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Stream contributors"},"license":"Apache-2.0","homepage":"https://github.com/durable-streams/durable-streams#readme","keywords":["durable-streams","state","protocol","typescript"],"repository":{"url":"git+https://github.com/durable-streams/durable-streams.git","type":"git","directory":"packages/state"},"description":"State change event protocol for Durable Streams","maintainers":[{"name":"dev-npm-publisher-2","email":"dev@electric-sql.com"},{"name":"kylemathews","email":"mathews.kyle@gmail.com"}],"readme":"# @durable-streams/state\n\nBuilding blocks for transmitting structured state over Durable Streams. Use these primitives for any real-time protocol: AI token streams, presence updates, collaborative editing, or database sync.\n\n## Installation\n\n```bash\npnpm add @durable-streams/state\n```\n\nThe package exposes two entry points:\n\n- **`@durable-streams/state`** — the db-free protocol surface: `createStateSchema` and event helpers, `MaterializedState`, and the event types/guards. No extra dependencies.\n- **`@durable-streams/state/db`** — the reactive, TanStack DB-backed layer (`createStreamDB`, live queries, optimistic actions). This entry requires the `@tanstack/db` peer dependency:\n\n```bash\npnpm add @durable-streams/state @tanstack/db\n```\n\n> **Note:** `@tanstack/db` is a peer dependency of the `/db` entry only. Installing it ensures type compatibility when using StreamDB collections with TanStack DB's query utilities like `useLiveQuery` from `@tanstack/react-db`.\n\n## Overview\n\nThis package provides flexible primitives for streaming structured state. You choose how much structure you need:\n\n- **Simple state updates**: Stream JSON payloads and track current values\n- **Typed collections**: Add schemas and primary keys for structured entities\n- **Reactive queries**: Build on TanStack DB for subscriptions and optimistic updates\n\nStream whatever state your protocol requires.\n\n## Quick Start\n\n### Simple State\n\nStream structured JSON and query current values:\n\n```typescript\nimport { MaterializedState } from \"@durable-streams/state\"\n\nconst state = new MaterializedState()\n\n// Apply any structured change\nstate.apply({\n type: \"token\",\n key: \"stream-1\",\n value: { content: \"Hello\", model: \"claude-3\" },\n headers: { operation: \"insert\" },\n})\n\n// Query current state\nconst token = state.get(\"token\", \"stream-1\")\nconst allTokens = state.getType(\"token\")\n```\n\n### Typed Collections\n\nAdd schemas and validation for structured entities:\n\n```typescript\nimport { createStateSchema } from \"@durable-streams/state\"\nimport { createStreamDB } from \"@durable-streams/state/db\"\n\n// Define your schema\nconst schema = createStateSchema({\n users: {\n schema: userSchema, // Standard Schema validator\n type: \"user\", // Event type field\n primaryKey: \"id\", // Primary key field name\n },\n messages: {\n schema: messageSchema,\n type: \"message\",\n primaryKey: \"id\",\n },\n})\n\n// Create a stream-backed database\nconst db = createStreamDB({\n streamOptions: {\n url: \"https://api.example.com/streams/my-stream\",\n contentType: \"application/json\",\n },\n live: \"sse\", // optional: true, \"long-poll\", \"sse\", or false\n state: schema,\n})\n\n// Load initial data\nawait db.preload()\n\n// Reactive queries with useLiveQuery\nimport { useLiveQuery } from \"@tanstack/react-db\" // or solid-db, vue-db\nimport { eq } from \"@tanstack/db\"\n\nconst userQuery = useLiveQuery((q) =>\n q\n .from({ users: db.collections.users })\n .where(({ users }) => eq(users.id, \"123\"))\n .findOne()\n)\n\nconst allUsersQuery = useLiveQuery((q) =>\n q.from({ users: db.collections.users })\n)\n```\n\n## Core Concepts\n\n### State Protocol\n\nThe Durable Streams State Protocol defines a standard format for state change events:\n\n- **Change Events**: `insert`, `update`, `delete` operations on entities\n- **Control Events**: `snapshot-start`, `snapshot-end`, `reset` signals\n- **Entity Types**: Discriminator field that routes events to collections\n- **Primary Keys**: Unique identifiers extracted from entity values\n\nSee [STATE-PROTOCOL.md](./STATE-PROTOCOL.md) for the full specification.