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@broberg/theme

v0.3.1

Published

Headless design-token theme store + neutral CSS baseline (Tailwind v4) for the broberg.ai estate. Framework-agnostic core + thin React/Preact adapters + a DESIGN.md → Tailwind v4 generator.

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Readme

@broberg/theme

The single source of truth for how every app in the broberg.ai estate looks — a framework-agnostic theme store plus a neutral shadcn/ui-compatible CSS token baseline. Flip light / dark / warm / cool the same way everywhere; rebrand from one place.

Two halves, one package — adopt as much as your stack supports:

  1. JS theme store (this npm package) — sets data-theme on <html>, persists to localStorage, notifies subscribers. Works in any app (React, Preact, vanilla; Tailwind or not). SSR-safe.
  2. CSS token baseline (css/neutral-preset.css) — copy-owned. Requires Tailwind v4 (it uses @theme, which cannot be @imported from node_modules). Non-Tailwind apps use the raw CSS variables directly.

Install

npm i @broberg/theme        # or pnpm / bun add

1. The CSS baseline (Tailwind v4)

Copy node_modules/@broberg/theme/css/neutral-preset.css into your app's CSS entry (e.g. globals.css). It ships the neutral token vocabulary, dark-first, with six named data-theme variants (light, dark, light-cool, light-warm, dark-cool, dark-warm) and the @theme inline bridge.

Brand override pattern

Override only what makes you you — --primary, --ring, --radius — in :root (and [data-theme="light"] if your brand color differs per mode):

:root {
  --primary:    oklch(0.82 0.17 85);  /* your brand color */
  --ring:       oklch(0.82 0.17 85);
  --radius:     0.625rem;
}

Everything else inherits the neutral baseline, so a new app is on-brand, accessible and dark-mode-ready in three lines.

Responsive & touch tokens

The preset also ships breakpoint tokens (--breakpoint-sm/md/lg/xl = 640/768/1024/1280, in the @theme block so Tailwind v4's sm:/md:/… variants resolve them) and a touch-target token (--touch-target-min: 44px in :root) — one source, so every app switches layouts at the same widths and never ships a sub-44px tap target:

.btn { min-height: var(--touch-target-min); min-width: var(--touch-target-min); }

Read the same values in JS (e.g. for matchMedia) from the headless core:

import { BREAKPOINTS, TOUCH_TARGET_MIN } from "@broberg/theme";
if (matchMedia(`(min-width: ${BREAKPOINTS.md}px)`).matches) { /* tablet and up */ }

BREAKPOINTS and --breakpoint-* are the same numbers; the DESIGN.md generator emits both from the breakpoints: / touch: token blocks.

2. The theme store

React / Next.js (Stack A)

import { ThemeProvider, useTheme, ThemeToggle } from "@broberg/theme/react";

// app root
<ThemeProvider defaultTheme="dark" followSystem>
  {children}
</ThemeProvider>

// anywhere
const { theme, setTheme, toggleTheme, themes } = useTheme();
<ThemeToggle />               // minimal light<->dark button, data-testid="theme-toggle"

useTheme subscribes via useSyncExternalStore — no next-themes dependency, SSR-safe. The full Sun/Moon/Monitor dropdown is copy-owned per app (build it from your own design-system components; ThemeToggle is a drop-in starter).

Preact / Bun (Stack B)

import { initTheme } from "@broberg/theme/preact";   // call once in your entry
import { useTheme } from "@broberg/theme/preact";

initTheme({ defaultTheme: "dark", followSystem: true });
const { theme, setTheme, toggleTheme } = useTheme();

Vanilla / no framework

import { initTheme, setTheme, toggleTheme, onThemeChange } from "@broberg/theme";
initTheme();
setTheme("dark-warm");

API

| Export | Description | |---|---| | initTheme(opts?) | Resolve (stored › system › default), apply to <html>, return the key. | | getTheme() | Current ThemeKey. | | setTheme(key) | Apply + persist + notify. No-op on invalid keys. | | toggleTheme() | Cycle light ⇄ dark (variants collapse to their base mode). | | onThemeChange(fn) | Subscribe; returns an unsubscribe. | | THEME_KEYS | All six ThemeKeys. | | BREAKPOINTS | { sm:640, md:768, lg:1024, xl:1280 } — responsive breakpoints (px) for matchMedia. | | TOUCH_TARGET_MIN | 44 — minimum touch-target size (px). |

InitThemeOptions: { defaultTheme?, followSystem?, storageKey? } (default key "broberg-theme").

Notes

  • Stack target: Tailwind v4 only — no v3 / legacy support by design.
  • The headless core imports no framework packages (tsc --noEmit clean; no next/*, no React/Preact in @broberg/theme).
  • Part of the broberg-ai/components monorepo (F001).