My apologies if this kind of content is not allowed here. Mod(s) please feel free to delete it if it is not without any butthurt on my part.

I'm new to React Testing, so I am taking an Udemy course on it. The Udemy course uses yarn, so I would like to stick with that though I do know yarn isn't the top accepted tool in the React community.

I've posted this question elsewhere, I haven't gotten any responses, so I am posting it here ( costs nothing ).

I am getting this error when executing yarn build:

$ yarn build
yarn run v1.22.22
$ react-scripts build
Creating an optimized production build...
Failed to compile.

TS2305: Module '"web-vitals"' has no exported member 'ReportHandler'.
  > 1 | import { ReportHandler } from 'web-vitals';
      |          ^^^^^^^^^^^^^
    2 |
    3 | const reportWebVitals = (onPerfEntry?: ReportHandler) => {   
    4 |   if (onPerfEntry && onPerfEntry instanceof Function) {      


error Command failed with exit code 1.

I've tried installing web-vitals over what is already in the modules section, but that hasn't helped.

Any clues appreciated!

Update: the tip about ReportHandler being deprecated helped. I ran create react app in a new folder, did NOT run yarn update as the instructor called for,moved my work over, and now everything runs fine.

Is anyone here taking online courses e.g. Udacity, Coursera, Udemy, etc.? I just finished the Udacity AI Programming in Python course not long ago, and it was with a bit of gnashing of teeth towards the end. :[ The funny thing is, it wasn't (just) because it was technically challenging, but mostly learning-related anxiety and procrastination.

I'm curious about what others in the Tildes community are learning via massive open online courses (MOOCs), and what you think about them.

• How have online courses helped your career/personal goals (or did not meet expectations)?
• What do you think can be done better by these course providers or other entities?

In a meta-sort of way, I'm building a platform called MindsMatch help other learners finish their online courses faster. We are looking for users to alpha-test if you are interested!