What is the default Fetcher function?

[thiagonunesbatista]

I started reading the documentation of SWR and I discovered that exists an optional param to useSwr called fetcher (a function to fetch data). If I just pass the key to useSwr and don't pass a fetcher, what function or code will be executed to fetch the data?

const { data, error } = useSwr('https://api.chucknorris.io/jokes/random')

[promer94]

https://swr.vercel.app/docs/options#options

fetcher = window.fetch(url).then(res => res.json())

[kraynel]

This is no longner the case since SWR 1.0. The default fetcher function is now null, which trigger no network call whatsoever.
https://swr.vercel.app/blog/swr-v1#no-more-default-fetcher