/**
 * Small utility to provide 100vw and 100vh alternative CSS Variables
 * - vwProp (default: `--100vw`) - scroll independent viewport width value
 * - vhProp (default: `--100vh`) - device independent viewport height value (also known as 100vh iOS fix)
 */
export declare class ESLVSizeCSSProxy {
    static vwProp: string;
    static vhProp: string;
    /** Inits custom CSS variables for viewport sizes and it's observation */
    static observe(): void;
    /** Destroys observer */
    static destroy(): void;
    /** Update custom CSS variables with actual viewport sizes */
    protected static update(): void;
    protected static readonly updateDebounced: any;
    /** @returns current viewport width */
    static get viewportWidth(): number;
    /** @returns current viewport height */
    static get viewportHeight(): number;
}