I believe it's in the blog post: https://reactjs.org/blog/2018/03/27/update-on-async-rendering.html#fetching-external-data-when-props-change https://reactjs.or

I believe it's in the blog post: https://reactjs.org/blog/2018/03/27/update-on-async-rendering.html#fetching-external-data-when-props-change https://reactjs.org/blog/2018/03/27/update-on-async-renderin... (TLDR: Use `componentDidUpdate` for this.) Have you had a chance to skim through it?