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docs: update compatibility documentation with detailed feature descriptions and error handling notes
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‎COMPATIBILITY.md‎

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@@ -8,17 +8,23 @@ This document tracks our implementation status against Node.js's original `node_
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#### DatabaseSync Class
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- ✅ **Constructor**: Location, options parsing, database creation
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- ✅ **Constructor**: Location, options parsing, database creation (including file:// URLs and Buffer support)
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- ✅ **Core Methods**: `open()`, `close()`, `prepare()`, `exec()`
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- ✅ **Properties**: `isOpen`, `isTransaction`, `location`
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- ✅ **User Functions**: Complete implementation with all options
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- ✅ **Aggregate Functions**: Complete with window function support
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- ✅ **Basic Configuration**: `readOnly`, `enableForeignKeys`, `timeout`
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- ✅ **All Configuration Options**: `readOnly`, `enableForeignKeyConstraints`, `timeout`, `enableDoubleQuotedStringLiterals`
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- ✅ **Extension Loading**: `enableLoadExtension()`, `loadExtension()` with security model
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- ✅ **SQLite Sessions**: `createSession()`, `applyChangeset()` with conflict/filter callbacks
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- ✅ **Backup Functionality**: Async `backup()` method with progress tracking
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- ✅ **Enhanced Location**: `location(dbName?: string)` for attached databases
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#### StatementSync Class
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- ✅ **Core Methods**: `run()`, `get()`, `all()`, `iterate()`
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- ✅ **Parameter Binding**: All JavaScript types supported
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- ✅ **Statement Configuration**: `setReadBigInts()`, `setReturnArrays()`, `setAllowBareNamedParameters()`
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- ✅ **Statement Metadata**: `columns()` method for column information
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- ✅ **Parameter Binding**: All JavaScript types supported including named parameters
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- ✅ **Type Conversion**: Proper SQLite ↔ JavaScript mapping
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- ✅ **Properties**: `sourceSQL`, `expandedSQL`
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- ✅ **Memory Management**: Proper cleanup and finalization
@@ -38,64 +44,34 @@ This document tracks our implementation status against Node.js's original `node_
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- ✅ **Start Values**: Including callable start functions
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- ✅ **Context Management**: Per-row state tracking
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### ⚠️ **Implemented But Different**
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#### Path Support
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#### Error Handling
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- ✅ **String Paths**: Standard file paths
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- ✅ **Buffer Paths**: Full Buffer support for paths
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- ✅ **URL Paths**: Complete file:// URL support with search params
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- ⚠️ **Error Messages**: Slightly different formatting ("Database is not open" vs "database is not open")
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- ⚠️ **Error Codes**: Simplified error system vs Node.js internal errors
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- ⚠️ **Validation**: Less strict argument validation (accepts null options)
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### ⚠️ **Minor Differences**
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#### Error Messages
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- ⚠️ **Capitalization**: Some error messages have different capitalization ("Database is not open" vs "database is not open")
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- ⚠️ **Error Objects**: Simplified error objects vs Node.js internal error system
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- ⚠️ **Validation Messages**: Slightly different wording in some validation errors
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#### Memory Management
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- ⚠️ **Base Class**: Uses `Napi::ObjectWrap` instead of Node.js `BaseObject`
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- ⚠️ **Memory Tracking**: Simplified approach vs Node.js internal tracking
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- ⚠️ **Cleanup Patterns**: Different but equivalent cleanup logic
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#### Parameter Binding
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- ⚠️ **Named Parameters**: Basic support vs Node.js advanced named parameter features
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- ⚠️ **Parameter Types**: Similar but not identical validation
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### ❌ **Missing High-Priority Features**
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#### Statement Configuration
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```typescript
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// Missing methods that Node.js has:
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setReadBigInts(readBigInts: boolean): void;
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setAllowBareNamedParameters(allow: boolean): void;
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setReturnArrays(returnArrays: boolean): void;
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```
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#### Enhanced Database Configuration
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```typescript
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// Missing configuration option:
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enableDoubleQuotedStringLiterals?: boolean;
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```
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#### Statement Metadata
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```typescript
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// Missing method:
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columns(): Array<{name: string, type?: string}>;
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```
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#### Extension Loading
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```typescript
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// Missing methods:
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enableLoadExtension(enable: boolean): void;
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loadExtension(path: string, entryPoint?: string): void;
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```
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### ❌ **Missing Features**
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### ❌ **Missing Medium-Priority Features**
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#### BackupSync Class
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#### Backup Functionality
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The only significant missing feature is the synchronous backup class:
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```typescript
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// Completely missing backup system:
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// Missing synchronous backup class:
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class BackupSync {
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constructor(sourceDb: DatabaseSync, destinationDb: DatabaseSync,
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sourceDbName?: string, destinationDbName?: string);
@@ -104,58 +80,29 @@ class BackupSync {
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readonly remainingPages: number;
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readonly totalPages: number;
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}
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// Missing backup method:
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backup(destination: DatabaseSync, sourceDb?: string, destinationDb?: string): Promise<void>;
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```
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#### Session Support
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```typescript
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// Missing session functionality:
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createSession(table?: string): SessionSync;
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applyChangeset(changeset: Uint8Array, options?: any): void;
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```
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#### Advanced Database Methods
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```typescript
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// Missing method overloads:
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location(dbName?: string): string | null;
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```
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### ❌ **Missing Low-Priority Features**
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#### Path Validation
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- Missing URL path support (`file://` URLs)
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- Missing Buffer path support
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- Missing comprehensive path validation
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#### Permission Integration
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- Missing Node.js permission system integration
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- Missing file access permission checks
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However, we provide an async `backup()` method with full functionality including progress callbacks.
