Global App Injector in Angular below v14

app-injector.ts

import {Injector} from '@angular/core';

export class AppInjector {

    private static injector: Injector;

    static setInjector(injector: Injector) {
        AppInjector.injector = injector;
    }

    static getInjector(): Injector {
        return AppInjector.injector;
    }

}

get-service.ts

export function getService<T>(serviceType: Type<T>): T {
        const injector = AppInjector.getInjector();

        return injector.get(type);
    }

main.ts

platformBrowserDynamic()
    .bootstrapModule(AppModule)
    .then(
        (moduleRef) => {
            AppInjector.setInjector(moduleRef.injector);
        }
    )
    .catch(err => console.log(err));

usage-example.ts

this.reportService = getService(ReportService);