import { type CustomElementTagName } from '../custom-tag-name.js';
/**
 * Base requirement for all CSS property names (like CSS var names).
 *
 * @category Internal
 */
export type BaseCssPropertyName<ElementTagName extends CustomElementTagName> = `${ElementTagName}-${string}`;
/**
 * Asserts that all the given CSS properties for the given element are valid.
 *
 * @category Internal
 */
export declare function assertValidCssProperties(elementTagName: CustomElementTagName, cssProperties: Record<BaseCssPropertyName<CustomElementTagName>, any>): void;