# Trace (Notchset): prompt.md (v2.0.0)

- id: `trace` · version 2.0.0 · component · free
- category: Data
- build: one set of files for every shadcn style
- install: `npx shadcn@latest add https://notchset.dev/r/trace.json`
- npm dependencies: @base-ui/react@^1, lucide-react@^1
- registry dependencies: utils, https://notchset.dev/r/notchset-foundation.json
- docs: https://notchset.dev/components/trace
- The install command carries everything this item needs (files, CSS, tokens, npm and registry dependencies). Prefer it to copying source by hand.

The provenance line under a reading (Ring / 07:02, Northside Lab · 16 Oct); pressed, it opens the slip: the source, when it was measured, the range it was read against and who set that range. The receipt's face, for a value..

## Build it
- Stack: React 18.3 or 19, TypeScript, Tailwind CSS v4 utility classes on the foundation's roles, a components.json (imports use its aliases).
- Packages: `@base-ui/react@^1`, `lucide-react@^1`.
- Files: `components/ui/notchset/trace.tsx`; shared code: `lib/notchset/popup.ts`, `lib/notchset/portal.ts`.
- Registry dependencies, installed with it automatically: shadcn `utils` (cn), `notchset-foundation`.
- Builds: one set of files, the same for every shadcn style.
- Exports to keep: `Trace`, and every exported type.
- CSS: the install adds the notchset foundation (its roles, keyframes and motion switch, reading your shadcn tokens for colour) 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.
- Colours: every part reads the foundation's roles (`--ns-canvas`, `--ns-ink`, `--ns-line`, `--ns-signal` …), which read your shadcn tokens (`--background`, `--foreground`, `--border`, `--destructive` …), plus the optional `--success` and `--warning`. Retheme on `:root` or any container; never add Tailwind colour classes inside the component.
- This item reads `--ns-deep-ink-2`, `--ns-ease`, `--ns-ease-panel`, `--ns-font-body`, `--ns-font-mono`, `--ns-hover`, `--ns-ink`, `--ns-ink-2`, `--ns-ink-3`, `--ns-line`, `--ns-menu-row`, `--ns-radius-lg`, `--ns-radius-sm`, `--ns-radius-xl`, `--ns-raised`, `--ns-shadow-float`, `--ns-sheet-bottom`, `--ns-signal`, `--ns-text-body`, `--ns-text-meta`, `--ns-text-small`, `--ns-time-color`, `--ns-time-menu`, `--ns-time-panel`, `--ns-weight-strong`.
- Retune it (on any ancestor) with the foundation's roles and hooks: `--ns-bad`, `--ns-bad-ink`, `--ns-band`, `--ns-band-edge`, `--ns-band-grade`, `--ns-band-optimal`, `--ns-beat`, `--ns-bezel`, `--ns-canvas`, `--ns-cat-1`, `--ns-cat-2`, `--ns-cat-3`, `--ns-cat-4`, `--ns-cat-5`, `--ns-cat-6`, `--ns-check`, `--ns-chip`, `--ns-control`, `--ns-control-pad`, `--ns-control-sm`, `--ns-deep`, `--ns-deep-ink`, `--ns-deep-ink-2`, `--ns-deep-line`, `--ns-dialog`, `--ns-dialog-lg`, `--ns-dialog-sm`, `--ns-ease`, `--ns-ease-in`, `--ns-ease-panel`, `--ns-ease-pop`, `--ns-field`, `--ns-flood-arc`, `--ns-flood-aurora`, `--ns-flood-behind-1`, `--ns-flood-behind-2`, `--ns-flood-bloom`, `--ns-flood-deep`, `--ns-flood-dial-bloom`, `--ns-flood-glass`, `--ns