"/src/reportWebVitals.js Module not found: Can't resolve 'web-vitals' in 'E:\ReactResources\RectProjects\test-app\src'"
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;
Delete all the files & Folders inside test-app folder. Reinstall all the packages now and start npm. It will work.
You need to install web vitals. Open your terminal and run the following command:
npm i web-vitals --save-dev
Also, deleting the whole thing and reinstalling might work, but that's a longer process.
If you have created your project with create-react-app, all the dependencies should be there when you run npm install.
Make sure you did that by navigating to the root directory and running:
npm install
For anyone coming here from starting a brand new app with create-react-app: If you are using npm but run create-react-app without explicitly specifying it, it will use yarn when available.
I was able to bypass this issue by adding the flag --use-npm.
So, for example:
npx create-react-app my-app --use-npm
I closed my terminal and opened again. Works for me!