demeter

 1const 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
13export default reportWebVitals;