-flood-grain`, `--ns-flood-image`, `--ns-flood-ink`, `--ns-flood-ink-low`, `--ns-flood-light`, `--ns-flood-mid`, `--ns-flood-pale`, `--ns-flood-pane`, `--ns-flood-pane-edge`, `--ns-flood-pill-ink`, `--ns-flood-ribbon`, `--ns-flood-ribbon-core`, `--ns-flood-shadow`, `--ns-flood-sheen`, `--ns-flood-wash`, `--ns-font-body`, `--ns-font-display`, `--ns-font-mono`, `--ns-font-script`, `--ns-glass`, `--ns-glass-blur`, `--ns-glass-shadow`, `--ns-glow`, `--ns-grain`, `--ns-gutter`, `--ns-header`, `--ns-heat`, `--ns-hover`, `--ns-ink`, `--ns-ink-2`, `--ns-ink-3`, `--ns-ink-4`, `--ns-leading`, `--ns-lift`, `--ns-light-1`, `--ns-light-2`, `--ns-light-3`, `--ns-light-spread`, `--ns-light-strength`, `--ns-line`, `--ns-line-soft`, `--ns-lit-edge`, `--ns-menu-dy`, `--ns-menu-row`, `--ns-mesh`, `--ns-mesh-frost`, `--ns-ok`, `--ns-ok-ink`, `--ns-orb-body`, `--ns-orb-cool`, `--ns-orb-core`, `--ns-orb-dawn`, `--ns-orb-deep`, `--ns-orb-edge`, `--ns-orb-grain`, `--ns-orb-ground`, `--ns-orb-halo`, `--ns-orb-inner`, `--ns-orb-key`, `--ns-orb-lift`, `--ns-orb-limb`, `--ns-orb-limb-from`, `--ns-orb-rim`, `--ns-orb-skin-hi`, `--ns-orb-skin-lo`, `--ns-orb-skin-mid`, `--ns-orb-warm`, `--ns-panel`, `--ns-panel-w`, `--ns-prism-edge`, `--ns-prism-glint`, `--ns-prism-sheen`, `--ns-prism-tint`, `--ns-pulse`, `--ns-radius`, `--ns-radius-card`, `--ns-radius-full`, `--ns-radius-lg`, `--ns-radius-sm`, `--ns-radius-xl`, `--ns-raised`, `--ns-range`, `--ns-row`, `--ns-row-compact`, `--ns-segment`, `--ns-selected`, `--ns-series`, `--ns-series-core`, `--ns-series-lilac`, `--ns-series-tint`, `--ns-shadow-dialog`, `--ns-shadow-float`, `--ns-shadow-panel`, `--ns-sheet`, `--ns-sheet-bottom`, `--ns-side`, `--ns-signal`, `--ns-sleep-awake`, `--ns-sleep-deep`, `--ns-sleep-light`, `--ns-sleep-rem`, `--ns-space-1`, `--ns-space-2`, `--ns-space-3`, `--ns-space-4`, `--ns-space-5`, `--ns-space-6`, `--ns-space-8`, `--ns-space-section`, `--ns-stack-on`, `--ns-standing-critical`, `--ns-standing-in`, `--ns-standing-out`, `--ns-state-doing`, `--ns-state-done`, `--ns-state-review`, `--ns-state-todo`, `--ns-switch-h`, `--ns-switch-w`, `--ns-text-body`, `--ns-text-control`, `--ns-text-display`, `--ns-text-figure`, `--ns-text-headline`, `--ns-text-hero`, `--ns-text-lede`, `--ns-text-meta`, `--ns-text-page`, `--ns-text-record`, `--ns-text-small`, `--ns-text-strong`, `--ns-text-sub`, `--ns-text-title`, `--ns-tile-shadow`, `--ns-time-born`, `--ns-time-color`, `--ns-time-dialog`, `--ns-time-menu`, `--ns-time-page`, `--ns-time-panel`, `--ns-time-toast`, `--ns-tint`, `--ns-tint-ink`, `--ns-toast-bottom`, `--ns-toast-left`, `--ns-touch`, `--ns-tracking-display`, `--ns-tracking-headline`, `--ns-warn`, `--ns-warn-ink`, `--ns-wash-clay`, `--ns-wash-dusk`, `--ns-wash-graphite`, `--ns-wash-ink`, `--ns-wash-sage`, `--ns-wash-sand`, `--ns-weight-light`, `--ns-weight-medium`, `--ns-weight-regular`, `--ns-weight-strong`, `--ns-well`.
- Never add Tailwind colour classes inside the component.

```tsx
import { Trace } from "@/components/ui/notchset/trace";
```

