yatang/vendor/symfony/polyfill-intl-normalizer/Resources/stubs/Normalizer.php

<?php

class Normalizer extends Symfony\Polyfill\Intl\Normalizer\Normalizer
{
    const NONE = 1;
    const FORM_D = 2;
    const FORM_KD = 3;
    const FORM_C = 4;
    const FORM_KC = 5;
    const NFD = 2;
    const NFKD = 3;
    const NFC = 4;
    const NFKC = 5;
}