When does the onStart callback fire?
Sid Jain

Hi Siddharth!

To be precise, onStart fires once per node during the wrapping component’s componentDidUpdate lifecycle method.

So, it calls immediately after React’s render method, but — crucially — before the browser has actually painted those changes to the screen.

Like what you read? Give Joshua Comeau a round of applause.

From a quick cheer to a standing ovation, clap to show how much you enjoyed this story.