## Parts
- A single export that takes props.

## Match the original
- Read `components/ui/notchset/trace.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

### Not when

## Built from
- Popup placement (shared helper, ships with it)
- Portal (shared helper, ships with it)

## Mistakes
- Recreating the component instead of installing it

## Usage

```tsx
"use client";
import { Trace } from "@/components/ui/notchset/trace";

export default function TraceDemo() {
  return (
    <div className="flex flex-col items-start gap-2">
      <span className="text-[44px] leading-none tabular-nums">61 <span className="text-[16px] text-[var(--ns-ink-2)]">ms</span></span>
      <Trace line={["Ring", "07:02"]} rows={[["Source", "Sleep ring"], ["Measured", "Last night · synced 07:02"], ["Read against", "Your usual 47–55 ms"], ["Range set by", "Your last 21 nights"]]} title="HRV: where this number comes from" />
    </div>
  );
}
```

## Props

| Prop | Type | Default | What it does |
|---|---|---|---|
| `line` | `string[]` |  | the line's parts, said in order |
| `rows` | `[string, React.ReactNode][]` |  | the slip's rows: what, then the words |
| `title` | `string` | `"Where this number comes from"` | what the slip is about ("HRV, last night") |
| `interactive` | `boolean` | `true` | the line alone, not a button |
| `tone` | `"default" \| "deep" \| "legible"` | `"default"` | on a dark surface, or legible (ink-2) where it carries weight |

Full docs: https://notchset.dev/components/trace

## Customising
- Colours: every part reads the foundation's roles (`--ns-canvas`, `--ns-ink`, `--ns-line`, `--ns-signal` …), which read your shadcn tokens (`--background`, `--foreground`, `--border`, `--destructive` …), plus the optional `--success` and `--warning`. Retheme on `:root` or any container; never add Tailwind colour classes inside the component.
- Dark mode follows the `.dark` class or `data-theme="dark"` on an ancestor (the shadcn and next-themes conventions).
- Update later: Commit or stash local changes first (or copy the files), so the update can be undone. Read https://notchset.dev/r/changelog.json for the new versions: a major version, an entry marked breaking or a merge says what to change. Then re-run the install with `--overwrite`, on a branch. It replaces the component's files, the shared helper files they import, and the item's CSS rules in the global stylesheet, so review the whole diff (components, shared files, CSS), re-apply your own edits, and run the app's typecheck, tests and build.

## Accessibility contract (preserve when editing)

## Install

```bash
npx shadcn@latest add https://notchset.dev/r/trace.json
```

Or add the `@notchset` registry to components.json and run `npx shadcn@latest add @notchset/trace`. Every components.json style gets the same files.

## Continue the workflow

- [Baseline meter](https://notchset.dev/components/baseline-meter)
- [Draw history](https://notchset.dev/components/draw-history)
- [Glance tile](https://notchset.dev/components/glance-tile)

