Developing a Angular 2.3 custom library with advanced dependency injection techniques

I am currently facing a challenge in integrating a custom service from a Yeoman-created library into my existing Ionic2 project. The index.ts file of the library, which will be installed as an npm module, is structured as follows:

@NgModule({
    imports: [
        CommonModule
    ],
    declarations: [
        SampleComponent,
        SampleDirective,
    ],
    exports: [
        SampleComponent,
        SampleDirective,
        SamplePipe
    ]
})
export default class SampleModule {
    static forRoot(): ModuleWithProviders {
        return {
            ngModule: SampleModule,
            providers: [SampleService, SettingsSVC]
         };
    }
}

When attempting to inject SettingsSVC and the module.ts into my Ionic2 App by adding it to the imports section of the app.module, I encounter the following error:

Unexpected value 'SettingsSVC' imported by the module 'AppModule'

If I do not include it, a console error "provider not found" occurs.

Although the type (class irrespective of the @Injectable) is recognized and linked, I find that adding the same class directly to my Ionic2 App and its providers section in the module allows for successful injection.

Any advice on how to resolve this issue?

Answer №1

Give this a shot:

@NgModule({
  imports: [SampleModule.forRoot()],
  declarations: [],
  providers: []
})
export class YourAppModule {}

Answer №2

If you encounter an error message that says "unexpected value," it typically indicates that the item you are trying to import was not imported successfully.

This could be due to one of the following reasons:

1- The path to SettingsSVC is incorrect

2- The name of SettingsSVC is incorrect

3- The path is correct, but SettingsSVC is not properly exported

To verify whether SettingsSVC has been successfully imported, add a console.log statement after the import and log it out:

import {SettingsSVC} from 'the/path/'

console.log('SettingsSVC',SettingsSVC);

If the log displays "undefined," then it is likely one of the issues mentioned above (or something similar).

Additionally, I want to clarify if you intended to import SettingsSVC as a service to include in your providers or as a module to include in imports:[]?

You cannot have both options simultaneously!

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