Fix fetch to work in the edge and node environments, cleanup type issues

- Fix "TypeError: Invalid redirect value, must be one of "follow" or "manual" ("error" won't be implemented since it does not make sense at the edge; use "manual" and check the response status code)." that is thrown when trying to use fetch in the edge environment  (e.g., workers)
- Cleanup types and variable definitions.

nip05.ts

@@ -12,20 +12,24 @@ export type Nip05 = `${string}@${string}`
 export const NIP05_REGEX = /^(?:([\w.+-]+)@)?([\w_-]+(\.[\w_-]+)+)$/
 export const isNip05 = (value?: string | null): value is Nip05 => NIP05_REGEX.test(value || '')
 
-var _fetch: any
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+let _fetch: any
 
 try {
   _fetch = fetch
-} catch {}
+} catch (_) {null}
 
-export function useFetchImplementation(fetchImplementation: any) {
+export function useFetchImplementation(fetchImplementation: unknown) {
   _fetch = fetchImplementation
 }
 
 export async function searchDomain(domain: string, query = ''): Promise<{ [name: string]: string }> {
   try {
     const url = `https://${domain}/.well-known/nostr.json?name=${query}`
-    const res = await _fetch(url, { redirect: 'error' })
+    const res = await _fetch(url, { redirect: 'manual' })
+    if (res.status !== 200) {
+      throw Error("Wrong response code")
+    }
     const json = await res.json()
     return json.names
   } catch (_) {
@@ -37,20 +41,24 @@ export async function queryProfile(fullname: string): Promise<ProfilePointer | n
   const match = fullname.match(NIP05_REGEX)
   if (!match) return null
 
-  const [_, name = '_', domain] = match
+  const [, name = '_', domain] = match
 
   try {
     const url = `https://${domain}/.well-known/nostr.json?name=${name}`
-    const res = await (await _fetch(url, { redirect: 'error' })).json()
+    const res = await _fetch(url, { redirect: 'manual' })
+    if (res.status !== 200) {
+      throw Error("Wrong response code")
+    }
+    const json = await res.json()
 
-    let pubkey = res.names[name]
+    const pubkey = json.names[name]
-    return pubkey ? { pubkey, relays: res.relays?.[pubkey] } : null
+    return pubkey ? { pubkey, relays: json.relays?.[pubkey] } : null
   } catch (_e) {
     return null
   }
 }
 
 export async function isValid(pubkey: string, nip05: Nip05): Promise<boolean> {
-  let res = await queryProfile(nip05)
+  const res = await queryProfile(nip05)
   return res ? res.pubkey === pubkey : false
 }