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Supports any value type, reactive Map mutations, updater functions, and AbortSignal integration.","maintainers":[{"name":"pilmee","email":"pilmee@gmail.com"}],"readme":"
\n \n
\n\n# SSignal\n\n[](https://www.npmjs.com/package/ssignal)\n[](https://www.npmjs.com/package/ssignal)\n[](https://github.com/ElJijuna/ssignal/actions/workflows/ci.yml)\n[](https://github.com/ElJijuna/ssignal/actions/workflows/release.yml)\n[](https://github.com/ElJijuna/ssignal/actions/workflows/web-audit-report.yml)\n[](https://bundlephobia.com/package/ssignal)\n[](LICENSE)\n[](https://nodejs.org)\n[](https://www.typescriptlang.org)\n[](https://semantic-release.gitbook.io/semantic-release/)\n[](https://github.com/ElJijuna/ssignal/stargazers)\n[](https://github.com/ElJijuna/ssignal/issues)\n\nA lightweight, zero-dependency reactive signal built on top of the native `EventTarget` API. `SSignal` lets you observe value changes on any data type — including deep mutations on `Map` instances — without a framework, build plugin, or compiler transform.\n\n## Features\n\n- **Simple API** — `value`, `subscribe`, and an unsubscribe function. That's it.\n- **Framework-agnostic** — works in the browser, Node.js ≥ 18.7, and any runtime that supports `EventTarget`.\n- **Reactive `Map` support** — mutations via `set()`, `delete()`, and `clear()` automatically dispatch change events.\n- **Updater functions** — `signal.value = (prev) => prev + 1` for safe derived updates.\n- **In-place mutations** — `signal.mutate((list) => list.push(item))` for arrays and objects, with a single change event.\n- **Immediate mode** — `{ immediate: true }` fires the callback with the current value on subscribe.\n- **One-time subscriptions** — `once()` listens for the next change only, then unsubscribes itself.\n- **Computed signals** — derive read-only signals from one or more sources with `computed()`.\n- **Effects** — `effect()` runs side effects now and on every change, with cleanup and a single dispose.\n- **Custom equality** — `{ equals }` decides when an assigned value counts as a change.\n- **Batched updates** — `batch()` groups several changes into one notification per signal.\n- **Disposable** — `dispose()` removes every subscription at once, and signals work with `using`.\n- **AbortSignal integration** — cancel subscriptions with a standard `AbortController`.\n- **TypeScript-first** — fully typed, zero `any` in the public API.\n- **Tree-shakeable** — `sideEffects: false`, ships ESM + CJS + UMD.\n\n## Installation\n\n```sh\nnpm install ssignal\n```\n\n### CDN (browser)\n\n```html\n\n```\n\n## API\n\n| Member | Description |\n| :----- | :---------- |\n| `new SSignal(value: T, options?)` | Creates a signal. `Map` values are automatically wrapped in a reactive proxy. Options: `SSignalOptions`. |\n| `signal.value` | Gets the current value. |\n| `signal.value = newValue \\| (prev: T) => T` | Sets a new value. Accepts a direct value or an updater function. No event is fired when the value does not change. |\n| `signal.mutate(mutator)` | Mutates the value in place (arrays, objects…) and fires one change event afterwards. Return `false` from the mutator to skip the event. Throws on computed signals. |\n| `signal.subscribe(callback, options?)` | Registers a listener called on every change. Returns an `Unsubscribe` function. Options: `SubscribeOptions`. |\n| `signal.once(callback, options?)` | Registers a listener called only on the next change, then unsubscribes automatically. Returns an `Unsubscribe` function. Options: `OnceOptions`. With `immediate`, it runs right away with the current value instead, and that is its only call. |\n| `computed(source, fn, options?)` | Creates a read-only `ComputedSignal` derived from one source. Accepts the same `equals` option. |\n| `computed([...sources], fn, options?)` | Creates a read-only `ComputedSignal` derived from multiple sources. Accepts the same `equals` option. |\n| `signal.dispose()` | Removes every `subscribe()`/`once()` subscription at once. The signal stays usable. Also available as `[Symbol.dispose]()` for `using`. |\n| `computed.dispose()` | Removes all source subscriptions and its own subscribers. Call when the signal is no longer needed. |\n| `effect(source, fn, options?)