src/reportWebVitals.ts


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import { ReportHandler } from 'web-vitals';

type FuncType = (onPerfEntry?: ReportHandler) => void;

const reportWebVitals: FuncType = (onPerfEntry?: ReportHandler) => {
  if (onPerfEntry !== null && onPerfEntry instanceof Function) {
    void import('web-vitals').then(({ getCLS, getFID, getFCP, getLCP, getTTFB }) => {
      getCLS(onPerfEntry);
      getFID(onPerfEntry);
      getFCP(onPerfEntry);
      getLCP(onPerfEntry);
      getTTFB(onPerfEntry);
    });
  }
};

export default reportWebVitals;