How to use the @rxweb/reactive-form-validators.RxwebValidators.different function in @rxweb/reactive-form-validators

() => {
          let formBuilder = new FormBuilder();
          let formGroup = formBuilder.group({
			'firstName':['Mukesh'],
            'middleName':'Mukesh'
          });
          expect(RxwebValidators.different({fieldName:'firstName',message:'{{0}} is same as firstName'})(formGroup.controls.middleName)).toEqual({'different':{ message: 'Mukesh is same as firstName', refValues: [ 'Mukesh','Mukesh' ] } }); 
        });

ngOnInit() {
        this.accountInfoFormGroup = this.formBuilder.group({
            firstName:['',], 
            password:['', RxwebValidators.different({fieldName:"firstName"  ,message:'{{0}} is same as firstName' })], 
            lastName:['', RxwebValidators.different({fieldName:"firstName"  ,conditionalExpression:(x,y) => x.firstName == "Bharat"  })], 
            userName:['', RxwebValidators.different({fieldName:"firstName"  ,conditionalExpression:'x => x.firstName == "Bharat"' })], 
        });
    }
}

ngOnInit() {
        this.accountInfoFormGroup = this.formBuilder.group({
            firstName:['',], 
            userName:['', RxwebValidators.different({fieldName:"firstName"  ,conditionalExpression:'x => x.firstName == "Bharat"' })], 
            lastName:['', RxwebValidators.different({fieldName:"firstName"  ,conditionalExpression:(x,y) => x.firstName == "Bharat"  })], 
        });
    }
}

ngOnInit() {
        this.accountInfoFormGroup = this.formBuilder.group({
            firstName:['',], 
            userName:['', RxwebValidators.different({fieldName:"firstName"  ,conditionalExpression:'x => x.firstName == "Bharat"' })], 
            lastName:['', RxwebValidators.different({fieldName:"firstName"  ,conditionalExpression:(x,y) => x.firstName == "Bharat"  })], 
        });
    }
}

ngOnInit() {
        this.accountInfoFormGroup = this.formBuilder.group({
            firstName:['',], 
            userName:['', RxwebValidators.different({fieldName:"firstName"  ,conditionalExpression:'x => x.firstName == "Bharat"' })], 
            password:['', RxwebValidators.different({fieldName:"firstName"  ,message:'{{0}} is same as firstName' })], 
        });
    }
}

ngOnInit() {
        this.accountInfoFormGroup = this.formBuilder.group({
            firstName:['',], 
            userName:['', RxwebValidators.different({fieldName:"firstName"  ,conditionalExpression:'x => x.firstName == "Bharat"' })], 
            password:['', RxwebValidators.different({fieldName:"firstName"  ,message:'{{0}} is same as firstName' })], 
        });
    }
}

ngOnInit() {
        this.accountInfoFormGroup = this.formBuilder.group({
            firstName:['',], 
            lastName:['', RxwebValidators.different({fieldName:"firstName" })], 
        });
    }
}

ngOnInit() {
        this.accountInfoFormGroup = this.formBuilder.group({
            firstName:['',], 
            lastName:['', RxwebValidators.different({fieldName:'firstName' })], 
            middleName:['', RxwebValidators.different({fieldName:'firstName'  ,message:'{{0}} is same as firstName' })], 
        });
    }
}

ngOnInit() {
        this.accountInfoFormGroup = this.formBuilder.group({
            firstName:['',], 
            lastName:['', RxwebValidators.different({fieldName:"firstName" })], 
        });
    }
}

ngOnInit() {
        this.accountInfoFormGroup = this.formBuilder.group({
            firstName:['',], 
            lastName:['', RxwebValidators.different({fieldName:'firstName' })], 
        });
    }
}