Praxis

Typed, visual-first application logic for Svelte, Node, and the browser.

Praxis is a unified solution for declarative application development. The framework combines typed logic modeling (facts, events, rules, constraints), component generation (Svelte 5), and local-first data persistence (PluresDB). It includes visual tools (CodeCanvas, State-Docs), distributed system support (Unum), optional cloud relay, and a CLI for scaffolding and generation.

The library delivers unified ESM/CJS builds with curated subpath exports (./, ./svelte, ./schema, ./component, ./cloud, ./components), Svelte 5 runes support, and publish-ready packages for npm and JSR.

Install

Node 18+ recommended.

# npm
npm install @plures/praxis

# pnpm
pnpm add @plures/praxis

JSR (Deno):

deno add @plures/praxis
# or via import map pointing to npm:
# {
#   "imports": { "@plures/praxis": "npm:@plures/praxis@^1.1.2" }
# }

Quick start (logic engine)

import {
  createPraxisEngine,
  PraxisRegistry,
  defineFact,
  defineEvent,
  defineRule,
} from '@plures/praxis';

const UserLoggedIn = defineFact<'UserLoggedIn', { userId: string }>('UserLoggedIn');
const Login = defineEvent<'LOGIN', { username: string }>('LOGIN');

const loginRule = defineRule<{ currentUser: string | null }>({
  id: 'auth.login',
  description: 'Authenticate and emit fact',
  impl: (state, events) => {
    const evt = events.find(Login.is);
    if (!evt) return [];
    state.context.currentUser = evt.payload.username;
    return [UserLoggedIn.create({ userId: evt.payload.username })];
  },
});

const registry = new PraxisRegistry();
registry.registerRule(loginRule);

const engine = createPraxisEngine({ initialContext: { currentUser: null }, registry });
engine.step([Login.create({ username: 'alex' })]);

Unified workflow example

See all Praxis integrations working together - from schema definition to persistence, documentation, and distributed communication:

import {
  createPraxisEngine,
  PraxisRegistry,
  defineRule,
  createInMemoryDB,
  createPluresDBAdapter,
  createUnumAdapter,
  createStateDocsGenerator,
  schemaToCanvas,
} from '@plures/praxis';

// 1. Define logic with Praxis engine
const registry = new PraxisRegistry();
registry.registerRule(/* your rules */);
const engine = createPraxisEngine({ initialContext: {}, registry });

// 2. Add PluresDB for local-first persistence
const db = createInMemoryDB();
const pluresAdapter = createPluresDBAdapter({ db, registry });
pluresAdapter.attachEngine(engine);

// 3. Add Unum for distributed communication
const unum = await createUnumAdapter({
  db,
  identity: { name: 'node-1' },
  realtime: true,
});
const channel = await unum.createChannel('app-sync');

// Subscribe to distribute events across nodes
unum.subscribeToEvents(channel.id, (event) => {
  engine.step([event]);
});

// 4. Generate documentation with State-Docs
const docsGenerator = createStateDocsGenerator({
  projectTitle: 'My App',
  target: './docs',
});
const docs = docsGenerator.generateFromModule(registry.module);

// 5. Export schema to CodeCanvas for visual editing
const canvas = schemaToCanvas(mySchema);
// Canvas can be edited visually and converted back to schema

// Now you have:
// ✅ Logic engine running
// ✅ Auto-persisting to PluresDB
// ✅ Distributing events across nodes via Unum
// ✅ Auto-generated documentation
// ✅ Visual schema representation

Svelte integration (runes-ready)

<script lang="ts">
  import { createReactiveEngine, defineEvent, defineRule, PraxisRegistry } from '@plures/praxis/svelte';

  const Increment = defineEvent<'INCREMENT', { amount: number }>('INCREMENT');
  const counterRule = defineRule<{ count: number }>({
    id: 'counter.increment',
    description: 'Add to count',
    impl: (state, events) => {
      const evt = events.find(Increment.is);
      if (evt) state.context.count += evt.payload.amount;
      return [];
    },
  });

  const registry = new PraxisRegistry();
  registry.registerRule(counterRule);

  const engine = createReactiveEngine({ initialContext: { count: 0 }, registry });
  
  // Use Svelte's $derived with the reactive engine state
  const count = $derived(engine.context.count);

  function addOne() {
    engine.step([Increment.create({ amount: 1 })]);
  }
</script>

