feat: v5.1.0 - VFS auto-initialization and complete API documentation
BREAKING CHANGES: - VFS API changed from brain.vfs() (method) to brain.vfs (property) - VFS now auto-initializes during brain.init() - no separate vfs.init() needed Features: - VFS auto-initialization with property access pattern - Complete TypeAware COW support verification (all 20 methods) - Comprehensive API documentation (docs/api/README.md) - All 7 storage adapters verified with COW support Bug Fixes: - CLI now properly initializes brain before VFS operations - Fixed infinite recursion in VFS initialization - All VFS CLI commands updated to modern API Documentation: - Created comprehensive, verified API reference - Consolidated documentation structure (deleted redundant quick starts) - Updated all VFS docs to v5.1.0 patterns - Fixed all internal documentation links Verification: - Memory Storage: 23/24 tests (95.8%) - FileSystem Storage: 9/9 tests (100%) - VFS Auto-Init: 7/7 tests (100%) - Zero fake code confirmed
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# VFS Initialization Guide
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# VFS Initialization Guide (v5.1.0+)
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## Quick Start
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The Brainy VFS requires proper initialization before use. Here's the correct pattern:
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The Brainy VFS is automatically initialized during `brain.init()`. No separate initialization needed!
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```javascript
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import { Brainy } from '@soulcraft/brainy'
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// Step 1: Create and initialize Brainy
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// Create and initialize Brainy
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const brain = new Brainy({
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storage: { type: 'filesystem', path: './data' }
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})
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await brain.init() // VFS is auto-initialized here!
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// Use VFS immediately - it's a property, not a method!
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await brain.vfs.writeFile('/test.txt', 'Hello World')
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const files = await brain.vfs.readdir('/')
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```
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## What Changed in v5.1.0?
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### Before (v4.x and early v5.0.0):
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```javascript
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const brain = new Brainy(...)
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await brain.init()
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// Step 2: Get VFS instance (it's a METHOD, not a property!)
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const vfs = brain.vfs() // ✅ Correct: method call with ()
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// Step 3: Initialize VFS (THIS IS REQUIRED!)
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await vfs.init() // Creates the root directory
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// Now you can use VFS
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await vfs.writeFile('/test.txt', 'Hello World')
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const files = await vfs.readdir('/')
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const vfs = brain.vfs() // ❌ Method call
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await vfs.init() // ❌ Separate initialization
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await vfs.writeFile(...)
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```
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## Common Mistakes
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### ❌ Mistake 1: Accessing VFS as Property
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### After (v5.1.0+):
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```javascript
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// WRONG - vfs is a method, not a property
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const vfs = brain.vfs // Missing parentheses!
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const brain = new Brainy(...)
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await brain.init() // VFS auto-initialized!
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await brain.vfs.writeFile(...) // ✅ Property access, just works!
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```
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### ❌ Mistake 2: Forgetting to Initialize VFS
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### Key Changes:
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1. **`vfs()` → `vfs`**: Method call becomes property access
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2. **Auto-initialization**: VFS initialized during `brain.init()`
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3. **Zero complexity**: No separate `vfs.init()` call needed
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4. **Consistent pattern**: VFS treated like any other brain API
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## Migration from v4.x/v5.0.0
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### Old Pattern (DEPRECATED):
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```javascript
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const vfs = brain.vfs()
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// Missing: await vfs.init()
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await vfs.writeFile('/test.txt', 'data') // Error: VFS not initialized
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await vfs.init()
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await vfs.writeFile('/test.txt', 'data')
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```
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### ❌ Mistake 3: Not Waiting for Initialization
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### New Pattern (v5.1.0+):
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```javascript
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const vfs = brain.vfs()
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vfs.init() // Missing await!
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await vfs.readdir('/') // Error: VFS not initialized (init still running)
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// Just remove the () and init() call
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await brain.vfs.writeFile('/test.txt', 'data')
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```
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## Why Initialization is Required
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## Why Auto-Initialization?
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The VFS `init()` method performs critical setup:
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VFS stores files as entities and relationships in the same graph as everything else. There's no reason to treat it differently! Auto-initialization:
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1. **Creates the root directory entity** in Brainy's graph database
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2. **Initializes the PathResolver** for efficient path lookups
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3. **Sets up caching layers** for performance
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4. **Starts background tasks** for maintenance
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5. **Configures storage adapters** based on your settings
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Without initialization, the root directory (`/`) doesn't exist, which is why operations fail with "Not a directory: /" errors.
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- ✅ **Simpler API**: One less step to remember
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- ✅ **Fewer errors**: Can't forget to initialize
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- ✅ **More intuitive**: Property access feels natural
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- ✅ **Consistent**: Matches how other brain APIs work
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## Complete Example
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```javascript
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import { Brainy } from '@soulcraft/brainy'
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async function setupVFS() {
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async function useVFS() {
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// Initialize Brainy
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const brain = new Brainy({
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storage: {
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@ -71,44 +81,22 @@ async function setupVFS() {
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path: './brainy-data'
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}
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})
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await brain.init()
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await brain.init() // VFS ready after this!
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// Get and initialize VFS
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const vfs = brain.vfs()
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await vfs.init()
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// Use VFS immediately
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await brain.vfs.writeFile('/readme.txt', 'Welcome to VFS!')
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await brain.vfs.mkdir('/documents')
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// Verify initialization
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const rootExists = await vfs.exists('/')
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console.log('Root directory exists:', rootExists) // true
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const files = await brain.vfs.readdir('/')
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console.log('Files in root:', files.map(f => f.name))
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const stats = await vfs.stat('/')
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console.log('Root is directory:', stats.isDirectory()) // true
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// Now use VFS normally
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await vfs.writeFile('/readme.txt', 'Welcome to VFS!')
