Anime.js v4 is a modular, high-performance JavaScript animation engine targeting the browser. It is distributed as a library (not an application or service) with a comprehensive public API exposed via ES modules, CJS, and UMD bundles. The architecture is a single runtime engine (a Clock-driven RAF loop) that owns a linked list of tickable objects—timers, animations, and timelines—each of which can contain child tweens. The engine is responsible for framerate control, delta-time computation, and driving the render pipeline every frame. The core data flow is: user calls (e.g., animate(), createTimeline(), createTimer()) construct tickable objects, register targets, decompose values, and attach them to the engine via addChild(). On each animation frame, the engine iterates its linked list, computes each tickable's local time (accounting for speed, offset, and delays), and calls tick() which in turn calls render() to interpolate tweens and apply values to targets through a setter pipeline. The setter pipeline resolves property names through a layered system: registered target adapters (for three.js Object3D, materials, instances, and TSL uniforms), property resolvers (for Color/Vector decomposition, Euler angles, and material properties), and finally direct property writes on the target object. Key modules include: engine/ (the main loop and global tick), animation/ (JSAnimation, tween composition, additive blending), timeline/ (Timeline with labels, sync, and position parsing), timer/ (standalone clock-driven tickable), easings/ (cubic-bezier, spring solver, steps, irregular, linear, and named eases), utils/ (stagger, random, time helpers, chainable, target get/set/remove), draggable/ (pointer-based dragging with spring physics), scope/ (responsive, revertible animation contexts with media queries), events/ (scroll-linked animations), layout/ (FLIP-based auto-layout transitions), text/ (splitText and scrambleText), svg/ (morphTo, createDrawable, createMotionPath), waapi/ (Web Animations API wrapper), and adapters/ (extensible adapter registry with a full three.js integration). External runtime dependencies are minimal: the library itself has zero runtime dependencies. The three.js adapter is an optional peer dependency. Dev dependencies include Rollup for bundling, TypeScript for type generation, Mocha/Chai for testing, and three.js for the adapter tests. The codebase demonstrates strong software engineering practices: a clean class hierarchy (Clock -> Engine/Timer/Animation/Timeline), a sophisticated tween composition system (replace/none/blend), additive animation support, a custom spring solver adapted from WebKit, frame-rate-independent damping, and a well-designed adapter system that makes the engine extensible to arbitrary object graphs.
GSAP (GreenSock Animation Platform) is a mature, high-performance JavaScript animation library designed for creating complex animations in web applications. It features a plugin-based architecture where the core tweening engine is extended by plugins for specific animation types such as CSS, scroll-based motions, SVG morphing, and physics effects. The library is framework-agnostic and supports animation of CSS properties, SVG attributes, canvas objects, and JavaScript objects. The source code reveals a well-structured codebase with clear separation of concerns. Core animation logic resides in gsap-core.js, while utilities (matrix operations, string handling, path parsing, velocity tracking) are isolated in the utils directory. Plugins follow a consistent registration pattern and demonstrate attention to cross-browser compatibility, performance optimization (including requestAnimationFrame usage and tree shaking protection), and modular design. The library is actively maintained with recent updates and extensive TypeScript support.
Clawd on Desk is a cross-platform Electron desktop companion application that visually reflects the real-time activity of AI coding agents (Claude Code, Codex, Cursor, Gemini, Kimi, Qwen, and 18+ others) as an animated pet on the user's screen. The application integrates with each agent via hook scripts that intercept lifecycle events (thinking, working, idle, error, etc.) and post state to a local HTTP server, which drives the pet's animations, permission bubbles, and system tray presence. It provides a sophisticated permission management system with local bubble UI, remote approval via Telegram/Feishu/Slack, and session automation policies, all while supporting custom themes, Discord Rich Presence, and a mobile companion PWA. The architecture is an Electron main process orchestrating multiple renderer windows (pet, bubble, settings, dashboard, quota ring, session HUD) with IPC bridges. The state machine resolves session states from multiple agents into a single dominant visual state using priority-based resolution. The codebase is modular with factory functions, dependency injection, and pure math modules that are testable in isolation. It includes a comprehensive theme system with SVG/GIF/APNG support, a doctor/health check system, remote SSH deployment of hooks, and a recap feature for local activity tracking. The project has over 1000 test files and extensive CI/CD pipelines for Windows, macOS, and Linux packaging.
This is a React-based single-page application that converts Excalidraw drawings into animated SVGs. It provides both an editing mode (using the Excalidraw library) where users can configure animation order and duration per element, and an animate mode where the resulting SVG is rendered with playback controls (play/pause/step/reset). The core animation logic is implemented using SMIL (SVG animations), patching SVG elements with `animate`, `animateMotion`, and `textPath` elements. Users can load drawings from files, libraries, or shareable URLs. The app also exports to SVG and WebM (via screen capture). It is published as an npm package for programmatic use, exposing `animateSvg`, `getBeginTimeList`, and export utilities. The codebase is modern (React 19, TypeScript, Vite) and includes comprehensive testing with Playwright. Architecturally, it operates as a client-side SPA with two views (edit and animate) and a toolbar for loading/playback/export.