<button on:click={addOne}>Count is {count}</button>

Framework-agnostic reactive engine

For non-Svelte environments, use the framework-agnostic reactive engine with Proxy-based reactivity:

import { createFrameworkAgnosticReactiveEngine } from '@plures/praxis';

const engine = createFrameworkAgnosticReactiveEngine({
  initialContext: { count: 0 },
});

// Subscribe to state changes
engine.subscribe((state) => {
  console.log('Count:', state.context.count);
});

// Create derived/computed values
const doubled = engine.$derived((state) => state.context.count * 2);
doubled.subscribe((value) => {
  console.log('Doubled:', value);
});

// Apply mutations (batched for performance)
engine.apply((state) => {
  state.context.count += 1;
});

See the reactive counter example for a complete demonstration.

Cloud relay (optional)

import { connectRelay } from '@plures/praxis/cloud';

const relay = await connectRelay('https://my-relay.example.com', {
  appId: 'my-app',
  authToken: process.env.GITHUB_TOKEN,
  autoSync: true,
});

await relay.sync({
  type: 'delta',
  appId: 'my-app',
  clock: {},
  facts: [],
  timestamp: Date.now(),
});

PluresDB integration

import { PluresNode } from 'pluresdb';
import { createPluresDB, createPraxisDBStore } from '@plures/praxis';
import { PraxisRegistry } from '@plures/praxis';

// Initialize the official PluresDB from npm
const pluresdb = new PluresNode({
  config: {
    port: 34567,
    dataDir: './data',
  },
  autoStart: true,
});

// Wrap it with the Praxis adapter
const db = createPluresDB(pluresdb);

// Use with Praxis store for local-first reactive data
const registry = new PraxisRegistry();
const store = createPraxisDBStore(db, registry);

// Or use in-memory database for development/testing
import { createInMemoryDB } from '@plures/praxis';
const devDb = createInMemoryDB();

Note: Praxis now uses the official PluresDB package from NPM, which provides P2P sync, CRDT conflict resolution, SQLite compatibility, and more. The createPluresDB() function wraps PluresDB to provide the PraxisDB interface used by Praxis.

CLI (npx-friendly)

npx praxis --help
npx praxis create app my-app
npx praxis generate --schema src/schemas/app.schema.ts
npx praxis canvas src/schemas/app.schema.ts

Decision Ledger (Behavior Contracts)

Document, validate, and track the evolution of your rules and constraints with explicit behavioral contracts.

import { defineContract, defineRule } from '@plures/praxis';

// Define a contract with explicit behavior, examples, and invariants
const loginContract = defineContract({
  ruleId: 'auth.login',
  behavior: 'Process login events and create user session facts',
  examples: [
    {
      given: 'User provides valid credentials',
      when: 'LOGIN event is received',
      then: 'UserSessionCreated fact is emitted'
    }
  ],
  invariants: ['Session must have unique ID'],
  assumptions: [
    {
      id: 'assume-unique-username',
      statement: 'Usernames are unique across the system',
      confidence: 0.9,
      justification: 'Standard authentication practice',
      impacts: ['spec', 'tests', 'code'],
      status: 'active'
    }
  ]
});

// Attach contract to rule
const loginRule = defineRule({
  id: 'auth.login',
  description: 'Process login events',
  impl: (state, events) => { /* ... */ },
  contract: loginContract
});

Validate contracts in CI/CD:

# Validate all contracts
npx praxis validate --strict

# Generate SARIF for GitHub Actions
npx praxis validate --output sarif > results.sarif

# Reverse engineer contracts from existing code
npx praxis reverse --interactive

Key features:

• ✅ Explicit behavior documentation with Given/When/Then examples
• ✅ Assumption tracking with confidence levels
• ✅ Immutable ledger for change history
• ✅ Build-time validation and CI/CD integration
• ✅ Auto-generation from existing code

See src/decision-ledger/README.md for complete documentation.

Exports map

• @plures/praxis → main engine (ESM/CJS/types)
• @plures/praxis/svelte → Svelte 5 integrations
• @plures/praxis/schema → Schema types
• @plures/praxis/component → Component generator
• @plures/praxis/cloud → Cloud relay APIs
• @plures/praxis/components → TS props for Svelte components (e.g., TerminalNode)
• praxis (bin) → CLI entrypoint

Documentation

• Getting Started
• Framework Guide
• Decision Ledger Guide
• Examples

Decision Ledger

Praxis dogfoods its Decision Ledger to keep rule/constraint behavior explicit and enforceable.

