import type { Generic } from 'adopted-style-sheets';
import type { WatchStringOptions } from '../utils';
export type PlaceholderPropType = string;
export type PropPlaceholder = {
    placeholder: PlaceholderPropType;
};
export declare const validatePlaceholder: (component: Generic.Element.Component, value?: PlaceholderPropType, options?: WatchStringOptions) => void;