Troubles in app.module arise post-transition from Angular 15 to Angular 16

While attempting to upgrade my Angular application from version 15 to 16, I ran into a multitude of errors within my app.module. Despite trying various troubleshooting steps, such as checking module imports and utilizing ng update, the errors persist. It appears that the issues stem from module imports and package versions. Has anyone else encountered similar challenges during their migration from Angular 15 to 16? What steps do you recommend to resolve these errors specifically within the app.module? Any advice or guidance on dealing with these migration errors would be highly valued. This question provides a detailed overview of the problem, facilitating the community in offering relevant assistance.

The encountered errors:

Error: src/app/app.module.ts:49:12 - error NG6002: This import contains errors, which may affect components that depend on this NgModule.

 49   imports: [
               ~
 50     BrowserModule,
    ~~~~~~~~~~~~~~~~~~
...
 71     NgIdleKeepaliveModule.forRoot()
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 72   ],
    ~~~


Error: src/app/core/rebarauth/rebar.auth.module.ts:118:13 - error NG6002: 'MsalModule' does not appear to be an NgModule class.

118   imports: [MsalModule],
                ~~~~~~~~~~

  node_modules/@azure/msal-angular/msal.module.d.ts:5:22
    5 export declare class MsalModule {
                           ~~~~~~~~~~
    This likely means that the library (@azure/msal-angular) which declares MsalModule is not compatible with Angular Ivy. Check if a newer version of the library is available, and update if so. Also consider checking with the library's authors to see if the library is expected to be compatible with Ivy.


Error: src/app/pages/admin/admin.module.ts:85:5 - error NG6002: 'NgxDropzoneModule' does not appear to be an NgModule class.

85     NgxDropzoneModule,
       ~~~~~~~~~~~~~~~~~

  node_modules/ngx-dropzone/lib/ngx-dropzone.module.d.ts:1:22
    1 export declare class NgxDropzoneModule {
                           ~~~~~~~~~~~~~~~~~
    This likely means that the library (ngx-dropzone) which declares NgxDropzoneModule is not compatible with Angular Ivy. Check if a newer version of the library is available, and update if so. Also consider checking with the library's authors to see if the library is expected to be compatible with Ivy.


Error: src/app/pages/admin/admin.module.ts:88:5 - error NG6002: 'LMarkdownEditorModule' does not appear to be an NgModule class.

88     LMarkdownEditorModule,
       ~~~~~~~~~~~~~~~~~~~~~

  node_modules/ngx-markdown-editor/public_api.d.ts:4:22
    4 export declare class LMarkdownEditorModule {
                           ~~~~~~~~~~~~~~~~~~~~~
    This likely means that the library (ngx-markdown-editor) which declares LMarkdownEditorModule is not compatible with Angular Ivy. Check if a newer version of the library is available, and update if so. Also consider checking with the library's authors to see if the library is expected to be compatible with Ivy.
  1. Updated all dependencies: When I run ng update, I don't get any pending updates. 2.Cleared Cache: Deleted the node_modules folder and package_lock.json file, and did a clean npm install.

Answer №1

The issue lies in the error notifications you've been receiving. Angular 16 no longer supports the Angular Compatibility Compiler (ngcc), causing a disruption in compatibility with certain outdated libraries such as ngx-dropzone. Due to this, the ngx-dropzone library has been marked as deprecated.

To transition to Angular 16, you'll need to substitute ngx-dropzone with a different library, such as @ngx-dropzone/cdk.

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