# Multi-select (Notchset): prompt.md (v1.0.0)

- id: `multi-select` · version 1.0.0 · component · pro (Pro)
- category: Inputs
- build: Base UI (one set of files; its dependencies follow the build)
- install (this build): `npx shadcn@latest add @beautiful-ui-pro/multi-select`
- npm dependencies: none
- registry dependencies: utils, https://beautiful-ui.dev/r/notchset-foundation.json
- docs: https://beautiful-ui.dev/components/multi-select
- The install command carries everything this item needs (files, CSS, tokens, npm and registry dependencies). Prefer it to copying source by hand.

A multi-pick: two chips and +N on the trigger, a panel that stays open with ALL and NONE and drawing checks, and a ruler under the field splitting the whole into each option's share.

## Build it
- Stack: React 19 (`ref` is a plain prop), TypeScript, Tailwind CSS v4 utilities, a shadcn-initialised project with the `@/*` alias.
- Packages: none beyond React.
- Files: `components/ui/notchset/multi-select.tsx`; shared code: `lib/beautiful-ui/notchset/instrument.tsx`, `lib/beautiful-ui/notchset/root.ts`.
- Registry dependencies, installed with it automatically: shadcn `utils` (cn), `notchset-foundation`.
- Builds: one set of files for both, but its dependencies come in Base UI and Radix builds. Install the one that matches the project (see Install): a free item's bare URL installs the Base UI build of it and its dependencies.
- Exports to keep: `MultiSelect`, and every exported type.
- CSS: the install adds the notchset foundation (tokens, keyframes, motion levels) to your global stylesheet once. Nothing to import by hand.
- Re-running `add` (or `--overwrite`) re-applies those rules: put overrides in your own CSS, never in the installed rules.
- Tokens: retheme with the `--notchset-*` custom properties (`--notchset-check`, `--notchset-control-edge`, `--notchset-draw-from`, `--notchset-ease-bloom`, `--notchset-ease-travel`, `--notchset-fade`, `--notchset-focus-color`, `--notchset-focus-inset`, `--notchset-life-from`, `--notchset-life-ms`, `--notchset-node-blink`, `--notchset-node-bloom`, `--notchset-node-delay`, `--notchset-plate-color`, `--notchset-rise-from`, `--notchset-rule`, `--notchset-scroll`, `--notchset-signal`, `--notchset-sweep-to`). Never add Tailwind colour classes inside the component.

```tsx
import { MultiSelect, type MultiSelectOption } from "@/components/ui/notchset/multi-select";
```

## Parts

| Part | data-slot | What it is for |
|---|---|---|
| `MultiSelect` | `multi-select` | The trigger and panel. |

Style a part with `[data-slot="<slot>"]` selectors or its `className`; keep the attributes when editing.

## Sound
- Keep every `data-slot` and `data-sound` attribute: the sound layer reads them.
- Installing this item adds no audio. Nothing plays until the app mounts `SoundProvider` once (install: `npx shadcn@latest add https://beautiful-ui.dev/r/notchset-sound.json`, import from `@/components/ui/notchset/sound-provider`); `useSound()` gives `muted` and `setMuted` for a mute control. Without a provider the audio engine never loads.

## Match the original
- Read `components/ui/notchset/multi-select.tsx` as the reference implementation before changing or recreating anything, and match it: sizes, colours per theme, motion timings, copy and behaviour.
- If you deviate (a prop you can't honour, a style you changed, a dependency you swapped), say so in your reply, part by part.
- Keep the accessibility contract, the keyboard map and the motion levels listed below.

## Use it when
- multi select, multiselect, checklist dropdown, choose many, filters, Notchset
- Choosing several of a known list, where their sizes matter

### Not when
- Free-form values: use Token Field

## Mistakes
- Give weights if sizes matter; without them the ruler splits evenly

## Usage

```tsx
"use client";

import * as React from "react";
import { MultiSelect, type MultiSelectOption } from "@/components/ui/notchset/multi-select";

const suites: MultiSelectOption[] = [
  { value: "planner-core", label: "planner-core", weight: 1200 },
  { value: "citations", label: "citations", weight: 420 },
  { value: "safety", label: "safety", weight: 310 },
];

export function SuitePicker() {
  const [picked, setPicked] = React.useState<string[]>(["planner-core"]);
  return <MultiSelect options={suites} value={picked} onValueChange={setPicked} label="EVAL SUITES" />;
}
```

## Props

| Prop | Type | Default | What it does |
|---|---|---|---|
| `options` | `{ value, label, weight? }[]` |  | The list; weight is its share. |
| `value / onValueChange` | `string[]` |  | Controlled. |
| `chips` | `number` |  | Shown before +N (2). |
| `summary` | `(picked, whole, count) => ReactNode` |  | The line under the ruler. |

Full docs: https://beautiful-ui.dev/components/multi-select

## Customising
- Colours: the component reads your shadcn tokens (`--background`, `--foreground`, `--border` …), refined by the `--notchset-*` tokens. The signal colour is `--notchset-signal` (it falls back to `--destructive`). Set tokens on `:root`, or on any container to retheme one area.
- Dark mode follows the `.dark` class on an ancestor (the shadcn and next-themes convention).
- Update later by re-running the install with `--overwrite` (review the diff if you edited it). Changelog: https://beautiful-ui.dev/r/changelog.json

## Keyboard

| Keys | Action |
|---|---|
| ↓ / Enter / Space | Open |
| ↑ / ↓ | Move |
| Space / Enter | Toggle |
| Esc / Tab | Close |

## Performance

- Synchronous over your options; the ruler is a handful of SVG lines.

## Responsive

- Fills its container; chips give way to +N rather than wrap.

## Motion inventory

| Interaction | What moves |
|---|---|
| Toggle | The check draws in (220ms); a new chip pops in |
| Ruler | Picked segments thicken to 4px (300ms) |

## Accessibility contract (preserve when editing)
- role=combobox over a multiselectable listbox; aria-selected per option
- Backspace while closed removes the last pick

## Install

```bash
npx shadcn@latest add @beautiful-ui-pro/multi-select
```

Pro item: needs the `@beautiful-ui-pro` registry in `components.json` and `BEAUTIFUL_UI_TOKEN` in `.env.local` (https://beautiful-ui.dev/account). Setup: https://beautiful-ui.dev/docs/pro. Your components.json `style` picks the build: radix-*, new-york and default get Radix, base-* gets Base UI.

## Credits
- Built on shadcn/ui (https://ui.shadcn.com)

The notchset foundation (the tokens listed above, keyframes and motion levels) installs once with the first component; its CSS is public at https://beautiful-ui.dev/r/notchset-foundation.json.