separada la logica de publicar el post a la del manejo del front

src/lib/hooks/publicarPost.ts

@@ -0,0 +1,27 @@
+import { addPost } from "@/stores/posts";
+import { apiBase } from "@/stores/url";
+import { sesionStore } from "@/stores/usuario";
+import { get } from "svelte/store";
+
+export async function publicarPost(formData: FormData){
+  try{
+ 			const req = fetch(get(apiBase) + '/api/posts', {
+				method: 'POST',
+				//credentials: 'include',
+				headers: {
+					Authorization: `Bearer ${get(sesionStore)?.accessToken}`
+				},
+				body: formData
+			});
+
+			const res = await req;
+			if (res.ok) {
+				const post = await res.json();
+				addPost(post);
+				return '';
+			}
+			return 'No se pudo crear el post.';
+		} catch {
+			return 'Fallo al alcanzar el servidor';
+		}
+}