Pin Bun to 1.3.5 in CI, fix FetchFn types

Author: ndbroadbent

.github/workflows/ci.yml

@@ -25,7 +25,7 @@ jobs:
       - name: Setup Bun
         uses: oven-sh/setup-bun@v2
         with:
-          bun-version: latest
+          bun-version: 1.3.5
 
       - name: Install dependencies
         run: bun install --frozen-lockfile

src/search/openlibrary.ts

@@ -14,9 +14,9 @@ import { DEFAULT_TIMEOUT, DEFAULT_USER_AGENT } from './types'
 const SEARCH_API = 'https://openlibrary.org/search.json'
 
 /**
- * Fetch function type - compatible with both HttpResponse and standard Response.
+ * Fetch function type - returns HttpResponse which standard Response satisfies.
  */
-type FetchFn = (url: string, init?: RequestInit) => Promise<HttpResponse | Response>
+type FetchFn = (url: string, init?: RequestInit) => Promise<HttpResponse>
 
 /**
  * Configuration for Open Library search.

src/search/wikidata.ts

@@ -20,9 +20,9 @@ import {
 const SPARQL_ENDPOINT = 'https://query.wikidata.org/sparql'
 
 /**
- * Fetch function type - compatible with both HttpResponse and standard Response.
+ * Fetch function type - returns HttpResponse which standard Response satisfies.
  */
-type FetchFn = (url: string, init?: RequestInit) => Promise<HttpResponse | Response>
+type FetchFn = (url: string, init?: RequestInit) => Promise<HttpResponse>
 
 /**
  * Configuration for Wikidata search.