\n\n### MaterializedState\n\nSimple in-memory state container for basic use cases:\n\n```typescript\nimport { MaterializedState } from \"@durable-streams/state\"\n\nconst state = new MaterializedState()\n\n// Apply change events\nstate.apply({\n type: \"user\",\n key: \"1\",\n value: { name: \"Kyle\" },\n headers: { operation: \"insert\" },\n})\n\n// Query state\nconst user = state.get(\"user\", \"1\")\nconst allUsers = state.getType(\"user\")\n```\n\n### StreamDB\n\nStream-backed database with TanStack DB collections. Provides reactive queries, subscriptions, and optimistic updates.\n\n## Schema Definition\n\n### createStateSchema()\n\nDefine your application state structure:\n\n```typescript\nconst schema = createStateSchema({\n users: {\n schema: userSchema, // Standard Schema validator\n type: \"user\", // Event type for routing\n primaryKey: \"id\", // Field to use as primary key\n },\n messages: {\n schema: messageSchema,\n type: \"message\",\n primaryKey: \"id\",\n },\n})\n```\n\n### Standard Schema Support\n\nUses [Standard Schema](https://standardschema.dev/) for validation, supporting multiple libraries:\n\n```typescript\n// Zod\nimport { z } from \"zod\"\n\nconst userSchema = z.object({\n id: z.string(),\n name: z.string(),\n email: z.string().email(),\n})\n\n// Valibot\nimport * as v from \"valibot\"\n\nconst userSchema = v.object({\n id: v.string(),\n name: v.string(),\n email: v.pipe(v.string(), v.email()),\n})\n\n// Manual Standard Schema\nconst userSchema = {\n \"~standard\": {\n version: 1,\n vendor: \"my-app\",\n validate: (value) => {\n // Your validation logic\n if (isValid(value)) {\n return { value }\n }\n return { issues: [{ message: \"Invalid user\" }] }\n },\n },\n}\n```\n\n## Event Helpers\n\nSchema provides typed event creation helpers:\n\n```typescript\n// Insert\nconst insertEvent = schema.users.insert({\n value: { id: \"1\", name: \"Kyle\", email: \"kyle@example.com\" },\n key: \"1\", // Optional, defaults to value[primaryKey]\n})\n\n// Update\nconst updateEvent = schema.users.update({\n value: { id: \"1\", name: \"Kyle Mathews\", email: \"kyle@example.com\" },\n oldValue: { id: \"1\", name: \"Kyle\", email: \"kyle@example.com\" }, // Optional\n})\n\n// Delete\nconst deleteEvent = schema.users.delete({\n key: \"1\",\n oldValue: { id: \"1\", name: \"Kyle\", email: \"kyle@example.com\" }, // Optional\n})\n\n// Custom headers\nconst eventWithTxId = schema.users.insert({\n value: { id: \"1\", name: \"Kyle\" },\n headers: {\n txid: crypto.randomUUID(),\n timestamp: new Date().toISOString(),\n },\n})\n```\n\n## StreamDB\n\n### Creating a Database\n\n```typescript\nconst db = createStreamDB({\n streamOptions: {\n url: \"https://api.example.com/streams/my-stream\",\n contentType: \"application/json\",\n // All DurableStream options supported\n headers: { Authorization: \"Bearer token\" },\n batching: true,\n },\n state: schema,\n})\n\n// The stream is created lazily when preload() is called\nawait db.preload()\n```\n\n### Reactive Queries with TanStack DB\n\nStreamDB collections are TanStack DB collections. Use TanStack DB's query builder for filtering, sorting, aggregation, and joins with **differential dataflow** - dramatically faster than JavaScript filtering:\n\n```typescript\nimport { useLiveQuery } from \"@tanstack/[framework]-db\" // react-db, solid-db, etc\nimport { eq, gt, and, count } from \"@tanstack/db\"\n\n// Simple collection access\nconst query = useLiveQuery((q) => q.from({ users: db.collections.users }))\n\n// Filtering with WHERE\nconst activeQuery = useLiveQuery((q) =>\n q\n .from({ users: db.collections.users })\n .where(({ users }) => eq(users.active, true))\n)\n\n// Complex conditions\nconst query = useLiveQuery((q) =>\n q\n .from({ users: db.collections.users })\n .where(({ users }) => and(eq(users.active, true), gt(users.age, 18)))\n)\n\n// Sorting and limiting\nconst topUsersQuery = useLiveQuery((q) =>\n q\n .from({ users: db.collections.users })\n .orderBy(({ users }) => users.lastSeen, \"desc\")\n .limit(10)\n)\n\n// Aggregation with GROUP BY and ordering\nconst langStatsQuery = useLiveQuery((q) => {\n const languageCounts = q\n .from({ events: db.collections.events })\n .groupBy(({ events }) => events.language)\n .select(({ events }) => ({\n language: events.language,\n total: count(events.id),\n }))\n\n return q\n .from({ stats: languageCounts })\n .orderBy(({ stats }) => stats.total, \"desc\")\n})\n\n// Joins across collections\nconst query = useLiveQuery((q) =>\n q\n .from({ messages: db.collections.messages })\n .join({ users: db.collections.users }, ({ messages, users }) =>\n eq(messages.userId, users.id)\n )\n .select(({ messages, users }) => ({\n messageId: messages.id,\n text: messages.text,\n userName: users.name,\n }))\n)\n```\n\n**Why use the query builder?**\n\n- **Differential dataflow**: Incremental updates only recompute affected results\n- **Dramatically faster**: Push filtering/sorting into the DB engine vs JavaScript\n- **Reactive**: Queries automatically update when data changes\n- **Type-safe**: Full TypeScript support with autocomplete\n\n**Framework integration**: See [TanStack DB docs](https://tanstack.com/db) for framework-specific guides:\n\n- [@tanstack/react-db](https://tanstack.com/db/latest/docs/framework/react/overview)\n- [@tanstack/solid-db](https://tanstack.com/db/latest/docs/framework/solid/overview)\n- [@tanstack/vue-db](https://tanstack.com/db/latest/docs/framework/vue/overview)\n\n### Lifecycle Methods\n\n```typescript\n// Load all data until up-to-date\nawait db.preload()\n\n// Stop syncing and cleanup\ndb.close()\n\n// Wait for a transaction to be confirmed\nawait db.utils.awaitTxId(\"txid-uuid\", 5000) // 5 second timeout\n```\n\n## Optimistic Actions\n\nDefine actions with optimistic updates and server confirmation:\n\n```typescript\nconst db = createStreamDB({\n streamOptions: { url: streamUrl, contentType: \"application/json\" },\n state: schema,\n actions: ({ db, stream }) => ({\n addUser: {\n // Optimistic update (runs immediately)\n onMutate: (user) => {\n db.collections.users.insert(user)\n },\n // Server mutation (runs async)\n mutationFn: async (user) => {\n const txid = crypto.randomUUID()\n\n await stream.append(\n JSON.stringify(\n schema.users.insert({\n value: user,\n headers: { txid },\n })\n )\n )\n\n // Wait for confirmation\n await db.utils.awaitTxId(txid)\n },\n },\n\n updateUser: {\n onMutate: ({ id, updates }) => {\n db.collections.users.update(id, (draft) => {\n Object.assign(draft, updates)\n })\n },\n mutationFn: async ({ id, updates }) => {\n const txid = crypto.randomUUID()\n const current = await db.collections.users.get(id)\n\n await stream.append(\n JSON.stringify(\n schema.users.update({\n value: { ...current, ...updates },\n oldValue: current,\n headers: { txid },\n })\n )\n )\n\n await db.utils.awaitTxId(txid)\n },\n },\n }),\n})\n\n// Call actions\nawait db.actions.addUser({ id: \"1\", name: \"Kyle\", email: \"kyle@example.com\" })\nawait db.actions.updateUser({ id: \"1\", updates: { name: \"Kyle Mathews\" } })\n```\n\n## Framework Integration\n\nUse TanStack DB's framework adapters for reactive queries:\n\n### React\n\n```typescript\nimport { useLiveQuery } from '@tanstack/react-db'\nimport { eq } from '@tanstack/db'\n\nfunction UserProfile({ userId }: { userId: string }) {\n const userQuery = useLiveQuery((q) =>\n q.from({ users: db.collections.users })\n .where(({ users }) => eq(users.id, userId))\n .findOne()\n )\n\n if (userQuery.isLoading()) return
Loading...
