import { ResponsiveStyle } from "../system";
export interface Rule {
    id: string;
    css: string;
}
export declare class Sheet {
    private static instance;
    private rules;
    private responsive;
    private pseudo;
    private cache;
    private constructor();
    static getInstance(): Sheet;
    addRule(css: string): string;
    addMediaRule(className: string, css: string, breakpoint: string): void;
    addPseudoRule(className: string, css: string, pseudo: string): void;
    removeDuplicates(): void;
    getCSS(): string;
    getFromCache(key: string): ResponsiveStyle | undefined;
    addToCache(key: string, styles: ResponsiveStyle): void;
    reset(): void;
}
export declare const sheet: Sheet;