import {ReportHandler} from 'web-vitals'; const reportWebVitals = (onPerfEntry?: ReportHandler) => { 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;