SharedArrayBuffer will require cross-origin isolation as of M91, around May 2021

Question

When creating a react app via npx create-react-app and running it, a warning pops up in DevTools (Chrome 88 and 89):

scheduler.development.js:298 [Deprecation] SharedArrayBuffer will require cross-origin isolation as of M91, around May 2021. See https://developer.chrome.com/blog/enabling-shared-array-buffer/ for more details.

Environment

  current version of create-react-app: 4.0.1
  running from /Users/mahdi/.npm/_npx/25767/lib/node_modules/create-react-app
  Binaries:
    Node: 14.15.4 - ~/.nvm/versions/node/v14.15.4/bin/node
    Yarn: 1.22.4 - /usr/local/bin/yarn
    npm: 6.14.10 - ~/.nvm/versions/node/v14.15.4/bin/npm
  Browsers:
    Chrome: 88.0.4324.96
    Edge: 87.0.664.66
    Firefox: 84.0
    Safari: 14.0.2
  npmPackages:
    react: ^17.0.1 => 17.0.1
    react-dom: ^17.0.1 => 17.0.1
    react-scripts: Not Found
  npmGlobalPackages:
    create-react-app: Not Found

Steps to reproduce

1. npx create-react-app myapp
2. cd myapp && npm start Open
3. http://localhost:3000 in Chrome 88 or 89, regular or Incognito mode
4. Open DevTools: the warning is displayed

Any suggestion for resolving this warning?

Solution 1

Update the react and react-dom versions from 17.0.1 to ==> 17.0.2 could resolve this problem.

You just need to run npm update in the command prompt or bash, and hopefully you will see the changes in your package.json file. (yarn upgrade react --latest and yarn upgrade react-dom --latest if you want the upgrade to persist to the package.json)

Here is a git report from my app after applying the update:

Solution 2

As the warning shows, Chrome will require cross-origin isolation starting version 91 in order to use SharedArrayBuffer. As far as I know there is nothing you can do to resolve the warning other then wait for a react update.

Others are also having this issue as you can see here and here

The issue is fixed in this pull request but has not yet been released.

Edit: It is now fixed in version 17.0.2 of react.

Solution 3

Actually after update react-dom to the latest version solved by me the problem, react alone did not solve it:

npm i react@latest react-dom@latest

OR

yarn add react@latest react-dom@latest

Solution 4

For those not ready to upgrade to v17 yet (due to other legacy libraries), a simple workaround is to place the following code in any part of your index.html

    <script>
      // See https://github.com/facebook/react/issues/20829#issuecomment-802088260
      if (!crossOriginIsolated) SharedArrayBuffer = ArrayBuffer;
    </script>

Solution 5

Update the react and react-dom versions to 17.0.2, yarn upgrade react --latest and yarn upgrade react-dom --latest

Also if using @hot-loader/react-dom or react-hot-loader, need to run yarn upgrade @hot-loader/react-dom --latest and yarn upgrade react-hot-loader --latest also.

View more solutions

Comments

[Maran Sowthri]

I could still see the warning even after updating.

[MJBZA]

Did you restart your development server?

[Maran Sowthri]

oh I didn't. It's working fine now (after restarting). Thanks much for your response!

[Maran Sowthri]

"Don't forget to restart the server after updating npm packages."

[iDVB]

We still get this error even though we've updated to 17.0.2 for react and react-dom and have restarted dev server

[Orange]

I too can still the error after updating 17.0.2 and restarting the server

[Leonard]

I start a new project wit 17.0.2 and I still see this error... both React and react-dom.

[Ko Ohhashi]

my react app is still not cross origin isolated even after upgrading to v17.02. Even newly created app is not cross origin isolated. do you have any idea?