fix(fetch-wrapper): improve error message when 'fetch' implementation is not present (#617)

chore(fetch-wrapper): improve error message when 'fetch' implementation is not present

Author: oscard0m

src/fetch-wrapper.ts

@@ -32,7 +32,7 @@ export default function fetchWrapper(
 
   if (!fetch) {
     throw new Error(
-      'Global "fetch" not found. Please provide `options.request.fetch` to octokit or upgrade to node@18 or newer.',
+      "fetch is not set. Please pass a fetch implementation as new Octokit({ request: { fetch }}). Learn more at https://github.com/octokit/octokit.js/#fetch-missing",
     );
   }
 

test/request.test.ts

@@ -396,7 +396,7 @@ x//0u+zd/R/QRUzLOw4N72/Hu+UG6MNt5iDZFCtapRaKt6OvSBwy8w==
     }
     globalThis.fetch = originalFetch;
     expect(error?.message).toEqual(
-      'Global "fetch" not found. Please provide `options.request.fetch` to octokit or upgrade to node@18 or newer.',
+      "fetch is not set. Please pass a fetch implementation as new Octokit({ request: { fetch }}). Learn more at https://github.com/octokit/octokit.js/#fetch-missing",
     );
   });