Add pick-ui-library skill with project constraints
Copied from emilkowalski/skills (MIT, commit 715c180), invoked manually only. Appended a project section: shadcn base-nova on Base UI, DS-2 rules, one animated element per page, no new deps without approval. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Claude Opus 5.5
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name: pick-ui-library
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description: Pick the right library for a given frontend task from a curated, opinionated list — numbers, OTP inputs, charts, command menus, virtualization, drag and drop, toasts, state, styling, and more. Only runs when explicitly invoked; it does not trigger on its own.
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disable-model-invocation: true
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---
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# Picking The Right Library
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## Initial Response
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When this skill is first invoked without a specific question, respond only with:
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> I'm ready to pick the right library for your task, my picks come from Emil Kowalski's curated list.
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Do not provide any other information until the user asks a question.
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A lookup skill. When invoked with a task ("I need toasts", "what should I use for drag and drop?"), match the task to the curated list below and recommend the library. These are deliberate, taste-driven picks — don't substitute alternatives outside this list unless the user asks for one or the task genuinely isn't covered.
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## How to use this
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1. **Identify the task**, not the library the user named. "I need to show a dropdown" is a UI-primitives task (base-ui), even if they asked about something else.
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2. **Check what's already installed.** Look at `package.json` first. If the project already uses a listed library, use it. If it uses a competitor (e.g. react-window instead of Virtuoso), flag the recommendation but don't churn the dependency without being asked.
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3. **Recommend one library**, state what it's for in one sentence, and install/wire it up if that's part of the request. Don't present a menu of options when the list has a clear answer.
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4. If the task isn't covered by the list, say so explicitly and recommend from your own knowledge — but be clear you've left the curated list.
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## The list
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### UI components & primitives
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| Task | Library |
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| --- | --- |
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| Unstyled, accessible UI components (dialogs, popovers, menus, selects…) | [base-ui](https://base-ui.com) |
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| Command menus (⌘K palettes) | [cmdk](https://cmdk.paco.me) |
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| Toasts / notifications | [Sonner](https://sonner.emilkowal.ski) |
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| One-time password / verification code inputs | [input-otp](https://input-otp.rodz.dev) |
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| Customizable GUIs / control panels | [Leva](https://github.com/pmndrs/leva) — [dialkit](https://joshpuckett.me/dialkit) is an alternative |
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### Motion & visuals
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| Task | Library |
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| --- | --- |
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| General-purpose animation (springs, layout animations, enter/exit) | [motion](https://motion.dev) (Framer Motion) |
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| Animating numbers (counters, prices, stats) | [NumberFlow](https://number-flow.barvian.me) |
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| Animated text components | [torph](https://torph.lochie.me/) |
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| 3D globes | [Cobe](https://cobe.vercel.app) |
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| Dynamic OG images (HTML/CSS → SVG/PNG) | [Satori](https://github.com/vercel/satori) |
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| Syntax highlighting | [shiki](https://shiki.style) |
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Reach for motion when you need springs, layout animations, exit animations, or gesture-driven values. A simple hover or fade doesn't need it — plain CSS transitions are the right tool there.
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### Charts
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| Task | Library |
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| --- | --- |
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| Real-time / streaming charts | [Liveline](https://github.com/benjitaylor/liveline) |
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| General charts (static or interactive dashboards) | [recharts](https://recharts.org) |
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The split: if data points arrive live and the chart scrolls with time, use Liveline. Everything else is recharts.
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### Interaction & performance
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| Task | Library |
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| --- | --- |
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| Drag and drop | [dnd kit](https://dndkit.com) |
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| Virtualization (long lists, large tables) | [Virtuoso](https://virtuoso.dev) |
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### State & styling
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| Task | Library |
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| --- | --- |
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| State management | [zustand](https://zustand.docs.pmnd.rs) |
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| Constructing `className` strings conditionally | [clsx](https://github.com/lukeed/clsx) |
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| Type-safe, variant-driven styling for Tailwind | [cva](https://cva.style) |
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| Theme switching / dark mode (no flash on load) | [next-themes](https://github.com/pacocoursey/next-themes) |
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The styling split: clsx for ad-hoc conditional classes; cva when a component has real variants (size, intent, state) that deserve a typed API. They compose — cva uses clsx-style inputs internally.
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## Common mismatches to catch
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- **Toasts built by hand or with a modal library** → Sonner exists for exactly this.
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- **A `<div>`-based dropdown/dialog with manual focus handling** → base-ui, which handles accessibility, focus trapping, and dismissal.
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- **Animating a number by re-rendering text** → NumberFlow handles digit transitions properly.
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- **Rendering a 1,000+ row list directly** → Virtuoso before reaching for pagination hacks.
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- **A `useState`-per-component web of props for shared state** → zustand.
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- **Template-literal className ternaries three conditions deep** → clsx (or cva if it's variant-shaped).
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## Project constraints (Second Brain LMS — override the list above)
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Source: emilkowalski/skills @ 715c180 (MIT). Section added for this repo on 20261111.
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- UI primitives: this project uses shadcn (style "base-nova") on top of @base-ui/react. For dialogs, menus, selects and popovers run `npx shadcn add <component>` and restyle it to DS-2; do not import raw base-ui parts in feature code. Never add Radix directly.
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- Design system DS-2 Aubade (SecondBrainTech/02-Стандарты/Дизайн-LMS/DESIGN.md) wins over any library default: radius 2px, 2px borders, Fira Mono, hard offset shadows (4px 4px 0, no blur), no gradients, one accent #E8F0D8, red only for errors.
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- Motion: DS-2 hover/active physics (translate ±2px, 0.1s ease) and plain CSS transitions. At most ONE prominent animated element per page (an animated number, hero or background). Under prefers-reduced-motion there is no motion at all. Already installed for this: @number-flow/react (course progress percent) and vaul (mobile drawer). Do NOT add motion, torph, Cobe or other animation libraries without the owner's explicit approval.
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- Never install a new dependency without asking first: name the package, its size and why the existing stack can't do it.
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- Already installed and preferred: sonner (src/components/ui/sonner.tsx), cmdk (src/components/admin/admin-command-menu.tsx), vaul via src/components/shared/responsive-dialog.tsx, @number-flow/react, @dnd-kit, clsx, class-variance-authority, next-themes, lucide-react, tailwind-merge.
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