Claude Memory MCP Server

/** * SqlJsDriver - Stub adapter for sql.js (NOT YET FUNCTIONAL) * * This is a placeholder implementation to demonstrate the pluggable driver architecture. * sql.js is an in-memory SQLite implementation compiled to WebAssembly, useful for: * - Browser environments * - Serverless functions with ephemeral filesystems * - Testing with isolated in-memory databases * * TODO: Implement actual sql.js integration when needed * - Install sql.js: npm install sql.js * - Handle async initialization (sql.js Database constructor is async) * - Map sql.js Statement API to PreparedStatement interface * - Handle parameter binding differences * - Implement transaction support */ import type { DbDriver, PreparedStatement, RunResult } from './db-driver.js'; /** * Stub PreparedStatement for sql.js * All methods throw NotImplementedError */ class SqlJsStatementStub<T = unknown> implements PreparedStatement<T> { constructor(private sql: string) {} run(..._params: unknown[]): RunResult { throw new Error( `SqlJsDriver.run() not implemented. SQL: ${this.sql}\n` + 'To use sql.js driver, implement SqlJsDriver according to sql.js API documentation.' ); } get(..._params: unknown[]): T | undefined { throw new Error( `SqlJsDriver.get() not implemented. SQL: ${this.sql}\n` + 'To use sql.js driver, implement SqlJsDriver according to sql.js API documentation.' ); } all(..._params: unknown[]): T[] { throw new Error( `SqlJsDriver.all() not implemented. SQL: ${this.sql}\n` + 'To use sql.js driver, implement SqlJsDriver according to sql.js API documentation.' ); } pluck(): PreparedStatement<T> { throw new Error( `SqlJsDriver.pluck() not implemented. SQL: ${this.sql}\n` + 'To use sql.js driver, implement SqlJsDriver according to sql.js API documentation.' ); } } /** * Stub adapter for sql.js Database * All methods throw NotImplementedError * * When implementing: * 1. Install sql.js: npm install sql.js * 2. Import: import initSqlJs from 'sql.js' * 3. Initialize async: const SQL = await initSqlJs() * 4. Create database: const db = new SQL.Database() * 5. Wrap sql.js Statement API to match PreparedStatement interface * 6. Handle exec() for multi-statement SQL * 7. Implement pragma() using PRAGMA statements * 8. Wrap transactions (sql.js doesn't have explicit transaction API) */ export class SqlJsDriver implements DbDriver { /** * Placeholder constructor * Real implementation would accept sql.js Database instance */ constructor() { // When implementing, accept sql.js Database instance as parameter } prepare<T = unknown>(sql: string): PreparedStatement<T> { // Stub: return throwing statement wrapper return new SqlJsStatementStub<T>(sql); } exec(_sql: string): void { throw new Error( 'SqlJsDriver.exec() not implemented.\n' + 'To use sql.js driver, implement SqlJsDriver according to sql.js API documentation.\n' + 'sql.js supports exec() for multi-statement SQL.' ); } pragma(_pragma: string): unknown { throw new Error( 'SqlJsDriver.pragma() not implemented.\n' + 'To use sql.js driver, implement SqlJsDriver according to sql.js API documentation.\n' + 'sql.js supports PRAGMA statements via exec() or run().' ); } transaction<T>(_fn: () => T): () => T { throw new Error( 'SqlJsDriver.transaction() not implemented.\n' + 'To use sql.js driver, implement SqlJsDriver according to sql.js API documentation.\n' + 'sql.js transactions can be implemented using BEGIN/COMMIT/ROLLBACK statements.' ); } close(): void { throw new Error( 'SqlJsDriver.close() not implemented.\n' + 'To use sql.js driver, implement SqlJsDriver according to sql.js API documentation.\n' + 'sql.js Database has a close() method to free memory.' ); } } /** * Stub factory function for SqlJsDriver * * @throws Error - Always throws, as sql.js is not implemented */ export function createSqlJsDriver(): SqlJsDriver { throw new Error( 'createSqlJsDriver() not implemented.\n' + 'To use sql.js driver:\n' + '1. Install: npm install sql.js\n' + '2. Initialize: const SQL = await initSqlJs()\n' + '3. Create DB: const db = new SQL.Database()\n' + '4. Wrap in SqlJsDriver: return new SqlJsDriver(db)\n\n' + 'sql.js is useful for:\n' + '- Browser environments\n' + '- Serverless functions\n' + '- In-memory testing\n\n' + 'For now, use MEMORY_DB_DRIVER=better-sqlite3 (default)' ); }