\n if (!userQuery.data) return
Not found
\n\n return (\n
\n

{userQuery.data.name}

\n

{userQuery.data.email}

\n
\n )\n}\n```\n\nSee [@tanstack/react-db docs](https://tanstack.com/db/latest/docs/framework/react/overview) for more.\n\n### Solid.js\n\n```typescript\nimport { useLiveQuery } from '@tanstack/solid-db'\nimport { eq } from '@tanstack/db'\n\nfunction MessageList() {\n const messagesQuery = useLiveQuery((q) =>\n q.from({ messages: db.collections.messages })\n .orderBy(({ messages }) => messages.timestamp, 'desc')\n .limit(50)\n )\n\n return (\n \n {(message) => }\n \n )\n}\n```\n\nSee [@tanstack/solid-db docs](https://tanstack.com/db/latest/docs/framework/solid/overview) for more.\n\n## Common Patterns\n\n### Key/Value Store\n\n```typescript\nconst schema = createStateSchema({\n config: {\n schema: configSchema,\n type: \"config\",\n primaryKey: \"key\",\n },\n})\n\n// Set value\nawait stream.append(\n JSON.stringify(\n schema.config.insert({\n value: { key: \"theme\", value: \"dark\" },\n })\n )\n)\n\n// Query value reactively\nconst themeQuery = useLiveQuery((q) =>\n q\n .from({ config: db.collections.config })\n .where(({ config }) => eq(config.key, \"theme\"))\n .findOne()\n)\n```\n\n### Presence Tracking\n\n```typescript\nconst schema = createStateSchema({\n presence: {\n schema: presenceSchema,\n type: \"presence\",\n primaryKey: \"userId\",\n },\n})\n\n// Update presence\nawait stream.append(\n JSON.stringify(\n schema.presence.update({\n value: {\n userId: \"kyle\",\n status: \"online\",\n lastSeen: Date.now(),\n },\n })\n )\n)\n\n// Query presence with TanStack DB\nconst presenceQuery = useLiveQuery((q) =>\n q\n .from({ presence: db.collections.presence })\n .where(({ presence }) => eq(presence.status, \"online\"))\n)\n```\n\n### Multi-Type Chat Room\n\n```typescript\nconst schema = createStateSchema({\n users: { schema: userSchema, type: \"user\", primaryKey: \"id\" },\n messages: { schema: messageSchema, type: \"message\", primaryKey: \"id\" },\n reactions: { schema: reactionSchema, type: \"reaction\", primaryKey: \"id\" },\n typing: { schema: typingSchema, type: \"typing\", primaryKey: \"userId\" },\n})\n\n// Different types coexist in the same stream\nawait stream.append(JSON.stringify(schema.users.insert({ value: user })))\nawait stream.append(JSON.stringify(schema.messages.insert({ value: message })))\nawait stream.append(\n JSON.stringify(schema.reactions.insert({ value: reaction }))\n)\n```\n\n## Best Practices\n\n### 1. Use Object Values\n\nStreamDB requires object values (not primitives) for the primary key pattern:\n\n```typescript\n// ❌ Won't work\n{ type: 'count', key: 'views', value: 42 }\n\n// ✅ Works\n{ type: 'count', key: 'views', value: { count: 42 } }\n```\n\n### 2. Always Call close()\n\n```typescript\nuseEffect(() => {\n const db = createStreamDB({ streamOptions, state: schema })\n\n return () => db.close() // Cleanup on unmount\n}, [])\n```\n\n### 3. Validate at Boundaries\n\nUse Standard Schema to validate data at system boundaries:\n\n```typescript\nconst userSchema = z.object({\n id: z.string().uuid(),\n email: z.string().email(),\n age: z.number().min(0).max(150),\n})\n```\n\n### 4. Use Transaction IDs\n\nFor critical operations, always use transaction IDs to ensure confirmation:\n\n```typescript\nconst txid = crypto.randomUUID()\nawait stream.append(\n JSON.stringify(schema.users.insert({ value: user, headers: { txid } }))\n)\nawait db.utils.awaitTxId(txid, 10000) // Wait up to 10 seconds\n```\n\n### 5. Handle Errors Gracefully\n\n```typescript\ntry {\n await db.actions.addUser(user)\n} catch (error) {\n if (error.message.includes(\"Timeout\")) {\n // Handle timeout\n } else {\n // Handle other errors\n }\n}\n```\n\n## API Reference\n\n### Types\n\n```typescript\nexport type Operation = \"insert\" | \"update\" | \"delete\"\n\nexport interface ChangeEvent {\n type: string\n key: string\n value?: T\n old_value?: T\n headers: ChangeHeaders\n}\n\nexport interface ChangeHeaders {\n operation: Operation\n txid?: string\n timestamp?: string\n}\n\nexport interface ControlEvent {\n headers: {\n control: \"snapshot-start\" | \"snapshot-end\" | \"reset\"\n offset?: string\n }\n}\n\nexport type StateEvent = ChangeEvent | ControlEvent\n```\n\n### Functions\n\n```typescript\n// Create a state schema with typed collections and event helpers\nexport function createStateSchema<\n T extends Record,\n>(collections: T): StateSchema\n\n// Create a stream-backed database\nexport async function createStreamDB<\n TDef extends StreamStateDefinition,\n TActions extends Record>,\n>(\n options: CreateStreamDBOptions\n): Promise | StreamDBWithActions>\n```\n\n### Classes\n\n```typescript\nexport class MaterializedState {\n apply(event: ChangeEvent): void\n applyBatch(events: ChangeEvent[]): void\n get(type: string, key: string): T | undefined\n getType(type: string): Map\n clear(): void\n readonly typeCount: number\n readonly types: string[]\n}\n```\n\n## License\n\nApache-2.0\n\n## Learn More\n\n- [STATE-PROTOCOL.md](./STATE-PROTOCOL.md) - Full protocol specification\n- [Durable Streams Protocol](../../PROTOCOL.md) - Base protocol\n- [Standard Schema](https://standardschema.dev/) - Schema validation\n- [TanStack DB](https://tanstack.com/db) - Reactive collections\n","readmeFilename":"README.md"}