` | Runs `fn` with the current value, then after every change. `fn` may return a cleanup, called before the next run and on dispose. Returns a dispose function. Options: `EffectOptions`. |\n| `effect([...sources], fn, options?)` | Same, with the values of several sources as a tuple. Sources changed together in `batch()` cause a single run. |\n| `batch(fn)` | Runs `fn` and defers change events until it returns, so each changed signal notifies once with its final value. Returns what `fn` returns. |\n\n### Types\n\nAll types are exported from the package entry:\n\n```ts\nimport type {\n EffectCleanup,\n EffectOptions,\n OnceOptions,\n SSignalOptions,\n SubscribeOptions,\n Unsubscribe,\n} from 'ssignal';\n```\n\n| Type | Definition |\n| :--- | :--------- |\n| `Unsubscribe` | `() => void` |\n| `SubscribeOptions` | `{ signal?: AbortSignal; immediate?: boolean }` |\n| `OnceOptions` | `{ signal?: AbortSignal; immediate?: boolean }` |\n| `EffectOptions` | `{ signal?: AbortSignal }` |\n| `EffectCleanup` | `() => void` |\n| `SSignalOptions` | `{ equals?: (prev: T, next: T) => boolean }` |\n\n### Events\n\n| Event | Type | Description |\n| :---- | :--- | :---------- |\n| `change` | `CustomEvent` | Fired when the value changes. The new value is available as `event.detail`. |\n\n## Architecture\n\n```mermaid\nflowchart TD\n subgraph writes[\"Ways to change a signal\"]\n set[\"signal.value = next or (prev) => next\"]\n mutate[\"signal.mutate(fn)\"]\n coll[\"Map / Set proxy set · add · delete · clear\"]\n end\n\n set --> equals{\"equals(prev, next)? default Object.is\"}\n equals -- \"equal\" --> skip([\"ignored, no event\"])\n equals -- \"changed\" --> notify\n mutate -- \"unless fn returns false\" --> notify\n coll -- \"only if it really changed\" --> notify\n\n notify[\"#notify()\"] --> inBatch{\"inside batch()?\"}\n inBatch -- \"yes\" --> queue[(\"batch queue one entry per signal\")]\n queue -- \"outermost batch ends\" --> notify\n inBatch -- \"no\" --> dispatching{\"already dispatching?\"}\n dispatching -- \"yes\" --> pending[\"mark pending (new round after the current one)\"]\n dispatching -- \"no\" --> dispatch[\"EventTarget.dispatchEvent CustomEvent('change')\"]\n pending -. \"once every listener has run\" .-> dispatch\n\n dispatch --> subscribe[\"subscribe() listeners\"]\n dispatch --> once[\"once() listeners removed after first call\"]\n dispatch --> sourcesChanged\n dispatch --> changed\n\n subgraph computed[\"ComputedSignal (read-only)\"]\n sourcesChanged{\"new source values or in-place mutation?\"}\n sourcesChanged -- \"no, e.g. second source of the same batch\" --> noRecompute([\"skipped\"])\n sourcesChanged -- \"yes\" --> recompute[\"fn(...source values)\"]\n recompute -- \"source mutated in place, same object returned\" --> notify2[\"#notify() of the computed\"]\n recompute -- \"otherwise\" --> equals2[\"equals check of the computed\"]\n end\n\n subgraph effects[\"effect()\"]\n changed{\"new values or in-place mutation?\"}\n changed -- \"yes\" --> rerun[\"previous cleanup, then fn(values)\"]\n changed -- \"no, e.g. second source of the same batch\" --> noRun([\"skipped\"])\n end\n\n subgraph teardown[\"Removing subscriptions\"]\n disposeAll[\"signal.dispose() or end of a using block\"]\n single[\"unsubscribe() or AbortSignal abort\"]\n end\n\n disposeAll -. \"removes all\" .-> subscribe\n disposeAll -. \"removes all\" .-> once\n single -. \"removes one\" .-> subscribe\n```\n\n- **`SSignal`** extends the native `EventTarget`. Every change ends in a single private `#notify()`, which dispatches a `change` event whose `detail` is the current value.\n- **Writes** come from three places: assignments (filtered by `equals`), `mutate()`, and the Map/Set proxy, which only notifies when the collection actually changed. Inside `mutate()`, Map/Set changes are folded into its single event.\n- **`#notify()`** queues the signal while a `batch()` is running, so it notifies once when the batch ends. If a listener changes the signal during a dispatch, the change is delivered in a follow-up round rather than a nested one, so every listener ends on the latest value.