chore: resolve oxlint warnings across web and SDK (#34540)

Co-authored-by: Asuka Minato <i@asukaminato.eu.org>

sdks/nodejs-client/src/http/client.test.ts

@@ -39,7 +39,7 @@ const jsonResponse = (
     ...init,
     headers: {
       "content-type": "application/json",
-      ...(init.headers ?? {}),
+      ...init.headers,
     },
   });
 
@@ -47,7 +47,7 @@ const textResponse = (body: string, init: ResponseInit = {}): Response =>
   new Response(body, {
     ...init,
     headers: {
-      ...(init.headers ?? {}),
+      ...init.headers,
     },
   });
 

sdks/nodejs-client/src/index.test.ts

@@ -14,7 +14,7 @@ const jsonResponse = (body: unknown, init: ResponseInit = {}): Response =>
     ...init,
     headers: {
       "content-type": "application/json",
-      ...(init.headers ?? {}),
+      ...init.headers,
     },
   });