How to use SweetAlert2 in onPreClose event

This is my code below, as SweetAlert2 is async alert.

It is working to some extent, the editor close already before the preClose

editor.on('preClose', async function (e) {
                        // On close, check if the values have changed and ask for closing confirmation if they have
                        if (openVals !== JSON.stringify(Jobeditor_@(item.JobPrimaryID).get())) {
                            return   await editorConfirmAlert("You have unsaved changes. Are you sure you want to exit?", "Are you sure?")
                                    .then(function (result) {
                                        if (result.value) {
                                            return true
                                        } else {
                                            return false
                                        }
                                    });
                             //i am not using this confirm
                            //return confirm('You have unsaved changes. Are you sure you want to exit?');
                        }
                    })
                })