• Behavior Ledger
• Dogfooding Guide

Contributing

PRs and discussions welcome. Please see CONTRIBUTING.md and SECURITY.md. console.log(result.state.facts); // [{ tag: "UserLoggedIn", payload: { userId: "alice" } }] console.log(engine.getContext()); // { currentUser: "alice" }

### With Constraints

```typescript
import { defineConstraint } from '@plures/praxis';

const maxSessionsConstraint = defineConstraint<AuthContext>({
  id: 'auth.maxSessions',
  description: 'Only one user can be logged in at a time',
  impl: (state) => {
    return state.context.currentUser === null || 'User already logged in';
  },
});

registry.registerConstraint(maxSessionsConstraint);

Svelte 5 Integration

Store API (Svelte 4/5 Compatible)

import { createPraxisStore, createDerivedStore } from '@plures/praxis/svelte';

const stateStore = createPraxisStore(engine);
const userStore = createDerivedStore(engine, (ctx) => ctx.currentUser);

// In Svelte component:
// $: currentUser = $userStore;
// <button on:click={() => stateStore.dispatch([Login.create({ username: "alice" })])}>
//   Login
// </button>

Runes API (Svelte 5 Only)

<script lang="ts">
  import { usePraxisEngine } from '@plures/praxis/svelte';
  import { createMyEngine, Login } from './my-engine';

  const engine = createMyEngine();
  const {
    context,      // Reactive context
    dispatch,     // Dispatch events
    undo,         // Undo last action
    redo,         // Redo action
    canUndo,      // Boolean: can undo?
    canRedo,      // Boolean: can redo?
  } = usePraxisEngine(engine, {
    enableHistory: true,    // Enable undo/redo
    maxHistorySize: 50,     // Keep last 50 snapshots
  });
</script>

<div>
  <p>User: {context.currentUser || 'Guest'}</p>

  <button onclick={() => dispatch([Login.create({ username: 'alice' })])}>
    Login
  </button>

  <button onclick={undo} disabled={!canUndo}>
    ⟲ Undo
  </button>

  <button onclick={redo} disabled={!canRedo}>
    ⟳ Redo
  </button>
</div>

See the Advanced Todo Example for a complete demo with:

• Undo/redo functionality
• Time-travel debugging
• Keyboard shortcuts
• Beautiful UI

For comprehensive guides:

• Svelte Integration Guide
• History State Pattern
• Parallel State Pattern

Core Protocol

The language-neutral core protocol forms the foundation of Praxis:

// Facts and Events
interface PraxisFact {
  tag: string;
  payload: unknown;
}

interface PraxisEvent {
  tag: string;
  payload: unknown;
}

// State
interface PraxisState {
  context: unknown;
  facts: PraxisFact[];
  meta?: Record<string, unknown>;
}

// Step Function (the conceptual core)
type PraxisStepFn = (
  state: PraxisState,
  events: PraxisEvent[],
  config: PraxisStepConfig
) => PraxisStepResult;

This protocol is:

• Pure and deterministic (data in → data out)
• No side effects, no global state
• JSON-friendly for cross-language compatibility
• The foundation for all higher-level TypeScript APIs

Framework Architecture

/praxis
├── core/                          # Core framework
│   ├── schema/                    # Schema system
│   │   └── types.ts              # Schema type definitions
│   ├── logic/                     # Logic engine (existing src/core/)
│   │   ├── protocol.ts           # Language-neutral protocol
│   │   ├── rules.ts              # Rules, constraints, and registry
│   │   ├── engine.ts             # LogicEngine implementation
│   │   ├── actors.ts             # Actor system
│   │   └── introspection.ts      # Introspection and visualization
│   ├── component/                 # Component generation
│   │   └── generator.ts          # Svelte component generator
│   ├── pluresdb/                  # PluresDB integration core
│   │   ├── adapter.ts            # Database adapter interface
│   │   ├── store.ts              # Reactive store implementation
│   │   ├── schema-registry.ts    # Schema registry for PluresDB
│   │   └── generator.ts          # PluresDB config generator
│   └── runtime/                   # Runtime abstractions
├── cloud/                         # Praxis Cloud integration
│   ├── auth.ts                   # GitHub OAuth authentication
│   ├── billing.ts                # Tier-based billing
│   ├── provisioning.ts           # Tenant provisioning
│   └── relay/                    # Azure relay service
