How data is automaticallly updated from 'null' to some actual 'data' ?

[roker15]

we call const { data, error } = useSWR('/api/user/123', fetcher)
and when not data !data, we show loading and when data is fetched we show data. so how does it happen automatically ? Does useSWR use some setState internally so that react component automatically updates?

[sairajchouhan]

Indeed check this

swr/src/utils/state.ts

Line 12 in 7dfd890

export const useStateWithDeps = <Data, Error, S = State<Data, Error>>(