React Profiler: "Timeline profiling not supported"?

I can’t tell yet whether this has any relationship to Meteor. But someone here may still have the answer. :slight_smile:

I’m debugging my React app on Mac using Chrome. I’ve installed React 18, and the latest React Devtools Chrome extension:

enter image description here

When I go to the React Profiler tab and click the record button, I see:

Timeline profiling not supported. Timeline profiler requires a development or profiling build of react-dom@^18.

Click here to learn more about profiling.

Okay, so I go to the React docs and it talks about adding a <Profiler> component. I did that and still get the same error.

What am I missing?

are you sure your app is running react 18?
I’ve just checked my test app and timeline feature works (I’ve never used this before :slight_smile: )

Here’s what’s in package.json:

"react": "^18.2.0",