How can I add a function to exit the window by pressing ESC?

👉 Add this snippet after you build the UI (inside grep_edit() after GREPeditor.show(); or before):

// Close palette when pressing ESC
GREPeditor.addEventListener("keydown", function (k) {
    if (k.keyName === "Escape") {
        GREPeditor.close();
    }
});