add infinite scroll

src/lib/hooks/getPosts.ts

@@ -1,17 +1,21 @@
 import { apiBase } from "@/stores/url";
 import { sesionStore } from "@/stores/usuario";
 import { get } from "svelte/store";
+import type { Post } from '../../types';
+import { PAGE_SIZE } from '../stores/posts';
 
-export async function getPosts() {
+export async function getPosts(page: number = 1): Promise<Post[]> {
+	const token = get(sesionStore)?.accessToken;
 
+	const headers: HeadersInit = {};
+	if (token) headers.Authorization = `Bearer ${token}`;
 
-	const req = await fetch(`${get(apiBase)}/timeline?pageSize=20`,{
-	headers: {
-	Authorization: `Bearer ${get(sesionStore)?.accessToken}`
+	const res = await fetch(
+		`${get(apiBase)}/timeline?page=${page}&pageSize=${PAGE_SIZE}`,
+		{ headers }
+	);
 
-	}
-	});
-	if (req.ok) {
-		return await req.json();
-	}
-}
+	if (!res.ok) throw new Error('Error cargando posts');
+
+	return res.json();
+}

src/lib/hooks/loadMorePosts.ts

@@ -0,0 +1,32 @@
+import { get } from 'svelte/store';
+import { page, loadingPosts, PAGE_SIZE } from '@/stores/posts';
+import { appendPosts } from '@/stores/posts';
+import { getPosts } from './getPosts';
+
+let finished = false;
+
+export async function loadMorePosts() {
+	if (get(loadingPosts) || finished) return;
+
+	loadingPosts.set(true);
+
+	try {
+		const currentPage = get(page);
+		const newPosts = await getPosts(currentPage);
+
+		if (newPosts.length === 0) {
+			finished = true;
+			return;
+		}
+
+		appendPosts(newPosts);
+
+		if (newPosts.length < PAGE_SIZE) {
+			finished = true;
+		} else {
+			page.update(p => p + 1);
+		}
+	} finally {
+		loadingPosts.set(false);
+	}
+}