export declare const defaultBreakpoints: Readonly<{
    sm: "576px";
    md: "768px";
    lg: "992px";
    xl: "1200px";
}>;
export declare class Theme {
    private static instance;
    private _breakpoints;
    private constructor();
    static getInstance(): Theme;
    setBreakpoints(breakpoints: Record<string, string>): void;
    getBreakpoints(): Record<string, string>;
    reset(): void;
}
export declare const theme: Theme;