## Source

### components/ui/notchset/trace.tsx

```tsx
// Notchset trace 2.0.0 · https://notchset.dev/changelog
"use client";
import * as React from "react";
import { Popover } from "@base-ui/react/popover";
import { ReceiptText } from "lucide-react";
import { cn } from "@/lib/utils";
import { popupPositioner, popupSurface } from "@/lib/notchset/popup";
import { usePortalContainer } from "@/lib/notchset/portal";

/*
 * Trace: "Numbers you can trace", the Health template's identity line (the Assistant's receipt, for a reading). Under
 * every reading one quiet line says where it came from ("Ring · 07:02", "Northside Lab · 16 Oct · page 2"); pressed,
 * it opens the slip: the source, when it was measured, the range it was read against and who set that range. Ink and
 * paper, read like a slip, the receipt's face and rules.
 *
 *   <Trace line={["Northside Lab", "16 Oct", "page 2"]} rows={[["Source", "Northside Lab, follow-up panel"], ["Measured", "16 Oct 2026, 08:10"], ["Read against", "Lab range < 99 mg/dL"], ["Range set by", "Northside Lab"]]} />
 */
type TraceProps = {
  /** the line's parts, said in order */
  line: string[];
  /** the slip's rows: what, then the words */
  rows: [string, React.ReactNode][];
  /** what the slip is about ("HRV, last night") */
  title?: string | undefined;
  /** the line alone, not a button */
  interactive?: boolean | undefined;
  /** on a dark surface, or legible (ink-2) where it carries weight */
  tone?: "default" | "deep" | "legible" | undefined;
  className?: string | undefined;
};

function Line({ parts }: { parts: string[] }) {
  return (
    <span className="inline-flex min-w-0 flex-wrap items-center gap-x-1.5 gap-y-0.5">
      {parts.map((p, i) => (
        <React.Fragment key={i}>
          {i > 0 && (
            <span aria-hidden className="opacity-50">
              /
            </span>
          )}
          <span>{p}</span>
        </React.Fragment>
      ))}
    </span>
  );
}

function Trace({ line, rows, title = "Where this number comes from", interactive = true, tone = "default", className }: TraceProps) {
  const portal = usePortalContainer();
  const face = cn("font-[family-name:var(--ns-font-mono)] text-[length:var(--ns-text-meta)] leading-none tabular-nums", tone === "deep" ? "text-[var(--ns-deep-ink-2)]" : tone === "legible" ? "text-[var(--ns-ink-2)]" : "text-[var(--ns-ink-3)]");
  if (!interactive)
    return (
      <span data-slot="trace" className={cn("inline-flex min-w-0 items-center gap-1.5", face, className)}>
        <ReceiptText aria-hidden className="size-3 shrink-0" />
        <Line parts={line} />
      </span>
    );
  return (
    <Popover.Root>
      <Popover.Trigger
        data-slot="trace"
        aria-label={`${line.join(", ")}. Trace this number`}
        className={cn(
          "relative z-[1] -mx-1.5 inline-flex min-h-7 max-w-full cursor-pointer items-center gap-1.5 self-start rounded-[var(--ns-radius-sm)] px-1.5 py-1 text-left outline-hidden [transition:box-shadow_var(--ns-time-color),color_var(--ns-time-color)] hover:shadow-[inset_0_0_0_1px_var(--ns-line)] focus-visible:outline-2 focus-visible:outline-[var(--ns-signal)] data-[popup-open]:shadow-[inset_0_0_0_1px_var(--ns-ink-3)]",
          face,
          className,
        )}
      >
        <ReceiptText aria-hidden className="size-3 shrink-0" />
        <Line parts={line} />
      </Popover.Trigger>
      <Popover.Portal container={portal}>
        <Popover.Positioner side="bottom" align="start" sideOffset={6} collisionPadding={{ top: 8, right: 8, left: 8, bottom: 80 }} className={popupPositioner}>
          <Popover.Popup data-slot="trace-slip" data-ns-layer="" data-ns-moves="" className={cn(popupSurface, "w-[min(360px,calc(100vw-16px))] p-4 font-[family-name:var(--ns-font-mono)] text-[length:var(--ns-text-meta)] leading-[1.55] tabular-nums")}>
            <Popover.Title className="m-0 flex items-center gap-1.5 font-[family-name:var(--ns-font-body)] text-[length:var(--ns-text-body)] font-[number:var(--ns-weight-strong)] text-[var(--ns-ink)]">
              <ReceiptText aria-hidden className="size-3.5" />
              {title}
            </Popover.Title>
            <hr aria-hidden className="my-2 border-0 border-t border-dashed border-[var(--ns-line)]" />
            <dl className="m-0">
              {rows.map(([k, v]) => (
                <div key={k} className="grid grid-cols-[104px_minmax(0,1fr)] gap-3 py-1">
                  <dt className="text-[var(--ns-ink-3)]">{k}</dt>
                  <dd className="m-0 min-w-0 text-[var(--ns-ink)] [overflow-wrap:anywhere]">{v}</dd>
                </div>
              ))}
            </dl>
          </Popover.Popup>
        </Popover.Positioner>
      </Popover.Portal>
    </Popover.Root>
  );
}

export { Trace, type TraceProps };
```

