Source: xxe/editor/ShowAlertEvent.js

/**
 * {@link XMLEditorEvent} sent by the server when an alert dialog box 
 * needs to be displayed.
 */
class ShowAlertEvent extends XMLEditorEvent {
    constructor(xmlEditor, data) {
        super(xmlEditor, data, "showAlert");
    }

    /**
     * Get the <code>messageType</code> property of this event:
     * "error", "warning" or "info".
     *
     * @type {string}
     */
    get messageType() {
        return this._messageType;
    }
    
    /**
     * Get the <code>message</code> property of this event:
     * the message to be displayed by the alert dialog box.
     *
     * @type {string}
     */
    get message() {
        return this._message;
    }
}