[ANGULAR-TYPSCRIPT] Error during template compile of 'SwaggerModule' Only initialized variables and constants can be referenced in decorators because the value of this variable is needed by the template compiler in 'BASE_PATH' 'BASE_PATH' references 'BASE_PATH' 'BASE_PATH' is not initialized at

[OkeTennie1]

Description

We generate an Typscripte Api client for Angular with this Mavenplugin https://github.com/swagger-api/swagger-codegen/tree/master/modules/swagger-codegen-maven-plugin . After that we publish the generated client code to a private npm repro. Then we integrate it into an Angular project and embed like in this tutorial: https://angular.schule/blog/2018-04-swagger-codegen .

after building the project with the folowing command
ng serve --prod

We get the follwing error:

Error during template compile of 'SwaggerModule' Only initialized variables and constants can be referenced in decorators because the value of this variable is needed by the template compiler in 'BASE_PATH' 'BASE_PATH' references 'BASE_PATH' 'BASE_PATH' is not initialized at ..

ng serve without production works totaly fine.

Swagger-codegen version

2.31

Swagger declaration file content or url

Command line used for generation

<language>typescript-angular</language> 
<output>...</output>                               
<configOptions>
         <packageName>labcom.agriportal</packageName>
          <npmName>@swagger/AgriportalProxy</npmName>
          <npmVersion>0.0.4</npmVersion>
          <snapshot>true</snapshot>    
          <ngVersion>5.2.10</ngVersion>
          <npmRepository>... </npmRepository>
</configOptions>

Steps to reproduce

1. generate Typscript Api Client for Angular 5.2.10
2. publish to npm
3. import it into an plain angular project
4. Set BASE_PATH in the AppModule like:
   import { ApiModule, BASE_PATH } from 'swaggerPackage ... providers: [{ provide: BASE_PATH, useValue: environment.API_BASE_PATH }], '
5. Build project in production mode with:
   ng serve --prod

Related issues/PRs

Suggest a fix/enhancement

[macjohnny]

@OkeTennie1 could you please post the content of your app.module.ts?

[OkeTennie1]

The app.module.ts look like this:

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { ApiModule, BASE_PATH } from 'swaggerPackage';
import { environment } from '../environments/environment';


import { AppComponent } from './app.component';
import { HttpClientModule } from '@angular/common/http';


@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    ApiModule, 
    HttpClientModule
  ],
  providers: [{ provide: BASE_PATH, useValue: environment.API_BASE_PATH }],
  bootstrap: [AppComponent]
})
export class AppModule { }

[LoW0lf]

@OkeTennie1 seems to be related to the following issue #6722, which is is fixed and merged into master but no released yet (#7984).

We temporary use a work-around by using ngc instead of tsc for building the generated client with npm install. (angular/compiler-cli needs to be added as devDependency first).