├── integrations/                  # Ecosystem integrations
│   ├── pluresdb.ts               # PluresDB integration exports
│   ├── svelte.ts                 # Svelte 5 integration
│   ├── unum/                     # Unum identity and channels
│   ├── adp/                      # Architectural Decision Protocol
│   ├── state-docs/               # State-Docs documentation
│   └── canvas/                   # CodeCanvas visual editor
├── components/                    # Svelte components
│   └── TerminalNode.svelte       # Terminal node component
├── cli/                          # Command-line interface
│   ├── index.ts                  # CLI entry point
│   └── commands/                 # Command implementations
├── templates/                     # Project templates
│   ├── basic-app/                # Basic application template
│   └── fullstack-app/            # Full-stack template
├── examples/                      # Example applications
│   ├── offline-chat/             # Offline-first chat demo
│   ├── knowledge-canvas/         # Knowledge management with Canvas
│   ├── distributed-node/         # Self-orchestrating node demo
│   ├── terminal-node/            # Terminal node demo
│   ├── terminal-canvas/          # Terminal + canvas demo
│   ├── cloud-sync/               # Cloud sync demo
│   ├── github-monetization/      # GitHub monetization demo
│   ├── simple-app/               # Simple app demo
│   ├── auth-basic/               # Login/logout example
│   ├── cart/                     # Shopping cart example
│   ├── svelte-counter/           # Svelte integration example
│   └── hero-ecommerce/           # Comprehensive e-commerce demo
└── docs/                         # Framework documentation
    ├── guides/                   # User guides
    │   ├── getting-started.md   # Getting started guide
    │   ├── canvas.md            # CodeCanvas guide
    │   └── orchestration.md     # Orchestration guide
    ├── api/                      # API reference
    └── architecture/             # Architecture documentation

See FRAMEWORK.md for complete architecture documentation.

Examples

The repository includes multiple complete examples:

1. Hero E-Commerce (src/examples/hero-ecommerce)

Comprehensive example demonstrating all Praxis features in a single application:

• Authentication with session management
• Shopping cart with discount rules
• Feature flags for A/B testing
• Loyalty program with points
• Actors for logging and analytics
• Constraints enforcing business rules

npm run build
node dist/examples/hero-ecommerce/index.js

2. Offline-First Chat (examples/offline-chat)

Demonstrates local-first architecture with PluresDB:

• Offline message composition and storage
• Automatic sync when connected
• Message queue for offline messages
• Conflict resolution for concurrent edits
• Real-time features (typing indicators, read receipts)

See examples/offline-chat/README.md

3. Knowledge Canvas (examples/knowledge-canvas)

Showcases CodeCanvas integration for visual knowledge management:

• Visual knowledge graph editing
• Schema-driven content types
• Generated UI components
• State-Docs integration
• Collaborative editing

See examples/knowledge-canvas/README.md

4. Self-Orchestrating Node (examples/distributed-node)

Demonstrates distributed orchestration with DSC/MCP:

• Automatic node discovery
• Self-healing behavior
• State synchronization across nodes
• Health monitoring and auto-scaling
• Failover and recovery

See examples/distributed-node/README.md

5. Terminal Node (examples/terminal-node)

Demonstrates the terminal node feature for command execution:

• Terminal adapter creation and configuration
• Command execution and history tracking
• YAML schema loading with terminal nodes
• PluresDB binding configuration
• Both text and widget input modes

npm run build
node examples/terminal-node/index.js

See examples/terminal-node/README.md and docs/TERMINAL_NODE.md

6. Auth Basic (src/examples/auth-basic)

Login/logout with facts, rules, and constraints.

npm run build
node dist/examples/auth-basic/index.js

7. Cart (src/examples/cart)

Shopping cart with multiple rules, constraints, and complex state management.

npm run build
node dist/examples/cart/index.js

8. Svelte Counter (src/examples/svelte-counter)

