github.com/hzck/speedroute@v0.0.0-20201115191102-403b7d0e443f/src/reportWebVitals.js (about) 1 const reportWebVitals = onPerfEntry => { 2 if (onPerfEntry && onPerfEntry instanceof Function) { 3 import('web-vitals').then(({ getCLS, getFID, getFCP, getLCP, getTTFB }) => { 4 getCLS(onPerfEntry); 5 getFID(onPerfEntry); 6 getFCP(onPerfEntry); 7 getLCP(onPerfEntry); 8 getTTFB(onPerfEntry); 9 }); 10 } 11 }; 12 13 export default reportWebVitals;