Troubleshooting NG0203 Error: Issues with Angular Library and HttpClient Injection in...

I wasn't able to solve it. I'm counting on your help.

I have an Angular application and a library.

In the library, I have a service where I inject HttpClient. I set HttpClient as a provider in the application. When I run the application using ng serve, everything works fine. However, when I create a build (ng build) and launch the application, I get error NG0203.

I've attached a link to the repository with this issue.

To run it:

1. Build the library (libs directory) - ng build
2. Launch the application (app1 directory) - ng serve
3. Create a production build (app1 directory) - ng build
4. Launch the build using, for example, a live server

Link to the repository:

https://github.com/tjaworski997/angular-library-inject-build-problem

I look forward to your help.

1. paths in tsconfig.json: "@angular/": ["./node_modules/@angular/"]
2. "preserveSymlinks": true in angular.json

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