RocketChat/Rocket.Chat

import { settings } from '../../../settings/server';

export const validateName = function (name: string): boolean {
    const blockedNames = settings.get('Accounts_SystemBlockedUsernameList');
    if (!blockedNames || typeof blockedNames !== 'string') {
        return true;
    }

    if (blockedNames.split(',').includes(name.toLowerCase())) {
        return false;
    }

    return true;
};