Is it possible to fix all parameters using @Injectable as well as @Inject?

Recently, as I've been making the switch to Angular 5, I encountered an error with my ApiService that I can't seem to resolve: can't resolve all parameters for ApiService(?)

Oddly enough, this issue only started cropping up after I introduced some new components, none of which actually interact with the service in question. Prior to this, everything was working smoothly with ApiService. Here's a snippet of what my ApiService code looks like:

import { Injectable } from '@angular/core';
import { HttpClient, HttpHeaders } from '@angular/common/http';
...
@Injectable()
export class ApiService {
    constructor(private http: HttpClient)
}
... 

I made sure 'emitDecoratorMetadata' is set to true in my tsconfig.json file. Additionally, I have ApiService configured properly as a provider and imported in my app.module.ts file.

Strangely enough, when I added both @Injectable and @Inject decorators, the compilation went through without errors (I did this as a troubleshooting step, although it shouldn't be necessary).

Could there be another configuration setting I'm overlooking? Despite following advice mentioning the inclusion of @Injectable(), emitDecoratorMetadata, or adding the service to the providers array in app.module.ts – all steps that I've taken – ApiService ceased functioning correctly once new components were introduced.

I'm using webpack-dev-server for hosting my application. Interestingly, if I run 'ng serve', everything works fine, indicating a potential misconfiguration with webpack-dev-server. Is there a possibility of a recent update necessitating adjustments to my configurations?

Any tips or guidance would be greatly appreciated!

Answer №1

Eureka! 'Uncaught Error: Can't resolve all parameters for' runtime error when transitioning from Angular 4 to version 5.0.1

After some investigation, I discovered that simply adding

import 'core-js/es6/reflect';
import 'core-js/es7/reflect';

to my polyfills.ts file solved the issue. It appears to be a specific problem when upgrading to Angular 5. Hopefully, this solution will assist others facing similar challenges!

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