Password Validator for ionic apps

password.validator.ts

import { FormControl, FormGroup } from '@angular/forms';

export class PasswordValidator {
static areEqual(formGroup: FormGroup) {
	let val;
	let valid = true;

	for (let key in formGroup.controls) {
		if (formGroup.controls.hasOwnProperty(key)) {
			let control: FormControl = <FormControl>formGroup.controls[key];
			if (val === undefined) {
				val = control.value
			} else { 
				if (val !== control.value) {
					valid = false;
					break;
				}
			}
		}
	}
	if (valid) {
		return null;
	}
	return {
		areEqual: true
	}
 }
}