This library provides a polyfill/shim for the IndexedDB API, implementing IndexedDB functionality using WebSQL as a backend storage mechanism. It works in both browser environments (leveraging native WebSQL where available) and Node.js (via websql-configurable/SQLite3). The library offers both invasive (automatically setting global indexedDB) and non-invasive (requiring explicit setup) versions. It implements the full IndexedDB specification including databases, object stores, indexes, transactions, and cursors, with proper handling of JavaScript value serialization through a structured cloning algorithm. The project features comprehensive test suites validating W3C compliance and active maintenance with regular updates to address compatibility issues and specification changes.
drawDB is a free, open-source, client-side web application for designing relational database schemas and generating SQL. It provides an interactive ER diagram editor with support for multiple database dialects (MySQL, PostgreSQL, SQLite, MariaDB, MSSQL, Oracle), import/export in SQL, DBML, JSON, Mermaid, and Markdown, and features like auto-arrange, auto-connect foreign keys, schema validation, migration generation, and versioning via GitHub Gists. The architecture is a React single-page application (Vite + Tailwind CSS + Semi UI) with state managed through custom React Contexts and hooks, persistence via IndexedDB (Dexie), and an optional cloud backend through an extension system. It is primarily an application, with no data research or ML components.
This repository is a JavaScript library providing a BroadcastChannel polyfill with leader election capabilities. It enables cross-tab/window/node-process communication through multiple fallback mechanisms (native BroadcastChannel, IndexedDB, localStorage, Node.js sockets, and a simulate method). The library implements leader election algorithms to coordinate multiple instances, ensuring only one acts as leader at a time. It supports diverse environments including old browsers, modern browsers, WebWorkers, Node.js, Deno, and iframes. The architecture centers around a core BroadcastChannel class with pluggable method implementations, a method chooser for fallback selection, and separate leader election utilities. Key entry points are the exported BroadcastChannel class and createLeaderElection function from src/index.js.
This is the OpenIM SDK Core, a cross-platform instant messaging client SDK written in Go. It provides the core messaging functionality—send/receive messages, manage conversations, groups, friends, user profiles, and file uploads—for the OpenIM ecosystem. The SDK communicates with an OpenIM server via HTTP REST and WebSocket long connections, and persists data locally using SQLite (native) or IndexedDB (WebAssembly). It features robust incremental synchronization, a callback-driven architecture for event handling, and extensive support for multiple platforms (iOS, Android, Windows, macOS, Linux, Web). The codebase demonstrates solid engineering practices with generic sync engines, caching utilities, and a comprehensive integration test suite. However, it also contains notable code duplication (dual native/WASM storage implementations), incomplete WASM stubs, some panic-based error handling, and alpha-stage dependencies, which prevent it from being exceptional. Overall, it is a functional, actively maintained SDK with reusable patterns for incremental sync and WebSocket connection management.