const reportWebVitals = onPerfEntry => { if (onPerfEntry && onPerfEntry instanceof Function) { import('web-vitals').then(({ getCLS, getFID, getFCP, getLCP, getTTFB }) => { getCLS(onPerfEntry) getFID(onPerfEntry) getFCP(onPerfEntry) getLCP(onPerfEntry) getTTFB(onPerfEntry) }) } } export default reportWebVitals