnInit } from '@angular/core';
import { AppComponent } from './app.component'; 
@NgModule({
    declarations: [
        AppComponent,
    ],
    imports: [
    //BrowserModule,
    NoopAnimationsModule,
    FormsModule
],
    providers: [],
    bootstrap: [AppComponent]
})
export class AppModule {}

Answer 3

Answer №2

After some troubleshooting, I successfully resolved the issue I was facing. It turns out that a library I was using had accidentally imported the BrowserModule.

I'm leaving this question up just in case anyone else encounters a similar problem.

Answer 4

After some troubleshooting, I successfully resolved the issue I was facing. It turns out that a library I was using had accidentally imported the BrowserModule.

I'm leaving this question up just in case anyone else encounters a similar problem.

Answer 5

Answer №3

My experience involved utilizing BrowserAnimationsModule in individual components that were utilizing material design. To streamline this process, I decided to eliminate all references to "BrowserAnimationsModule" and instead included it in the main module.

The issue was that BrowserModule was being inadvertently imported with BrowserAnimationsModule, causing conflicts.

Answer 6

My experience involved utilizing BrowserAnimationsModule in individual components that were utilizing material design. To streamline this process, I decided to eliminate all references to "BrowserAnimationsModule" and instead included it in the main module.

The issue was that BrowserModule was being inadvertently imported with BrowserAnimationsModule, causing conflicts.

Answer 7

Answer №4

None of the solutions worked out in my case.

If you're still on the lookout for a fix and happen to be utilizing a SharedModule with lazy loading, my approach might just do the trick for you.

Resolution: Shift the following exports - BrowserModule, BrowserAnimationsModule, HttpModule, and HttpClientModule (originally from SharedModule) to imports within AppModule.

Here's an example:

Previous shared.module.ts:

@NgModule({
   declarations: [],
   imports: [],
   exports: [
      BrowserModule,
      BrowserAnimationsModule,
      HttpClientModule,
      // ...
   ]
})
export class SharedModule { }

Previous app.module.ts:

@NgModule({
   declarations: [
      AppComponent,
   ],
   imports: [
      SharedModule
   ],
   providers: [],
   exports: [],
   bootstrap: [AppComponent]
})
export class AppModule { }

New shared.module.ts:

@NgModule({
   declarations: [],
   imports: [],
   exports: [
      // ...
   ]
})
export class SharedModule { }

New app.module.ts:

@NgModule({
   declarations: [
      AppComponent,
   ],
   imports: [
      BrowserModule,
      BrowserAnimationsModule,
      HttpClientModule,
      SharedModule
   ],
   providers: [],
   exports: [],
   bootstrap: [AppComponent]
})
export class AppModule { }

Answer 8

None of the solutions worked out in my case.

If you're still on the lookout for a fix and happen to be utilizing a SharedModule with lazy loading, my approach might just do the trick for you.

Resolution: Shift the following exports - BrowserModule, BrowserAnimationsModule, HttpModule, and HttpClientModule (originally from SharedModule) to imports within AppModule.

Here's an example:

Previous shared.module.ts:

@NgModule({
   declarations: [],
   imports: [],
   exports: [
      BrowserModule,
      BrowserAnimationsModule,
      HttpClientModule,
      // ...
   ]
})
export class SharedModule { }

Previous app.module.ts:

@NgModule({
   declarations: [
      AppComponent,
   ],
   imports: [
      SharedModule
   ],
   providers: [],
   exports: [],
   bootstrap: [AppComponent]
})
export class AppModule { }

New shared.module.ts:

@NgModule({
   declarations: [],
   imports: [],
   exports: [
      // ...
   ]
})
export class SharedModule { }

New app.module.ts:

@NgModule({
   declarations: [
      AppComponent,
   ],
   imports: [
      BrowserModule,
      BrowserAnimationsModule,
      HttpClientModule,
      SharedModule
   ],
   providers: [],
   exports: [],
   bootstrap: [AppComponent]
})
export class AppModule { }

Answer 9

Answer №5

If you encounter the error message that seems pretty straightforward, it means that the module where lazy loading is being implemented should not import BrowserModule since it has already been imported before (typically in app.component). Remember to only import BrowserModule once, and have other modules import CommonModules instead.

