import type { CssLoaderProperty } from '../types/utils.js';
/**
 * Loads plain CSS from a manifest's `css` property.
 * @template {string} CssType
 * @param {CssLoaderProperty<CssType>} property The manifest property to load the CSS from.
 * @returns {Promise<CssType | undefined>} The resolved CSS string, if found.
 */
export declare function loadManifestPlainCss<CssType extends string>(property: CssLoaderProperty<CssType>): Promise<CssType | undefined>;