import { Factory, CssKnownProps, CssRule, CssVars } from '@cssfn/core';
export interface ForegroundVars {
    /**
     * functional foreground color.
     */
    foregFn: any;
    /**
     * final foreground color.
     */
    foreg: any;
    /**
     * functional alternate foreground color.
     */
    altForegFn: any;
    /**
     * final alternate foreground color.
     */
    altForeg: any;
}
export interface ForegroundStuff {
    foregroundRule: Factory<CssRule>;
    foregroundVars: CssVars<ForegroundVars>;
}
export interface ForegroundConfig {
    foreg?: CssKnownProps['foreground'];
    altForeg?: CssKnownProps['foreground'];
}
/**
 * Uses foreground color (text color).
 * @param config  A configuration of `foregroundRule`.
 * @returns A `ForegroundStuff` represents the foreground rules.
 */
export declare const usesForeground: (config?: ForegroundConfig) => ForegroundStuff;