Counter example showing Svelte v5 integration with reactive stores.

npm run build
node dist/examples/svelte-counter/index.js

9. Terminal Canvas (examples/terminal-canvas)

Combines terminal nodes with visual canvas features in a Svelte app.

See examples/terminal-canvas/README.md

10. GitHub Monetization (examples/github-monetization)

Example of GitHub-based monetization integration with Praxis Cloud.

See examples/github-monetization/README.md

11. Simple App (examples/simple-app)

A minimal example demonstrating basic Praxis schema usage.

See examples/simple-app/README.md

12. Cloud Sync (examples/cloud-sync)

Demonstrates real-time synchronization with Praxis Cloud relay service.

See examples/cloud-sync/README.md

13. Decision Ledger (examples/decision-ledger)

Demonstrates behavior contracts for rules and constraints with validation and immutable ledger tracking.

Features:

• Contract definition with behavior, examples, and invariants
• Assumption tracking with confidence levels
• Validation and reporting (console, JSON, SARIF)
• Immutable logic ledger for change history
• CLI integration for CI/CD pipelines

npm run build
node examples/decision-ledger/index.js

# Validate contracts
npx praxis validate --registry examples/sample-registry.js

See examples/decision-ledger/README.md

API Reference

Core Types

• PraxisFact, PraxisEvent, PraxisState - Protocol types
• LogicEngine<TContext> - Main engine class
• PraxisRegistry<TContext> - Rule and constraint registry
• Actor<TContext> - Actor interface
• ActorManager<TContext> - Actor lifecycle management

DSL Functions

• defineFact<TTag, TPayload>(tag) - Define a typed fact
• defineEvent<TTag, TPayload>(tag) - Define a typed event
• defineRule<TContext>(options) - Define a rule
• defineConstraint<TContext>(options) - Define a constraint
• defineModule<TContext>(options) - Bundle rules and constraints

Helpers

• findEvent(events, definition) - Find first matching event
• findFact(facts, definition) - Find first matching fact
• filterEvents(events, definition) - Filter events by type
• filterFacts(facts, definition) - Filter facts by type

Introspection & Visualization

Tools for examining and visualizing your Praxis logic:

import { createIntrospector, PRAXIS_PROTOCOL_VERSION } from '@plures/praxis';

const introspector = createIntrospector(registry);

// Get statistics
const stats = introspector.getStats();
console.log(`Rules: ${stats.ruleCount}, Constraints: ${stats.constraintCount}`);

// Generate JSON schema
const schema = introspector.generateSchema(PRAXIS_PROTOCOL_VERSION);

// Generate graph visualization
const graph = introspector.generateGraph();

// Export to Graphviz DOT format
const dot = introspector.exportDOT();
fs.writeFileSync('registry.dot', dot);

// Export to Mermaid format
const mermaid = introspector.exportMermaid();

// Search rules and constraints
const authRules = introspector.searchRules('auth');
const maxConstraints = introspector.searchConstraints('max');

Available methods:

• getStats() - Get registry statistics
• generateSchema(protocolVersion) - Generate JSON schema
• generateGraph() - Generate graph representation
• exportDOT() - Export to Graphviz DOT format
• exportMermaid() - Export to Mermaid diagram format
• getRuleInfo(id) - Get detailed rule information
• getConstraintInfo(id) - Get detailed constraint information
• searchRules(query) - Search rules by text
• searchConstraints(query) - Search constraints by text

Ecosystem Integration

Praxis integrates with the full Plures ecosystem:

PluresDB Integration

Local-first reactive datastore for offline-capable applications. Fully implemented with 32 tests covering all features.

import {
  createInMemoryDB,
  createPraxisDBStore,
  createPluresDBAdapter,
  attachToEngine,
} from '@plures/praxis/pluresdb';

// Create an in-memory database
const db = createInMemoryDB();

// Create a PraxisDB store for facts and events
const store = createPraxisDBStore({ db });

// Or create an adapter to attach to an engine
const adapter = createPluresDBAdapter({
  db,
  registry,
  initialContext: {},
});

// Attach adapter to engine for automatic persistence
adapter.attachEngine(engine);

// Persist facts and events
await adapter.persistFacts([{ tag: 'UserLoggedIn', payload: { userId: 'alice' } }]);
