Custom Proper email validation

app.shared.validators.ts

import { AbstractControl } from '@angular/forms';

export function ValidateProperEmail(control: AbstractControl) {

    const error = { properEmail: true };

    if (!control.value) {
        return error;
    }

    if (!control.value.includes('@')) {
        return error;
    }

    const domain = control.value.split('@')[1];

    if (!domain.includes('.')) {
        return error;
    }

    const tld = domain.split('.')[
        domain.split('.').length - 1
    ];

    if (!tld.match(/^[A-Za-z]+$/)) {
        return error;
    }

    return null;
}