React 16 JavaScript Environment.md

This Page Has Moved To:

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

Confirming what @dubbha said. Needs to go in the first place.

Any chance you can just bake this into React 16? Why do we need to add it to application code? Who wouldn't want to have access to it?

@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!