组件化封装，为什么提示：ToastModal is not defined，怎么修改正确。

import Swal from ‘sweetalert2’

class Toast {

static  ToastModal = Swal.mixin({
    toast: true,
    position: 'top-end',
    showConfirmButton: false,
    timer: 3000,
    timerProgressBar: true,
    onOpen: (toast) => {
        toast.addEventListener('mouseenter', Swal.stopTimer)
        toast.addEventListener('mouseleave', Swal.resumeTimer)
    }
});




static success(message) {


    ToastModal.fire({
        icon: 'success',
        title: message
    });
}

static error(message) {
    ToastModal.fire({
        icon: 'error',
        title: message
    });
}


static warning(message) {
    ToastModal.fire({
        icon: 'warning',
        title: message
    });
}

}

export {
Toast
}