\n- **Consumers** all listen to that event: `subscribe()` and `once()` callbacks, `ComputedSignal`, and `effect()`.\n- **`ComputedSignal`** re-runs `fn` when its sources bring new values or were mutated in place, then goes through its own `equals` check, or notifies directly after an in-place mutation. It skips notifications that bring nothing new, so several sources changed in one `batch()`, or both paths of a diamond, cause a single run. Its sources reference it only through a `WeakRef`, but it stays alive while it has listeners. `dispose()` removes its source subscriptions and its own subscribers.\n- **`effect()`** runs the previous cleanup and then `fn` whenever its sources bring new values or were mutated in place, and skips notifications that bring nothing new, so several sources changed in one `batch()` cause a single run. Its dispose function stops it and runs the last cleanup.\n- **Teardown**: `unsubscribe()` or an `AbortSignal` removes one subscription, while `dispose()` (also called at the end of a `using` block) removes every `subscribe()`/`once()` subscription of a signal at once.\n\n## Usage examples\n\n### Plain function / vanilla JS\n\n```ts\nimport SSignal from 'ssignal';\n\nconst counter = new SSignal(0);\n\nconst unsubscribe = counter.subscribe((value) => {\n console.log('counter changed:', value);\n});\n\ncounter.value = 1; // logs: counter changed: 1\ncounter.value = (n) => n + 1; // logs: counter changed: 2\ncounter.value = 2; // no log — same value, no event fired\n\nunsubscribe();\ncounter.value = 99; // no log — already unsubscribed\n```\n\n### React component\n\n```tsx\nimport { useEffect, useState } from 'react';\nimport SSignal from 'ssignal';\n\n// Create signals outside the component so they are shared across the app\nexport const themeSignal = new SSignal<'light' | 'dark'>('light');\nexport const cartSignal = new SSignal(new Map());\n\n// Generic hook to bind any SSignal to local state\nfunction useSignal(signal: SSignal): T {\n const [value, setValue] = useState(signal.value);\n\n useEffect(() => {\n const controller = new AbortController();\n // immediate: true keeps state in sync if the signal changes between\n // render and the effect running\n signal.subscribe((v) => setValue(v), { signal: controller.signal, immediate: true });\n return () => controller.abort();\n }, [signal]);\n\n return value;\n}\n\nexport function ThemeToggle() {\n const theme = useSignal(themeSignal);\n\n return (\n \n );\n}\n\nexport function Cart() {\n const cart = useSignal(cartSignal);\n\n const addItem = (id: string) => {\n cartSignal.value.set(id, (cart.get(id) ?? 0) + 1);\n };\n\n return (\n
\n
Items in cart: {cart.size}
\n \n
\n );\n}\n```\n\n### Express backend\n\n```ts\nimport express from 'express';\nimport SSignal from 'ssignal';\n\nconst app = express();\n\n// Shared application state\nconst connectedClients = new SSignal(0);\nconst featureFlags = new SSignal(new Map([\n ['new-checkout', false],\n ['dark-mode', true],\n]));\n\n// Log every time the client count changes\nconnectedClients.subscribe((count) => {\n console.log(`[${new Date().toISOString()}] Connected clients: ${count}`);\n});\n\napp.use((req, res, next) => {\n connectedClients.value = (n) => n + 1;\n res.on('finish', () => {\n connectedClients.value = (n) => n - 1;\n });\n next();\n});\n\napp.get('/flags', (req, res) => {\n res.json(Object.fromEntries(featureFlags.value));\n});\n\napp.patch('/flags/:name', express.json(), (req, res) => {\n const { name } = req.params;\n featureFlags.value.set(name, req.body.enabled);\n res.sendStatus(204);\n});\n\napp.listen(3000, () => console.log('Server running on port 3000'));\n```\n\n### Reactive Map\n\n```ts\nimport SSignal from 'ssignal';\n\nconst store = new SSignal(new Map());\n\nstore.subscribe((map) => {\n console.log('store changed, size:', map.size);\n});\n\nstore.value.set('a', 1); // logs: store changed, size: 1\nstore.value.set('b', 2); // logs: store changed, size: 2\nstore.value.delete('a'); // logs: store changed, size: 1\nstore.value.clear(); // logs: store changed, size: 0\n```\n\nOnly calls made through `signal.value` are tracked. The signal wraps the collection in a proxy, so if you keep the original `Map`/`Set` you passed in and mutate it directly, no event is fired. `Set` values work the same way with `add()`, `delete()` and `clear()`.