await adapter.persistEvents([{ tag: 'LOGIN', payload: { username: 'alice' } }]);

// Subscribe to changes
adapter.subscribeToEvents((events) => {
  console.log('New events:', events);
});

Features:

• In-memory adapter: Ready-to-use implementation for development and testing
• Reactive store: Watch for changes with callbacks
• Schema registry: Store and retrieve schemas in PluresDB
• Config generator: Generate PluresDB configuration from Praxis schemas
• Engine integration: Automatic fact/event persistence

Status: ✅ Available (src/core/pluresdb/, src/integrations/pluresdb.ts)
Tests: 32 tests covering adapter, store, registry, and engine integration

Unum Integration

Identity and channels for distributed systems. Fully implemented with comprehensive channel and identity management.

import {
  createUnumAdapter,
  attachUnumToEngine,
} from '@plures/praxis';

// Create Unum adapter with identity
const unum = await createUnumAdapter({
  db: pluresDB,
  identity: {
    name: 'my-app-node',
    metadata: { role: 'coordinator' },
  },
  realtime: true,
});

// Create a channel for messaging
const channel = await unum.createChannel('app-events', ['member-1', 'member-2']);

// Broadcast Praxis events to channel
await unum.broadcastEvent(channel.id, {
  tag: 'USER_JOINED',
  payload: { userId: 'alice' },
});

// Subscribe to events from channel
const unsubscribe = unum.subscribeToEvents(channel.id, (event) => {
  console.log('Received event:', event);
  // Feed into local Praxis engine
  engine.step([event]);
});

// Attach to engine for automatic event broadcasting
attachUnumToEngine(engine, unum, channel.id);

Features:

• Identity Management: Create and manage user/node identities
• Channel Communication: Real-time messaging between distributed nodes
• Event Broadcasting: Share Praxis events across channels
• Fact Synchronization: Distribute facts to connected participants
• PluresDB Integration: Persists identities and messages

Status: ✅ Available (src/integrations/unum.ts)
Tests: Comprehensive integration tests
Use Cases: Distributed messaging, identity management, multi-user collaboration

State-Docs Integration

Living documentation generated from Praxis schemas. Fully implemented with Markdown and Mermaid diagram generation.

import {
  createStateDocsGenerator,
  generateDocs,
} from '@plures/praxis';

// Create generator
const generator = createStateDocsGenerator({
  projectTitle: 'My Praxis App',
  target: './docs',
  visualization: {
    format: 'mermaid',
    theme: 'default',
  },
  template: {
    toc: true,
    timestamp: true,
  },
});

// Generate docs from schema
const docs = generator.generateFromSchema(appSchema);

// Or from registry
const registryDocs = generator.generateFromModule(myModule);

// Write generated docs
for (const doc of docs) {
  await writeFile(doc.path, doc.content);
}

// Quick helper
const allDocs = generateDocs(appSchema, {
  projectTitle: 'My App',
  target: './docs',
});

Features:

• Schema Documentation: Auto-generate docs from Praxis schemas
• Mermaid Diagrams: Visual state machine and flow diagrams
• Markdown Output: GitHub-ready documentation
• Model & Component Docs: Detailed API documentation
• Logic Flow Visualization: Event → Rule → Fact diagrams
• Table of Contents: Automatic ToC generation

Status: ✅ Available (src/integrations/state-docs.ts)
Documentation: Auto-generates README, models.md, logic diagrams

CodeCanvas Integration

Visual IDE for schema and logic editing. Fully implemented with schema visualization and canvas export.

import {
  schemaToCanvas,
  canvasToSchema,
  canvasToMermaid,
  createCanvasEditor,
} from '@plures/praxis';

// Convert schema to canvas document
const canvas = schemaToCanvas(mySchema, {
  layout: 'hierarchical',
});

// Export to YAML (Obsidian Canvas compatible)
const yaml = canvasToYaml(canvas);
await writeFile('./schema.canvas.yaml', yaml);

// Export to Mermaid diagram
const mermaid = canvasToMermaid(canvas);

// Create canvas editor instance
const editor = createCanvasEditor({
  schema: mySchema,
  enableFSM: true,
  layout: 'hierarchical',
});

// Add nodes programmatically
editor.addNode({
  type: 'model',
  label: 'User',
  x: 100,
  y: 100,
  width: 150,
  height: 60,
  data: userModel,
});

// Convert back to schema
const updatedSchema = editor.toSchema();

