Initial compilation of Angular 2 project with lazy-loaded submodules fails to resolve submodules

Question

Initial compilation of Angular 2 project with lazy-loaded submodules fails to resolve submodules

I'm working on an Angular 2 project (angular cli 1.3.2) that is structured with multiple modules and lazy loading. In my main module, I have the following code to load sub-modules within my router:

{
    path: 'module2',
    loadChildren: 'modules/module2/module2.module.ts#Module2Module',
    canActivate: [Guard]
},

However, when I run ng serve, I encounter the following error message:

ERROR in Could not resolve "modules/module2/module2.module.ts" from "<..>/app/app.module.ts".

Oddly enough, whenever I save any file in the project (triggering a re-build), the build is successful and both modules function correctly without needing to actually make any changes. Has anyone experienced this issue before or know of a way to resolve it?

Any help would be greatly appreciated.

angular typescript

Answer 1

Answer №1

If you're looking to optimize your website's loading time, implementing lazy-loading could be a beneficial solution.

To configure lazy-loading in your Angular application, make sure to include the necessary entry in your app-routing.module.ts file. Here is an example of how it should look:

{
    path: 'module2',
    loadChildren: './modules/module2/module2.module#Module2Module',
    canActivate: [AuthGuard]
}

It's important to note that there should not be a file extension included in the module's path for lazy-loading to work efficiently.

Answer 2

If you're looking to optimize your website's loading time, implementing lazy-loading could be a beneficial solution.

To configure lazy-loading in your Angular application, make sure to include the necessary entry in your app-routing.module.ts file. Here is an example of how it should look:

{
    path: 'module2',
    loadChildren: './modules/module2/module2.module#Module2Module',
    canActivate: [AuthGuard]
}

It's important to note that there should not be a file extension included in the module's path for lazy-loading to work efficiently.

Answer 3

Answer №2

After troubleshooting, I found a solution by removing Lazy Loading:

To fix the issue, make sure to include both imports in the app.module.ts file for app.router.ts and

modules/module2/module2.module.ts

. Also, ensure that Module2 is placed before the main App router within the '@NgModule' 'includes' section:

import { RouterModule, Router } from '@angular/router';
import { NgModule } from '@angular/core';

import { appRoutes } from './app.router';
import { Module2 } from './modules/module2/module2.module';

// Other imports

@NgModule({
  declarations: [..],
  imports: [
    ..,
    Module2,
    RouterModule.forRoot(appRoutes)
  ],
  providers: [..],
  entryComponents: [..],
  bootstrap: [..]
})
export class AppModule {  }

The error experienced was caused by the incorrect order of imports, as outlined in Milestone 3 of the Angular Routing Guide

I appreciate the helpful suggestions provided by fellow contributors!

Answer 4

After troubleshooting, I found a solution by removing Lazy Loading:

To fix the issue, make sure to include both imports in the app.module.ts file for app.router.ts and

modules/module2/module2.module.ts

. Also, ensure that Module2 is placed before the main App router within the '@NgModule' 'includes' section:

import { RouterModule, Router } from '@angular/router';
import { NgModule } from '@angular/core';

import { appRoutes } from './app.router';
import { Module2 } from './modules/module2/module2.module';

// Other imports

@NgModule({
  declarations: [..],
  imports: [
    ..,
    Module2,
    RouterModule.forRoot(appRoutes)
  ],
  providers: [..],
  entryComponents: [..],
  bootstrap: [..]
})
export class AppModule {  }

The error experienced was caused by the incorrect order of imports, as outlined in Milestone 3 of the Angular Routing Guide

I appreciate the helpful suggestions provided by fellow contributors!

Answer 5

Answer №3

It seems like there may be a better solution to your issue. While your app is currently compiling, the lack of lazy loading could lead to slow initial load times as your app grows in size.

Lazy loading allows modules to be loaded separately through individual JavaScript requests rather than being compiled into one large file. This customizable feature can greatly improve performance for larger production apps, allowing modules to be loaded either aggressively or as the user navigates through the site.

Based on suggestions from @AndreaM16, it appears that there might be an error in your routing configuration, specifically with the naming convention for "Module2". It should be referenced simply as "Module2" instead of "Module2Module". You can try adjusting the code snippet below:

{
    path: 'module2',
    loadChildren: './modules/module2/module2.module#Module2Module',
    canActivate: [Guard]
},

If this adjustment does not resolve the issue, providing insight into your file structure and possibly sharing the Module2 code could be beneficial.

Additionally, remember to remove references to Module2 in your AppModule, including the import statement { Module2 } from './modules/module2/module2.module'. By using a magic string for lazy loading, webpack will not bundle the module code into the initial JavaScript package, ensuring it is loaded only when needed.

Answer 6

It seems like there may be a better solution to your issue. While your app is currently compiling, the lack of lazy loading could lead to slow initial load times as your app grows in size.

Lazy loading allows modules to be loaded separately through individual JavaScript requests rather than being compiled into one large file. This customizable feature can greatly improve performance for larger production apps, allowing modules to be loaded either aggressively or as the user navigates through the site.

Based on suggestions from @AndreaM16, it appears that there might be an error in your routing configuration, specifically with the naming convention for "Module2". It should be referenced simply as "Module2" instead of "Module2Module". You can try adjusting the code snippet below:

{
    path: 'module2',
    loadChildren: './modules/module2/module2.module#Module2Module',
    canActivate: [Guard]
},

If this adjustment does not resolve the issue, providing insight into your file structure and possibly sharing the Module2 code could be beneficial.

Additionally, remember to remove references to Module2 in your AppModule, including the import statement { Module2 } from './modules/module2/module2.module'. By using a magic string for lazy loading, webpack will not bundle the module code into the initial JavaScript package, ensuring it is loaded only when needed.

Initial compilation of Angular 2 project with lazy-loaded submodules fails to resolve submodules

Answer №1

Answer №2

Answer №3

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