\n\n### Arrays and objects\n\nArrays and plain objects are not wrapped, so in-place changes such as `push()` or `obj.x = 1` are not detected on their own. Use `mutate()`: it runs your changes and fires one change event at the end.\n\n```ts\nimport SSignal from 'ssignal';\n\nconst todos = new SSignal([]);\ntodos.subscribe((list) => console.log('todos:', list.length));\n\ntodos.mutate((list) => {\n list.push('write docs');\n list.push('ship it');\n}); // logs once: todos: 2\n\n// Return false to skip the event when nothing changed\ntodos.mutate((list) => {\n if (list.includes('ship it')) return false;\n list.push('ship it');\n}); // no log\n```\n\nAn assigned function is always treated as an updater. To store a function as the value, return it from one: `signal.value = () => handler`.\n\n### Immediate mode\n\n```ts\nimport SSignal from 'ssignal';\n\nconst user = new SSignal({ name: 'Ivan' });\n\n// Fires immediately with current value, then on every change\nuser.subscribe((v) => console.log('user:', v.name), { immediate: true });\n// logs: user: Ivan ← fired synchronously on subscribe\n\nuser.value = { name: 'Junior' };\n// logs: user: Junior\n```\n\n### One-time subscription\n\n```ts\nimport SSignal from 'ssignal';\n\ntype CheckoutState =\n | { status: 'idle' }\n | { status: 'processing'; orderId: string }\n | { status: 'paid'; orderId: string; receiptUrl: string }\n | { status: 'failed'; orderId: string; reason: string };\n\nconst checkout = new SSignal({ status: 'idle' });\n\nfunction openCheckout(orderId: string) {\n const controller = new AbortController();\n\n checkout.value = { status: 'processing', orderId };\n\n // Registered after 'processing', so it reacts to the next state: the payment result\n checkout.once((state) => {\n if (state.status === 'paid') {\n window.location.assign(state.receiptUrl);\n }\n }, { signal: controller.signal });\n\n return {\n close: () => controller.abort(),\n };\n}\n\nconst modal = openCheckout('order_123');\n\ncheckout.value = {\n status: 'paid',\n orderId: 'order_123',\n receiptUrl: '/receipts/order_123',\n}; // redirects once\n\nmodal.close(); // no effect after the one-time listener has already fired\n```\n\nWith `{ immediate: true }`, `once()` runs the callback right away with the current value instead of waiting for a change. That is its only call, so nothing stays registered:\n\n```ts\nconst config = new SSignal({ theme: 'dark' });\n\nconfig.once((c) => applyTheme(c.theme), { immediate: true }); // runs now, once\nconfig.value = { theme: 'light' }; // not called again\n```\n\n### Computed signals\n\n```ts\nimport SSignal, { computed } from 'ssignal';\n\n// Single source\nconst price = new SSignal(100);\nconst withTax = computed(price, (p) => p * 1.21);\n\nwithTax.subscribe((v) => console.log('price with tax:', v), { immediate: true });\n// logs: price with tax: 121\n\nprice.value = 200;\n// logs: price with tax: 242\n\n// Multiple sources\nconst qty = new SSignal(3);\nconst total = computed([price, qty], ([p, q]) => p * q);\n\ntotal.subscribe((v) => console.log('total:', v), { immediate: true }); // logs: total: 600\nqty.value = 5; // logs: total: 1000\n\n// computed signals are read-only\ntotal.value = 0; // throws TypeError\n\n// clean up when no longer needed\ntotal.dispose();\n```\n\nComputed signals skip updates when the derived value is unchanged, except after an in-place mutation of a source (`mutate()` or a Map/Set change). There, a derived object with the same reference still notifies, because it may be what was mutated:\n\n```ts\nconst todos = new SSignal([]);\nconst list = computed(todos, (items) => items);\n\nlist.subscribe((items) => console.log(items.length));\ntodos.mutate((items) => items.push('write docs')); // logs: 1\n```\n\n### Effects\n\n`effect()` runs a side effect right away and again whenever its sources change. Dependencies are listed explicitly, like in `computed()`. Return a function to clean up before the next run and when the effect is disposed:\n\n```ts\nimport SSignal, { effect } from 