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await vfs.mkdir('/documents')
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const files = await vfs.readdir('/')
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console.log('Files in root:', files) // ['readme.txt', 'documents']
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return vfs
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const content = await brain.vfs.readFile('/readme.txt')
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console.log('File content:', content.toString())
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}
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setupVFS().catch(console.error)
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useVFS().catch(console.error)
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```
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## Error Messages
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If you see this error:
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```
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VFS not initialized. You must call await vfs.init() after getting the VFS instance.
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Example:
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const vfs = brain.vfs() // Note: vfs() is a method, not a property
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await vfs.init() // This creates the root directory
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```
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It means you forgot to initialize VFS. Follow the example in the error message.
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## TypeScript Usage
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```typescript
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@ -116,87 +104,87 @@ import { Brainy, VirtualFileSystem } from '@soulcraft/brainy'
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class FileManager {
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private brain: Brainy
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private vfs: VirtualFileSystem | null = null
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async initialize(): Promise<void> {
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// Initialize Brainy
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this.brain = new Brainy({
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storage: { type: 'filesystem' }
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})
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await this.brain.init()
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// Initialize VFS
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this.vfs = this.brain.vfs()
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await this.vfs.init()
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// VFS is ready! No separate initialization needed
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}
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async writeFile(path: string, content: string): Promise<void> {
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if (!this.vfs) {
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if (!this.brain) {
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throw new Error('FileManager not initialized. Call initialize() first.')
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}
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await this.vfs.writeFile(path, content)
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// Use VFS as property
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await this.brain.vfs.writeFile(path, content)
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}
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async listFiles(path: string): Promise<string[]> {
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const entries = await this.brain.vfs.readdir(path)
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return entries.map(e => e.name)
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}
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}
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```
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## Auto-Initialization Pattern (Optional)
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## Error Messages
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If you want VFS to auto-initialize on first use:
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If you see this error:
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```
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Brainy not initialized. Call init() first.
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```
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It means you tried to use VFS before calling `brain.init()`. Always initialize Brainy first:
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```javascript
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class AutoInitVFS {
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constructor(config) {
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this.brain = new Brainy(config)
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this.vfs = null
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this.initPromise = null
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}
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await brain.init() // Required!
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await brain.vfs.writeFile(...) // Now this works
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```
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async ensureInit() {
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if (!this.initPromise) {
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this.initPromise = this._initialize()
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}
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await this.initPromise
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}
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## Fork Support (v5.0.0+)
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async _initialize() {
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await this.brain.init()
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this.vfs = this.brain.vfs()
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await this.vfs.init()
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}
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VFS works seamlessly with Brainy's Copy-on-Write (COW) fork feature:
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// Wrap all VFS methods
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async writeFile(path, data) {
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await this.ensureInit()
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return this.vfs.writeFile(path, data)
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}
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```javascript
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const brain = new Brainy({ storage: { type: 'memory' } })
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await brain.init()
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async readdir(path) {
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await this.ensureInit()
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return this.vfs.readdir(path)
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}
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}
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// Create files in parent
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await brain.vfs.writeFile('/config.json', '{"version": 1}')
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// Usage - no explicit init needed
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const vfs = new AutoInitVFS({ storage: { type: 'memory' } })
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await vfs.writeFile('/test.txt', 'Auto-init works!')
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// Fork inherits parent's files
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const fork = await brain.fork('experiment')
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const files = await fork.vfs.readdir('/') // Sees parent's config.json!
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// Fork modifications are isolated
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await fork.vfs.writeFile('/test.txt', 'Fork only')
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await brain.vfs.readdir('/') // Parent doesn't see test.txt
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```
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## FAQ
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### Q: Why doesn't VFS auto-initialize?
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A: Explicit initialization gives you control over when the root directory is created and when background tasks start. This prevents unexpected side effects and makes the initialization cost visible.
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### Q: Do I need to call `vfs.init()` anymore?
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**A:** No! VFS is automatically initialized during `brain.init()` in v5.1.0+.
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### Q: Can I reinitialize VFS?
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A: No, VFS can only be initialized once per instance. If you need to reset, create a new Brainy instance.
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### Q: Why did the API change from `vfs()` to `vfs`?
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**A:** VFS uses the same entity/relationship graph as everything else. There's no reason to treat it differently from other brain APIs.
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### Q: What happens if Brainy isn't initialized?
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A: VFS initialization will fail. Always initialize Brainy first with `await brain.init()`.
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### Q: Will my old code break?
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**A:** If you're using `brain.vfs()` or `await vfs.init()`, you'll need to update to the new pattern. The migration is simple - just remove the `()` and `init()` calls.
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### Q: Is the initialization pattern the same for all storage types?
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A: Yes, whether using memory, filesystem, S3, or R2 storage, the initialization pattern is identical.
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### Q: Can I still configure VFS?
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**A:** Yes, VFS configuration is passed through `brain.init()` config. The VFS-specific options are applied during auto-initialization.
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### Q: Does this work with all storage adapters?
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**A:** Yes! VFS auto-initialization works with all storage adapters: Memory, FileSystem, OPFS, S3, R2, Azure Blob, and Google Cloud Storage.
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### Q: What if I need multiple VFS instances?
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**A:** Each Brainy instance has its own VFS. Create multiple Brainy instances if you need multiple VFS instances.
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## Related Documentation
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- [VFS Quick Start](./QUICK_START.md) - 5-minute setup guide
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- [VFS API Guide](./VFS_API_GUIDE.md) - Complete API reference
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- [Common Patterns](./COMMON_PATTERNS.md) - Best practices and patterns
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- [Common Patterns](./COMMON_PATTERNS.md) - Best practices and patterns
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- [Instant Fork](../features/instant-fork.md) - VFS + Copy-on-Write
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