export declare function observeFirstScreenPaint(callback: any): void;
export declare function getFCP(callback: any): void;
export declare function getLCP(callback: any): void;
export declare function getFID(callback: any): void;
export declare function getCLS(callback: any): void;
export declare function getTTFB(callback: any): void;
export declare function getWebVitals(callback: any): void;