An underline that leads with its front edge, and a pane that follows.
The prompt17,871 characters
Add the "Tabs" component from notboring to my project.
It is licensed for use in my projects — notboring.dev/license. Please:
1. Create the component at a sensible path for this
project, named Tabs, from the source below.
2. It needs nothing beyond React.
3. Add the CSS to the project's stylesheet.
4. THE PART THAT NEEDS YOUR JUDGMENT. The CSS reads
these custom properties and does not define them:
--font-ui
--ink
--ink-2
--ink-3
--ink-rgb
--pane-edge
They are notboring's design tokens. Map each one to
whatever this project already uses for the same
job — its own ink, ground, surface and UI font —
rather than defining them as new globals. If the
project has no equivalent, define it locally on
the component's own root so nothing leaks out.
Anything ending -rgb wants three bare numbers,
because the CSS builds rgba() from it.
Keep the comments. They say why the numbers are what
they are, and they are most of what makes this worth
copying rather than rewriting.
--- Tabs.tsx ---
import { useEffect, useId, useLayoutEffect, useRef, useState } from "react";
/* ══ Tabs ═════════════════════════════════════════════════
Four tabs, an underline, and a pane.
THE UNDERLINE LEADS WITH ITS FRONT EDGE. A line that slides
from one tab to the next as a fixed-width bar is a thing
being moved; a line whose near edge sets off first and
whose far edge follows is a thing REACHING for the next
tab and then gathering itself up, which is the difference
between a cursor and a gesture. It is two numbers — the
line's inset from the left and its inset from the right —
and the whole effect is that they do not take the same
time. Moving right, the right inset shrinks quickly and the
left inset catches up slowly; moving left, the two swap
durations.
Insets and not width-plus-transform, because a scaled bar
stretches its own end caps and a translated one cannot
change length. Two edges, each with a place to be, is the
honest description of a line between two points — and it
is all CSS, since nothing here needs to know where the
line is mid-flight.
The rest — the source and its comments — is what you are buying.