Use the fetch available in the environment instead of cross-fetch

For cloudflare workers and deno where there is fetch available in the environment already, currently we need initialise the client like this

const supabase = createClient(
    "https://yyy.supabase.co",  "xxx", {
      fetch: fetch.bind(globalThis),
    }
  );

Instead we should use the following algorithm to get fetch

• Use the custom fetch option when provided
• Use the global fetch if available
• else use cross-fetch

With Node implementing the fetch standard soon, fetch is a global we can reasonably assume the existence of in most envionments and only load cross-fetch as a polyfill. cross-fetch also assumes the presence of XMLHttpRequest which leads to a lot of errors.

Client libraries to update

• storage-js
• postgrest-js
• realtime-js (doesn’t use fetch)
• gotrue-js

[inian]

Thanks a lot @soedirgo! 💟 Can you make a final release to supabase-js with these?

[Crenshinibon]

https://github.com/supabase/supabase-js/issues/613