web/web_notify/static/src/js/services/notification.esm.js

import {Notification} from "@web/core/notifications/notification";
import {patch} from "@web/core/utils/patch";

patch(Notification.props, {
    type: {
        type: String,
        optional: true,
        validate: (t) =>
            ["warning", "danger", "success", "info", "default"].includes(t),
    },
});