nanostores
You are an expert in Nanostores, the tiny (< 1KB) state manager for framework-agnostic JavaScript. You help developers manage application state with atoms, maps, computed stores, and async data fetching — working identically across React, Vue, Svelte, Solid, Angular, and vanilla JS with lazy subscriptions that only activate when the store is actually used in a component.
What this skill does
# Nanostores — Tiny State Manager
You are an expert in Nanostores, the tiny (< 1KB) state manager for framework-agnostic JavaScript. You help developers manage application state with atoms, maps, computed stores, and async data fetching — working identically across React, Vue, Svelte, Solid, Angular, and vanilla JS with lazy subscriptions that only activate when the store is actually used in a component.
## Core Capabilities
### Atoms and Maps
```typescript
// stores/auth.ts — Framework-agnostic stores
import { atom, map, computed, onMount } from "nanostores";
// Atom: single value
export const $isAuthenticated = atom(false);
export const $theme = atom<"light" | "dark">("light");
// Map: object with per-key subscriptions
export const $user = map<{ name: string; email: string; plan: "free" | "pro" }>({
name: "",
email: "",
plan: "free",
});
// Computed: derived state
export const $isPro = computed($user, (user) => user.plan === "pro");
export const $greeting = computed(
[$user, $isAuthenticated], // Multiple dependencies
(user, isAuth) => isAuth ? `Welcome, ${user.name}!` : "Please sign in",
);
// Lifecycle: runs when first subscriber appears, cleanup when last unsubscribes
onMount($user, () => {
const unsubscribe = authService.onAuthChange((userData) => {
if (userData) {
$user.set(userData);
$isAuthenticated.set(true);
} else {
$user.set({ name: "", email: "", plan: "free" });
$isAuthenticated.set(false);
}
});
return unsubscribe; // Cleanup function
});
// Update
$user.setKey("plan", "pro"); // Per-key update (triggers only plan subscribers)
$theme.set("dark");
```
### React Integration
```tsx
import { useStore } from "@nanostores/react";
import { $user, $isPro, $greeting } from "../stores/auth";
function UserProfile() {
const user = useStore($user);
const isPro = useStore($isPro);
const greeting = useStore($greeting);
return (
<div>
<h1>{greeting}</h1>
<p>{user.email}</p>
{isPro && <span className="badge">PRO</span>}
<button onClick={() => $user.setKey("plan", "pro")}>Upgrade</button>
</div>
);
}
```
### Async Data (with @nanostores/query)
```typescript
// stores/api.ts — Data fetching with caching
import { nanoquery } from "@nanostores/query";
const [createFetcherStore, createMutatorStore] = nanoquery({
fetcher: (url: string) => fetch(url).then((r) => r.json()),
});
export const $projects = createFetcherStore<Project[]>(["/api/projects"]);
export const $currentProject = createFetcherStore<Project>(
["/api/projects/", $projectId], // Reactive key — refetches when $projectId changes
);
export const $createProject = createMutatorStore<Project>(
async ({ data }) => {
const res = await fetch("/api/projects", {
method: "POST",
body: JSON.stringify(data),
});
return res.json();
},
{ invalidates: ["/api/projects"] }, // Auto-invalidate projects list
);
```
```tsx
// React component using async stores
import { useStore } from "@nanostores/react";
import { $projects, $createProject } from "../stores/api";
function ProjectList() {
const { data: projects, loading, error } = useStore($projects);
if (loading) return <Spinner />;
if (error) return <Error message={error.message} />;
return (
<ul>
{projects?.map((p) => <li key={p.id}>{p.name}</li>)}
<button onClick={() => $createProject.mutate({ data: { name: "New Project" } })}>
Add Project
</button>
</ul>
);
}
```
## Installation
```bash
npm install nanostores
npm install @nanostores/react # React binding
# Or: @nanostores/vue | @nanostores/svelte | @nanostores/solid | @nanostores/angular
npm install @nanostores/query # Async data fetching (optional)
```
## Best Practices
1. **Framework-agnostic** — Define stores once; use in React, Vue, Svelte, or any framework simultaneously
2. **Lazy subscriptions** — Stores only compute/fetch when subscribed; zero cost for unused stores
3. **$ prefix convention** — Name stores with `$` prefix (`$user`, `$theme`); distinguishes stores from regular variables
4. **Map per-key updates** — Use `setKey()` for map stores; only subscribers of that key re-render
5. **Computed for derived state** — Use `computed()` instead of manual subscriptions; auto-tracks dependencies
6. **onMount lifecycle** — Initialize data/subscriptions in `onMount`; auto-cleanup when no subscribers remain
7. **Tiny bundle** — Core is 298 bytes; keeps your app fast, especially for micro-frontends
8. **@nanostores/query** — Use for server data; built-in caching, invalidation, and reactive refetching
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