React 16 JavaScript Environment.md

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https://reactjs.org/docs/javascript-environment-requirements.html

@guyellis I found some site has polyfill like this:
<script defer>window.Map||document.write('<script src="https://cdn.polyfill.io/v2/polyfill.min.js"></script>')</script>
How about this solution.

I am using create-react-app and trying to implement this but it does not support passing jest.setupFiles in the package.json. I've been going through the jest docs but haven't found anything yet on a CLI flag for passing this information to react-scripts test. Has anyone figured this out?

@rockchalkwushock Have you tried putting the config in src/setupTests.js?
doc: https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md#initializing-test-environment

@pedro-mass

Thanks! Now I understand that --setupTestFrameworkScriptFile is the CLI flag as well. So thankful for --showConfig to see the underlying config being applied 🙏

this fixed the issue for me in Jest jestjs/jest#4545 (comment)

Cheers, @capaj!

>$  yarn add raf --dev

// package.json
...

"jest": {
  "setupFiles": [
      "raf/polyfill"
    ]
},

...

BEFORE

AFTER

@capaj, Great... 👍

// package.json

...
"setupFiles": [
"raf/polyfill"
]
...

Thanks!.. am using jest package and now its fixed my console warning
console.error node_modules/fbjs/lib/warning.js:33
Warning: React depends on requestAnimationFrame. Make sure that you load a polyfill in older browsers. http://fb.me/react-polyfills

@capaj, thanks!)

@capaj, Thanks!!!

@capaj, Thanks!