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Anthony LioandDanny White 38f448b01c fix(ui): tab component (#50183 )

## What kind of change does this PR introduce?
bug fix on tab component + a small refactor

## What is the current behavior?

the active tab in an underline list gets border-b-2 while its siblings
get nothing, so it's 2px taller and its label sits higher than the rest
causing a smol layout shift within docs

## What is the new behavior?

- adds one absolute positioned bar that slides between tabs so nothing
moves
- favors track under an underline as an inset shadow vs a border

| state | preview |
| -------|------|
| before | <video
src="https://github.com/user-attachments/assets/b73820a6-2994-46d1-aa98-452681f0fef2"
/> |
| after | <video
src="https://github.com/user-attachments/assets/054cd67d-a50c-4aef-9340-a1e1d515047b"
/> |


## Test
1. visit [api
reference](https://docs-git-antlio-ui-components-tabs-supabase.vercel.app/docs/reference/javascript/installing?platform=npm&queryGroups=platform)
2. visit a [guide
](https://docs-git-antlio-ui-components-tabs-supabase.vercel.app/docs/guides/database/prisma)


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

- **New Features**
- Added an animated tab indicator that follows the active tab and adapts
to layout changes.
  - Added support for customizing tab indicator styling.
- Respects reduced-motion preferences by disabling indicator transitions
when appropriate.

- **Style**
  - Streamlined tab borders, spacing, and underlined-tab styling.
- Improved tab panel spacing and standardized tab behavior in
documentation examples.
- Centralized easing behavior for smoother overlays, dropdowns, slides,
and panels.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

---------

Co-authored-by: Danny White <3104761+dnywh@users.noreply.github.com>

2026-09-16 00:00:27 +03:00

build/css

fix(ui): systematise control surface fills and hover borders (#48887 )

2026-08-18 16:54:25 +10:00

scripts

chore: Remove dead code and unused files from the packages/ui (#45169 )

2026-04-24 10:30:35 +02:00

src

fix(ui): tab component (#50183 )

2026-09-16 00:00:27 +03:00

.gitignore

remove Next/Link deps

2023-06-26 01:08:20 +08:00

components.json

chore: Expand prettier commands to also run on packages (#32550 )

2025-01-03 16:23:32 +01:00

index.tsx

fix(ui): tab component (#50183 )

2026-09-16 00:00:27 +03:00

package.json

chore(deps): upgrade vitest to v5 (#49994 )

2026-09-10 16:45:54 +08:00

README.md

chore: migrate from clsx + tailwind-merge to shadcn-ui/cn (#49938 )

2026-09-07 21:35:06 +08:00

tailwind.config.css

chore: Migrate the main Tailwind JS config to CSS (#45686 )

2026-05-13 13:14:58 +02:00

tsconfig.json

chore: Bump Typescript to v6 (#44204 )

2026-03-26 15:27:35 +01:00

vitest.config.ts

Add coveralls integration (#35424 )

2025-05-08 12:23:37 +02:00

vitest.setup.ts

chire: Sort imports in all packages, cms, design-system and ui-library apps (#41610 )

2026-02-05 13:54:10 +01:00

README.md

`packages/ui`

Supabase's shared React component library. Built on Radix UI primitives and shadcn/ui, styled with Tailwind CSS, and used across all Supabase apps.

Usage

Import from the 'ui' package alias:

import { Badge, Button, Input } from 'ui'

Some of the components have the _Shadcn_ suffix. These components should be preferred, they're in a process of replacing the other ones.

Utilities

// deep object merge (used for themes)
import { clipboard, cn, mergeDeep } from 'ui' // Tailwind class merging (shadcn-ui/cn)

// copy-to-clipboard helper

Styling conventions

Tailwind only — no inline styles or CSS modules.
Prefer shadcn semantic pairs (bg-card text-card-foreground, bg-muted text-muted-foreground, bg-tertiary text-tertiary-foreground) over hardcoded colors. Legacy utilities such as text-foreground-light and border-default are compatibility aliases only.
Control surface roles (bg-field, bg-control-raised, border-control-hover; CSS --control aliases raised) live in build/css/source/semantic.css. Prefer those over inventing fills. Legacy bg-control is still the accent wash alias.
Themes set the core --hue (or the split --surface-hue / --primary-hue), --chroma, --surface, --foreground-lightness, and --contrast inputs, plus their --muted-foreground-level and --tertiary-foreground-level hierarchy. Semantic colors are derived from them in OKLCH; --contrast: 1 is the baseline and the supported adjustment range is 0.75 to 1.25.
The workspace root owns the actual tailwind.config.js. The file in this package is a stub for IntelliSense only.