A split button: the thing you nearly always want, and the small door to the two you sometimes do.
The prompt14,587 characters
Add the "Button Group" 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 ButtonGroup, from the source below.
2. Install what it needs: npm i framer-motion lucide-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:
--card
--card-rgb
--font-ui
--ink
--ink-4
--ink-rgb
--on-ink
--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.
5. IF YOU CHANGE IT, GO ALL THE WAY. This block is
built for every state its object can really be
in — empty, one, full, refused, undone, pressed
twice, interrupted halfway — and not only the one
the demo opens on. Adapt it and the same standard
holds: work out that list before you write, and
build the whole of it. Never settle for the
minimum that makes the screenshot right. A
component somebody has to come back and finish is
the thing this was written to replace.
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.
--- ButtonGroup.tsx ---
import { useEffect, useRef, useState } from "react";
import { AnimatePresence, motion } from "framer-motion";
import { Check, ChevronDown, GitMerge } from "lucide-react";
/* ══ Button Group ═════════════════════════════════════════
Two buttons made of one: the thing you almost always want,
and the small door to the two you sometimes do.
THE DEFAULT IS A PRESS, NOT A CHOICE. A dropdown of three
equal options costs two presses every time, including the
nine times out of ten you wanted the first one. A split
button costs one — and the tenth time, the caret is right
there. The seam between the halves is a 1px gap of the card
showing through rather than a border, which is how two
surfaces meet in this house.
AND THE CHOICE STICKS. Picking Squash does not run it and
walk away: it becomes the button, the word rolls over, and
the next press does the thing you last chose. A split
button whose main half never changes is a menu wearing a
button's clothes.
THE PANEL COMES OUT OF THE CARET, AND THE BUTTON DOES NOT
MOVE. Its origin is that corner, so it unfolds from the
The rest — the source and its comments — is what the plan opens.