import type { DefaultFormat, EditorPlugin, IEditor, PluginEvent } from 'roosterjs-editor-types';
/**
 * A watermark plugin to manage watermark string for roosterjs
 */
export default class Watermark implements EditorPlugin {
    private watermark;
    private customClass?;
    private editor;
    private disposer;
    private format;
    /**
     * Create an instance of Watermark plugin
     * @param watermark The watermark string
     */
    constructor(watermark: string, format?: DefaultFormat, customClass?: string | undefined);
    /**
     * Updates the watermark text.
     * @param watermark - The new watermark text.
     */
    updateWatermark(watermark: string): void;
    /**
     * Get a friendly name of  this plugin
     */
    getName(): string;
    /**
     * Initialize this plugin. This should only be called from Editor
     * @param editor Editor instance
     */
    initialize(editor: IEditor): void;
    /**
     * Dispose this plugin
     */
    dispose(): void;
    /**
     * Handle events triggered from editor
     * @param event PluginEvent object
     */
    onPluginEvent(event: PluginEvent): void;
    private showHideWatermark;
    private removeWatermark;
}