Comment by apsurd

react can be pure functions that take in props. Given a set of props, ideally data primitives, the outputted view is guaranteed. it's nice.

In practice, the entire JS ecosystem enjoys flying off the rails, every season, but it's not strictly react's fault.

To answer your question, however those props get into the component is up the the M & C. can be async server, or shoved in as json in the script tag.