### lib/notchset/popup.ts

```tsx
// Notchset trace 2.0.0 · https://notchset.dev/changelog
/*
 * The one popup surface every list that opens from a control uses (select, combobox, recipient picker, and
 * menus in batch 3): the prototype's .menu. It drops just below its control, and on a phone it becomes a
 * bottom sheet with a grab handle and finger-sized rows. Kept as class strings so each primitive's own parts
 * wear the same look.
 */

/** On the Positioner: above everything but dialogs; on a phone, pinned to the bottom edge as a sheet (above a tab bar
    when the app sets --ns-sheet-bottom to its height). */
export const popupPositioner =
  "z-50 outline-hidden max-[600px]:!fixed max-[600px]:!inset-x-2 max-[600px]:!top-auto max-[600px]:!bottom-[calc(var(--ns-sheet-bottom)+env(safe-area-inset-bottom,0px))] max-[600px]:!left-2 max-[600px]:!w-auto max-[600px]:!transform-none";

/** On the Popup. */
export const popupSurface =
  "min-w-[max(var(--anchor-width,0px),180px)] max-h-[min(420px,70vh,var(--available-height,70vh))] overflow-auto overscroll-contain rounded-[var(--ns-radius-lg)] bg-[var(--ns-raised)] p-[5px] text-[length:var(--ns-text-body)] text-[var(--ns-ink)] shadow-[0_0_0_1px_var(--ns-line),var(--ns-shadow-float)] outline-hidden origin-[var(--transform-origin)] " +
  "[animation:ns-menu-in_var(--ns-time-menu)_var(--ns-ease)] data-ending-style:opacity-0 data-ending-style:[transition:opacity_110ms_ease] " +
  "max-[600px]:w-auto max-[600px]:min-w-0 max-[600px]:max-h-[70dvh] max-[600px]:rounded-[var(--ns-radius-xl)] max-[600px]:px-1.5 max-[600px]:pt-3.5 max-[600px]:pb-1.5 max-[600px]:[animation:ns-sheet-up_var(--ns-time-panel)_var(--ns-ease-panel)] " +
  "max-[600px]:before:absolute max-[600px]:before:top-[5px] max-[600px]:before:left-1/2 max-[600px]:before:h-1 max-[600px]:before:w-9 max-[600px]:before:-translate-x-1/2 max-[600px]:before:rounded-full max-[600px]:before:bg-[var(--ns-line)] max-[600px]:before:content-['']";

/** On each item. Highlight (pointer or arrow keys) is the hover wash; the chosen item carries a check. */
export const popupItem =
  "flex w-full min-h-[var(--ns-menu-row)] cursor-default items-center gap-[9px] rounded-[7px] px-[9px] text-left outline-hidden select-none data-highlighted:bg-[var(--ns-hover)] data-disabled:opacity-45 [&_svg:not([data-slot=company-mark])]:size-3.5 [&_svg]:shrink-0";

/** The quiet line a list shows when nothing matches. */
export const popupEmpty = "px-[9px] py-2 text-[length:var(--ns-text-small)] text-[var(--ns-ink-3)] empty:hidden";
```

### lib/notchset/portal.ts

```tsx
// Notchset trace 2.0.0 · https://notchset.dev/changelog
import * as React from "react";

/*
 * Where overlays (dialogs, menus, popovers, tooltips, toasts, sheets) portal to. By default the document body; a
 * host that themes or scopes a region (a preview stage, a shadow root, a tile in another theme) wraps it in
 * PortalContainer with an element inside that scope, so its overlays keep the region's roles and light or dark.
 */
const PortalContainerContext = React.createContext<HTMLElement | null>(null);

const PortalContainer = PortalContainerContext.Provider;

/** The element overlays portal into here, or undefined for the document body. */
function usePortalContainer(): HTMLElement | undefined {
  return React.useContext(PortalContainerContext) ?? undefined;
}

export { PortalContainer, PortalContainerContext, usePortalContainer };
```

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