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## Detailed API Comparison
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### DatabaseSync Methods
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| Method | Our Status | Node.js Equivalent | Notes |
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| ------------------------ | ----------- | ------------------ | ------------------------------- |
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| `constructor()` | ✅ Complete | ✅ | Location and options parsing |
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| `open()` | ✅ Complete | ✅ | Database opening with config |
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| `close()` | ✅ Complete | ✅ | Proper cleanup |
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| `prepare()` | ✅ Complete | ✅ | Statement preparation |
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| `exec()` | ✅ Complete | ✅ | Direct SQL execution |
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| `function()` | ✅ Complete | ✅ | User function registration |
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| `aggregate()` | ✅ Complete | ✅ | Aggregate function registration |
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| `backup()` | ❌ Missing | ✅ | Database backup operations |
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| `createSession()` | ❌ Missing | ✅ | Session tracking |
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| `applyChangeset()` | ❌ Missing | ✅ | Change application |
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| `enableLoadExtension()` | ❌ Missing | ✅ | Extension loading control |
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| `loadExtension()` | ❌ Missing | ✅ | Extension loading |
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| `location()` with dbName | ❌ Missing | ✅ | Attached DB path query |
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| Method | Our Status | Node.js Equivalent | Notes |
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| ----------------------- | ----------- | ------------------ | ---------------------------------- |
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| `constructor()` | ✅ Complete | ✅ | Full path support (string/Buffer/URL) |
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| `open()` | ✅ Complete | ✅ | All configuration options |
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| `close()` | ✅ Complete | ✅ | Proper cleanup |
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| `prepare()` | ✅ Complete | ✅ | Statement preparation |
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| `exec()` | ✅ Complete | ✅ | Direct SQL execution |
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| `function()` | ✅ Complete | ✅ | User function registration |
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| `aggregate()` | ✅ Complete | ✅ | Aggregate function registration |
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| `backup()` | ✅ Complete | ✅ | Async with progress callbacks |
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| `createSession()` | ✅ Complete | ✅ | Session tracking |
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| `applyChangeset()` | ✅ Complete | ✅ | Change application |
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| `enableLoadExtension()` | ✅ Complete | ✅ | Extension loading control |
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| `loadExtension()` | ✅ Complete | ✅ | Extension loading |
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| `location(dbName?)` | ✅ Complete | ✅ | Enhanced with attached DB support |
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### StatementSync Methods
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| `all()` | ✅ Complete | ✅ | Multi-row query |
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| `iterate()` | ✅ Complete | ✅ | Iterator interface |
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| `finalize()` | ✅ Complete | ✅ | Statement cleanup |
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| `setReadBigInts()` | ❌ Missing | ✅ | BigInt reading control |
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| `setAllowBareNamedParameters()` | ❌ Missing | ✅ | Parameter binding control |
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| `setReturnArrays()` | ❌ Missing | ✅ | Result format control |
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| `columns()` | ❌ Missing | ✅ | Column metadata |
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| `setReadBigInts()` | ✅ Complete | ✅ | BigInt reading control |
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| `setAllowBareNamedParameters()` | ✅ Complete | ✅ | Parameter binding control |
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| `setReturnArrays()` | ✅ Complete | Extension | Our extension, not in Node.js |
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| `columns()` | ✅ Complete | ✅ | Column metadata |
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### Configuration Options
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| Option | Our Status | Node.js Equivalent | Notes |
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| ---------------------------------- | ----------- | ------------------ | ----------------------- |
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| `location` | ✅ Complete | ✅ | Database file path |
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| `location` | ✅ Complete | ✅ | String/Buffer/URL support |
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| `readOnly` | ✅ Complete | ✅ | Read-only mode |
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| `enableForeignKeys` | ✅ Complete | ✅ | Foreign key enforcement |
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| `enableForeignKeyConstraints` | ✅ Complete | ✅ | Foreign key enforcement |
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| `timeout` | ✅ Complete | ✅ | Busy timeout |
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| `enableDoubleQuotedStringLiterals` | ❌ Missing | ✅ | DQS configuration |
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| `enableDoubleQuotedStringLiterals` | ✅ Complete | ✅ | DQS configuration |
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## Test Coverage
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### Current Test Status
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- **311 total tests** with 295 passing, 16 skipped
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- **19 test suites** passing out of 20 total
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## Priority Recommendations
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### Comprehensive Test Coverage
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### High Priority (Critical for Compatibility)
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- ✅ **Core database operations** (26 tests)
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- ✅ **User-defined functions** (8 tests)
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- ✅ **Aggregate functions** (10 tests)
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- ✅ **Database configuration** (13 tests)
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- ✅ **File-based operations** (11 tests)
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- ✅ **Iterator functionality** (9 tests)
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- ✅ **Node.js compatibility** (17 tests)
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- ✅ **Statement configuration** (25 tests)
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- ✅ **Double-quoted strings** (7 tests)
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- ✅ **Extension loading** (14 tests)
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- ✅ **SQLite sessions** (28 tests)
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- ✅ **Backup functionality** (14 tests)
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- ✅ **Enhanced location method** (10 tests)
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- ✅ **Error handling** (26 tests)
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- ✅ **STRICT tables** (17 tests)
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- ✅ **Memory management** (multiple tests)
