import { type AttributeReactiveClass } from '../../element-reactive/index.js';
import { XTextarea } from './XTextarea.js';
export declare class Placeholder implements InstanceType<AttributeReactiveClass<typeof XTextarea>> {
    #private;
    static observedAttributes: readonly ["placeholder", "placeholder-color", "placeholder-font-size", "placeholder-font-weight", "placeholder-font-family"];
    _updatePlaceholderColor: (this: void, newVal: string | null) => void;
    _updatePlaceholderFontSize: (this: void, newVal: string | null) => void;
    _updatePlaceholderFontWeight: (this: void, newVal: string | null) => void;
    _updatePlaceholderFontFamily: (this: void, newVal: string | null) => void;
    _handlePlaceholder: (this: void, newVal: string | null) => void;
    constructor(dom: HTMLElement);
}