Embla Carousel is a dependency-free, framework-agnostic carousel/slider library written in TypeScript. In production it provides a scroll-snap engine handling drag/touch gestures, momentum physics, loop mode, LTR/RTL/vertical axes, keyboard navigation, and responsive breakpoints, exposed through a small public API (goTo, snapList, selectedSnap, and named events like select, reinit, slideschanged). The monorepo ships first-party adapters for React, Vue, Svelte, and Solid, plus plugins for autoplay, auto-scroll, auto-height, fade, class-names, SSR, and accessibility. It also contains a Next.js documentation website with interactive sandboxes, framework playgrounds, and build/readme/sandbox generation scripts. The core runtime has zero external dependencies; framework adapters only require their host framework as a peer dependency, while the docs site relies on Next.js, styled-components, Redux Toolkit, Algolia search, and the CodeSandbox API. Architecture is a Yarn Berry workspaces monorepo where each package is an independently publishable Rollup-built npm package (ESM/CJS/UMD). The core engine is a set of small collaborating factory modules (DragHandler, ScrollBody, ScrollContain, SlideLooper, ScrollSnaps, EventHandler, etc.) composed by an Engine and driven by the top-level EmblaCarousel module. Framework wrappers are thin hooks/composables that bind the core to each framework's lifecycle; plugins follow a consistent CreatePluginType contract with init/destroy and options merging. Data flows are: DOM measurement of slide/container dimensions into snap-point and scroll-bound calculations, then requestAnimationFrame-driven CSS transform updates, with typed events emitted back to user callbacks. Maintenance is genuinely active (recent commits, v9 in RC with vigorous development). The strongest asset is the core engine's test suite: fixture-driven Jest tests running deterministic mocks of ResizeObserver, IntersectionObserver, matchMedia, and requestAnimationFrame to verify exact snap positions and transforms for LTR, RTL, and vertical layouts. The main hygiene issues are committed Next.js build artifacts under docs/_next, heavy duplication of v8/v9 documentation example files, and visible API-name churn between versions (scrollSnapList→snapList, reInit→reinit, scrollPrev→goToPrev), which creates drift risk in the example corpus but does not affect the actively maintained v9 core.
NippleJS is a vanilla virtual joystick library for touch and mouse interfaces, designed for mobile games, remote controls, and interactive web applications. The core library in `packages/nipplejs/` provides a lightweight, dependency-free joystick with three modes (dynamic, semi, static), multitouch support, and extensive event-driven APIs. The architecture is built around a Factory singleton managing Collections, each of which manages multiple Joystick instances. The library is written in TypeScript, with thorough unit tests and Playwright end-to-end tests covering event accuracy, mode behavior, cleanup, and edge cases. The repository also includes a documentation site built with Astro, featuring five interactive game demos that showcase library features, along with a monorepo structure for tools and tests. While the core library is modern and well-tested, some tooling (ESLint 8, Husky v4) and the workspace Yarn version mismatch indicate minor technical drift.