Admin only
{/snippet}\n {#snippet fallback()}Checking permissions...
{/snippet}\n\n```\n\n---\n\n## Firestore\n\n### Reactive document\n\n```svelte\n\n\n{#if post.loading}Loading...
{/if}\n{#if post.data}{post.data.title}
{/if}\n```\n\nUsing the `{post.title}
\n {/snippet}\n {#snippet loading()}Loading...
{/snippet}\n{post.title}
\n{/each}\n```\n\n**Cursor-based pagination:**\n\n```ts\nawait posts.setPagination(10); // 10 per page, switches to one-time fetch\nawait posts.nextPage(); // next page (replaces data)\nawait posts.prevPage(); // previous page\nawait posts.loadMore(); // append next page (infinite scroll)\nawait posts.resetPagination(); // back to page 1\n\nposts.currentPage // number\nposts.hasMore // boolean\n```\n\n**Fluent query builder:**\n\n```ts\nimport { FirekitQueryBuilder } from 'svelte-firekit';\n\nconst constraints = new FirekitQueryBuilderVisitors: {counter.data}
\n\n{#each messages.list as msg}\n{msg.text}
\n{/each}\n```\n\n```ts\nawait counter.set(42);\nawait counter.update({ count: 10 });\nawait messages.push({ text: 'Hello!', userId: uid });\nawait messages.remove();\nconst once = await messages.fetchOnce();\n```\n\nUsing the `{messages}
{/snippet}\n{item.name}
{/each}\n```\n\n### File upload validation\n\nValidate files before uploading — checks size, MIME type, and image dimensions.\n\n```ts\nimport { validateFile } from 'svelte-firekit';\n\nconst result = await validateFile(file, {\n maxSize: 5 * 1024 * 1024, // 5 MB\n accept: ['image/png', 'image/jpeg', '.webp'],\n maxWidth: 2048,\n maxHeight: 2048,\n minWidth: 100\n});\n\nif (!result.valid) {\n result.errors.forEach((e) => console.log(e.code, e.message));\n}\n```\n\nThe `{err.message}
{/each}\n {/snippet}\nYou're offline. Changes will sync when reconnected.
\n{:else if firekitNetwork.hasPendingWrites}\nSaving...
\n{:else}\nAll changes saved
\n{/if}\n```\n\nUsing the `