Circular dependency injection angular 2 -

i've been struggling around injecting services each other. following blog circular dependency in constructors , dependency injection kind of confusing says

one of 2 objects hiding object c

i following error while injecting service class each other

can't resolve parameters payrollservice: (siteservice, storageservice, sweetalertservice, ?)

//abstractmodal.service.ts @injectable()  export abstract class abstractmodel {     abstract collection = [];     constructor(private siteservice: siteservice, private storageservice: storageservice,                 private sweetalertservice: sweetalertservice) {}      setcollectionempty() {       this.collection = [];     } } //account-payable.service.ts @injectable() export class accountpayableservice extends abstractmodel {     public collection = [];     constructor(private ss: siteservice,private sts: storageservice, private sws: sweetalertservice,             private accpposervice: payablepurchaseorderservice, private attachmentservice: attachmentservice,             private injectorservice: injectorservice) {           super(ss, sts, sws);      } } //injector.service.ts @injectable() export class injectorservice {    constructor(private payrollservice: payrollservice) {}     cleanpayrollcollection() {      this.payrollservice.setcollectionempty();    } } //payroll.service.ts @injectable() export class payrollservice extends abstractmodel {     public collection = [];     constructor(private ss: siteservice,private sts: storageservice, private sws: sweetalertservice,             private accpservice: accountpayableservice) {      super(ss, sts, sws);    } } 

your comments , answered appreciated lot.

thanks

you can workaround circular dependencies injecting injector instead of 1 of services cause circular dependency

private payrollservice:payrollservice; constructor(/*private payrollservice:payrollservice*/ injector:injector) {   settimeout(() => this.payrollservice = injector.get(payrollservice)); }