React-devtools: Uncaught ReferenceError: performanceNow is not defined

[wietsedevries]

After hours of pulling my hair I found that React developer tools causes a referenceError on sites using Relay. Check example No idea why, but haven't experienced this issue before today.

[ethulia]

This is affecting us too. No one with react dev tools installed can use our site :(

[Rodeoclash]

Confirm that I'm getting this as well, looks like something broke in the last release.

Like @wietsedevries I'm using Relay so perhaps related to that.

[timsuchanek]

Same here. We're using Relay 0.9.3. Also no one with dev tools can use our app anymore :/

[gaearon]

I'm sorry about that, I screwed up. The issue was fixed in latest update (released about 30 hours ago) so the issue will go away when people's addon gets updated. Chrome does this automatically.

[gaearon]

Can you verify that your sites work with React DevTools 2.1.3 (latest version)?

[gaearon]

Going to close this as I assume they do, but let me know if not!

[timsuchanek]

@gaearon thanks for the fast reaction! It is indeed fixed in 2.1.3.
In the meantime until all plugins are updated, we btw use this small workaround:
https://github.com/csnover/TraceKit
and

TraceKit.report.subscribe((error) => {
  if (error.message === 'performanceNow is not defined') {
    alert(
      'The console cannot start because you are using React Devtools, '
      + 'which have a problem with Relay at the moment. '
      + 'Please disable React Devtools. If that doesn\'t help, please '
      + 'consult us in Slack. Thanks for your understanding.',
    )
  }
})