React dev tools - Deactivate “break on warnings”

Question

While developing with create-react-app, my browser enters debugger mode on warnings:

It breaks on the source code of react-dev-tools:

Answer 1

Chrome has a "BlackBox script" feature which is useful in this case.

1. Go to Chrome Developer tools -> source tab
2. Select "react_developer_tools.js" from the left pane
3. Right-click file and select "Blackbox script"

Answer 2

Go to your ReactDev tools in the tab Debugging and disable "Break on Warning".

I think this new behavior started today with this new PR: https://github.com/facebook/react/pull/19048

Answer 3

Go to Chrome Devtools → in the Chrome console, go to Component → Click on Settings → unset Break on Warning. Do the same in Profiler → Settings → unset Break on warning.

@cadoman pointed check and then uncheck to make work for sure.

P.S: Image from https://github.com/facebook/react/issues/19308#issuecomment-656669792

Answer 4

The issue is due to a recent release. A Workaround proposed by the React team is:

• Go to Chrome Developer Tools
• Click on the Components Tab (React Developer Tools Extension)
• Click on the Settings icon (located next to the component search box)
• Once modal opens select the Debugging tab
• Finally, double click on the Break on Warnings checkbox (check and unchecked)

Make sure at last the Break on Warnings checkbox is unchecked.

Reference: Issue link

Answer 5

It's a known issue. A workaround is posted on GitHub: Bug: Unexpected debugger statement in DevTools (solved) #19308

Answer 6

Based on pull request DevTools: Make break-on-warn off by default #19309 it seems it's a bug.

The Break On Warnings box was unchecked for me and it still would break. Removing and readding the extension to force an update fixed it for me.

I don't know of another way to force Chrome to update an extension outside of its regular schedule.