'ssignal';\n\nconst userId = new SSignal(1);\n\nconst dispose = effect(userId, (id) => {\n const controller = new AbortController();\n fetch(`/api/users/${id}`, { signal: controller.signal })\n .then((res) => res.json())\n .then(render);\n\n return () => controller.abort(); // cancels the previous request\n});\n\nuserId.value = 2; // aborts the request for user 1, fetches user 2\ndispose(); // aborts the pending request, stops following userId\n```\n\nWith several sources, `fn` receives their values as a tuple, and sources changed together inside `batch()` trigger a single run. Pass `{ signal }` to dispose the effect with an `AbortController`.\n\n### Custom equality\n\nBy default an assignment is ignored when `Object.is(prev, next)` is true. Pass `equals` to compare by content instead, for example when you always build new objects:\n\n```ts\nimport SSignal, { computed } from 'ssignal';\n\nconst samePoint = (a: { x: number; y: number }, b: { x: number; y: number }) =>\n a.x === b.x && a.y === b.y;\n\nconst point = new SSignal({ x: 0, y: 0 }, { equals: samePoint });\npoint.subscribe((p) => console.log('moved to', p));\n\npoint.value = { x: 0, y: 0 }; // no log, equal by content\npoint.value = { x: 1, y: 0 }; // logs: moved to { x: 1, y: 0 }\n\n// Also on computed signals\nconst size = new SSignal({ width: 1920, height: 1080 });\nconst orientation = computed(size, (s) => ({ landscape: s.width > s.height }), {\n equals: (a, b) => a.landscape === b.landscape,\n});\n```\n\nReturn `false` to notify on every assignment. `equals` is not consulted by `mutate()` or Map/Set mutations, since the reference does not change.\n\n### Batched updates\n\n```ts\nimport SSignal, { batch, computed } from 'ssignal';\n\nconst price = new SSignal(100);\nconst qty = new SSignal(1);\nconst total = computed([price, qty], ([p, q]) => p * q);\n\ntotal.subscribe((v) => console.log('total:', v));\n\nbatch(() => {\n price.value = 200;\n qty.value = 3;\n}); // logs once: total: 600\n```\n\n`total` is computed once, with both new values, even when `fn` returns a new object each time. Values change immediately inside `batch()`; only the events wait. When a listener changes the signal it is listening to, the new value is delivered in a follow-up round after every listener has seen the current one, so all listeners finish on the latest value.\n\n### Disposing subscriptions\n\n`dispose()` removes every subscription made with `subscribe()` or `once()` in one call, without keeping each unsubscribe function around. The signal can still be read, set and subscribed to afterwards.\n\n```ts\nimport SSignal from 'ssignal';\n\nconst status = new SSignal('idle');\nstatus.subscribe(render);\nstatus.subscribe(log);\n\nstatus.dispose(); // both listeners removed\n```\n\nSignals also implement `Symbol.dispose`, so a `using` declaration cleans them up when the block ends:\n\n```ts\n{\n using status = new SSignal('idle');\n status.subscribe(render);\n} // status.dispose() runs here\n```\n\nListeners added directly with `addEventListener` are not tracked by `dispose()`. `using` needs TypeScript 5.2+ and a runtime with `Symbol.dispose` (Node 18.18+, recent browsers).\n\n### AbortController\n\n```ts\nimport SSignal from 'ssignal';\n\nconst signal = new SSignal(0);\nconst controller = new AbortController();\n\nsignal.subscribe((v) => console.log(v), { signal: controller.signal });\n\nsignal.value = 1; // logs: 1\ncontroller.abort();\nsignal.value = 2; // no log\n```\n\n## Scripts\n\n| Command | Description |\n| :------ | :---------- |\n| `npm run build` | Compile and bundle to `lib/`. |\n| `npm test` | Run unit tests. |\n| `npm run test:coverage` | Run unit tests with coverage report. |\n| `npm run test:performance` | Run performance tests. |\n\n## Performance\n\n`SSignal` handles **200,000 value updates** notifying **10 simultaneous subscribers** in under 500 ms.\n\n\n\n## License\n\nMIT — see [LICENSE](LICENSE).\n\n---\n\nRepository: [github.com/ElJijuna/ssignal](https://github.com/ElJijuna/ssignal)\n","readmeFilename":"README.md"}
![\"SSignal](\"https://raw.githubusercontent.com/ElJijuna/ssignal/main/public/assets/logo.svg\"){kind=logo}
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