Refer to the following code snippet for clarification:

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common'; //<-- Use this one 

import { SearchMovieMainComponent } from './search-movies-main.component';

@NgModule({
    imports: [
        CommonModule //<-- And use this one 
    ],
    declarations: [
        SearchMovieMainComponent
    ]
})
export class SearchMoviesMainModule {
}

Note: This answer is not originally mine. I was dealing with the same issue myself. In my case, I mistakenly had a CommonModule with the same name as the Angular one. It caused confusion because I didn't realize there was another CommonModule in Angular itself. I found a helpful resource on this topic in this blog and sharing the solution from there.

Answer 10

If you encounter the error message that seems pretty straightforward, it means that the module where lazy loading is being implemented should not import BrowserModule since it has already been imported before (typically in app.component). Remember to only import BrowserModule once, and have other modules import CommonModules instead.

Refer to the following code snippet for clarification:

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common'; //<-- Use this one 

import { SearchMovieMainComponent } from './search-movies-main.component';

@NgModule({
    imports: [
        CommonModule //<-- And use this one 
    ],
    declarations: [
        SearchMovieMainComponent
    ]
})
export class SearchMoviesMainModule {
}

Note: This answer is not originally mine. I was dealing with the same issue myself. In my case, I mistakenly had a CommonModule with the same name as the Angular one. It caused confusion because I didn't realize there was another CommonModule in Angular itself. I found a helpful resource on this topic in this blog and sharing the solution from there.

Answer 11

Answer №6

I've come across a similar issue where I have multiple lazy loading modules that all utilize the BrowserAnimationModule (which includes BrowserModule).

My solution involves firstly relocating the import of this module from the child module to the root module in app.module.ts.

//app.module.ts
@NgModule({
    declarations: [  ],
    imports: [    BrowserAnimationsModule,]

The second crucial step is to include the CommonModule in each child module as well.

//lazychild.module.ts
@NgModule({
  declarations: [  ],
  imports: [  CommonModule,]

Answer 12

I've come across a similar issue where I have multiple lazy loading modules that all utilize the BrowserAnimationModule (which includes BrowserModule).

My solution involves firstly relocating the import of this module from the child module to the root module in app.module.ts.

//app.module.ts
@NgModule({
    declarations: [  ],
    imports: [    BrowserAnimationsModule,]

The second crucial step is to include the CommonModule in each child module as well.

//lazychild.module.ts
@NgModule({
  declarations: [  ],
  imports: [  CommonModule,]

Answer 13

Answer №7

To resolve this issue, I implemented the following code snippet in my app.component.ts:

import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
  imports: [
..,
    BrowserAnimationsModule,
  ],

I made sure to remove any other instances of it from elsewhere in my project.

Answer 14

To resolve this issue, I implemented the following code snippet in my app.component.ts:

import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
  imports: [
..,
    BrowserAnimationsModule,
  ],

I made sure to remove any other instances of it from elsewhere in my project.

Answer 15

Answer №8

Eliminate all imports of "BrowserAnimationsModule" except for in AppModule.

Answer 16

Eliminate all imports of "BrowserAnimationsModule" except for in AppModule.

Answer 17

Answer №9

If you follow the instructions outlined on the Angular Issues Page, you have the opportunity to create a "Shared Module." This module allows you to consolidate all imports into one central location, which can then be easily imported into any new modules you create.

Answer 18

If you follow the instructions outlined on the Angular Issues Page, you have the opportunity to create a "Shared Module." This module allows you to consolidate all imports into one central location, which can then be easily imported into any new modules you create.

Answer 19

Answer №10

Resolved the Problem of BrowserModule Already Being loaded

In a recent project, I encountered an issue where I was importing one module directly into another child module without declaring it in the shared module. This oversight resulted in an error being thrown.

Answer 20

Resolved the Problem of BrowserModule Already Being loaded

In a recent project, I encountered an issue where I was importing one module directly into another child module without declaring it in the shared module. This oversight resulted in an error being thrown.

Error: BrowserModule has already been loaded

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

Answer №7

Answer №8

Answer №9

Answer №10

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