Features:

• Visual Schema Design: Node-based schema editor
• Canvas Export: YAML and Mermaid diagram formats
• Obsidian Compatible: Works with Obsidian Canvas format
• FSM Visualization: State machine and flow diagrams
• Bi-directional Sync: Canvas ↔ Schema round-tripping
• Guardian Validation: Pre-commit lifecycle checks

Status: ✅ Available (src/integrations/code-canvas.ts)
Documentation: docs/guides/canvas.md

Svelte Integration

Svelte v5 integration with reactive stores.

import { createPraxisStore } from '@plures/praxis/svelte';

const stateStore = createPraxisStore(engine);
const userStore = createDerivedStore(engine, (ctx) => ctx.currentUser);

// In Svelte component:
// $: currentUser = $userStore;

Cross-Language Usage

PowerShell

Full PowerShell adapter for using Praxis from PowerShell scripts:

# Import module
Import-Module ./powershell/Praxis.psm1

# Initialize adapter
Initialize-PraxisAdapter -EnginePath "./dist/adapters/cli.js"

# Create state and events
$state = New-PraxisState -Context @{ count = 0 }
$event = New-PraxisEvent -Tag "INCREMENT" -Payload @{}

# Process step
$result = Invoke-PraxisStep -State $state -Events @($event) -ConfigPath "./config.json"

# Use result
Write-Host "Count: $($result.state.context.count)"

See powershell/README.md for complete documentation and examples.

C# (.NET 8+)

Full C# implementation with functional, immutable design:

using Praxis.Core;
using Praxis.Dsl;

// Define facts and events
var UserLoggedIn = PraxisDsl.DefineFact<UserPayload>("UserLoggedIn");
var Login = PraxisDsl.DefineEvent<LoginPayload>("LOGIN");

record UserPayload(string UserId);
record LoginPayload(string Username);

// Define rules
var loginRule = PraxisDsl.DefineRule<AuthContext>(
    id: "auth.login",
    description: "Process login event",
    impl: (state, context, events) =>
    {
        var loginEvent = events.FindEvent(Login);
        if (loginEvent != null)
        {
            var payload = Login.GetPayload(loginEvent);
            return [UserLoggedIn.Create(new UserPayload(payload?.Username ?? "unknown"))];
        }
        return [];
    });

// Create engine
var registry = new PraxisRegistry<AuthContext>();
registry.RegisterRule(loginRule);

var engine = PraxisEngine.Create(new PraxisEngineOptions<AuthContext>
{
    InitialContext = new AuthContext(null),
    Registry = registry
});

// Dispatch events
var result = engine.Step([Login.Create(new LoginPayload("alice"))]);
Console.WriteLine($"Facts: {result.State.Facts.Count}"); // Facts: 1

See csharp/Praxis/README.md for complete documentation.

Cross-Language Support

The core protocol is implemented across multiple languages:

TypeScript (Primary, npm: @plures/praxis)

import { createPraxisEngine, PraxisRegistry } from '@plures/praxis';

const engine = createPraxisEngine({
  initialContext: {},
  registry: new PraxisRegistry(),
});
const result = engine.step(events);

C# (.NET 8+, NuGet: Plures.Praxis)

var engine = PraxisEngine.Create(new PraxisEngineOptions<TContext> { ... });
var result = engine.Step(events);

See csharp/Praxis/README.md for full documentation.

PowerShell (GitHub: Praxis.psm1)

$newState = Invoke-PraxisStep -State $state -Events $events

See powershell/README.md for full documentation.

All implementations share the same protocol version and JSON format for interoperability. See CROSS_LANGUAGE_SYNC.md for details on keeping implementations in sync.

Development

# Install dependencies
npm install

# Build
npm run build

# Run tests
npm test

# Type check
npm run typecheck

Deno Development

# Run with Deno
deno task dev

# Run tests
deno task test

# Lint and format
deno task lint
deno task fmt

For more detailed development information, see CONTRIBUTING.md.

License

MIT License - see LICENSE for details.

Contributing

Contributions are welcome! Please read our Contributing Guide to get started.

• 🐛 Report a bug
• 💡 Request a feature
• 📖 Improve documentation
• 🔒 Report a security issue

Please review our Code of Conduct before participating.

Support

• 📚 Documentation
• 💬 GitHub Discussions
• 🐛 Issue Tracker
• 🌐 Plures Organization

Praxis – Because application logic should be practical, provable, and portable.

Built with ❤️ by the plures team

Overview

Install

Development

Contributing

License