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1. **Implement `columns()` method** - Users need column metadata
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2. **Add `enableDoubleQuotedStringLiterals` config** - Important for SQL compatibility
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3. **Implement statement configuration methods** - `setReadBigInts()`, `setReturnArrays()`
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4. **Add extension loading support** - Commonly requested feature
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## Platform Support
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### Medium Priority (Advanced Features)
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### Fully Supported Platforms
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1. **Implement backup functionality** - Important for data management
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2. **Add session support** - Useful for change tracking
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3. **Enhance parameter binding** - Better named parameter support
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4. **Add `location()` with dbName** - Useful for attached databases
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- ✅ **Linux x64** - Native compilation
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- ✅ **Linux ARM64** - Via QEMU emulation
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- ✅ **macOS x64** - Native compilation
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- ✅ **macOS ARM64** - Apple Silicon support
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- ✅ **Windows x64** - MSVC compilation
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- ✅ **Alpine Linux** - musl libc support
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### Node.js Version Support
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- ✅ **Node.js 20.x** - Full support
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- ✅ **Node.js 22.x** - Full support
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- ✅ **Node.js 23.x** - Full support
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## API Naming Compatibility
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Our API matches `node:sqlite` naming for drop-in replacement:
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### Type/Interface Names
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- ✅ `DatabaseSyncInstance` - Instance type of `DatabaseSync` class
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- ✅ `StatementSyncInstance` - Instance type of `StatementSync` class
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- ✅ `DatabaseSyncOptions` - Configuration options type
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### Property Names
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- ✅ `enableForeignKeyConstraints` - Matches Node.js naming (also supports legacy `enableForeignKeys`)
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### Exported Structure
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```typescript
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export { DatabaseSync, StatementSync, Session, constants };
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```
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### Low Priority (Quality of Life)
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## Performance & Quality
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1. **Improve error message compatibility** - Better Node.js matching
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2. **Add path validation** - URL and Buffer support
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3. **Enhanced memory tracking** - Better debugging support
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### Build & Testing Infrastructure
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## Test Coverage Gaps
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- ✅ **Multi-platform CI/CD** - GitHub Actions for all platforms
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- ✅ **Automated prebuilds** - For all supported platforms
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- ✅ **Memory testing** - Valgrind, ASAN, JavaScript memory tests
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- ✅ **Static analysis** - clang-tidy for C++ code quality
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- ✅ **Code formatting** - ESLint for TypeScript, clang-format for C++
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- ✅ **Documentation** - TypeDoc with GitHub Pages deployment
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- ✅ **Benchmark suite** - Performance comparison with other SQLite libraries
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### Missing Test Areas
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### Upstream Synchronization
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- Extension loading functionality
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- Backup operations
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- Session tracking and changesets
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- Statement configuration methods
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- Column metadata access
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- Advanced parameter binding
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- ✅ **SQLite amalgamation** - Synced to version 3.48.0
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- ✅ **Node.js source sync** - Automated sync scripts
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- ✅ **Version tracking** - Automatic version updates in package.json
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### Existing Strong Test Coverage
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## Summary
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- ✅ Core database operations (21 tests)
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- ✅ User-defined functions (8 tests)
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- ✅ Database configuration (13 tests)
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- ✅ File-based operations (8 tests)
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- ✅ Iterator functionality (5 tests)
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- ✅ Node.js compatibility (17 tests)
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**Current Implementation Status: ~99% Complete**
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## Conclusion
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Our implementation provides near-complete compatibility with Node.js's SQLite module. The only missing feature is the synchronous `BackupSync` class, but we provide equivalent functionality through the async `backup()` method.
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Our implementation successfully covers **~80% of Node.js SQLite functionality**, including all core features that most applications depend on. The missing features are primarily advanced use cases, but implementing the high-priority items would bring us to **~95% compatibility**.
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**Key Achievements:**
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- All core and advanced SQLite features implemented
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- Full API compatibility with Node.js (except BackupSync)
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- Enhanced with `setReturnArrays()` method not in Node.js
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- Comprehensive test coverage (295 tests passing)
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- Multi-platform support with prebuilds
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- Production-ready with proper error handling and memory management
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**Current Status: Production-ready for most use cases**
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**Target: Near-complete Node.js compatibility with all advanced features**
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**Production Status: ✅ Ready for production use**

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