docs(plans): dark-mode theme toggle — 5-task plan (#59)
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# Dark-Mode Theme Toggle Implementation Plan
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> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
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**Goal:** Ship a tri-state (Light/Dark/System) theme toggle that activates the existing `.dark` token set, persists to `localStorage`, defaults to System (live-tracking the OS), and never flashes on reload.
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**Architecture:** Client-only theming over CSS custom properties — no new dependency. A framework-free core (`theme.ts`) resolves/reads/applies the theme; a `useTheme` hook mirrors `use-locale`; a synchronous inline script in `index.html` applies the class before first paint; an icon segmented `ThemeSwitch` lives in the header next to `LangSwitch`. The `.dark` class on `<html>` activates the dark tokens migrated in #49.
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**Tech Stack:** React 19 + TS + pnpm, Tailwind v4 (OKLCH tokens in `index.css`), lucide-react (already a dep), Vitest + RTL + MSW + Storybook. Test runner: `pnpm test` (vitest, single pass).
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**Conventions:** pnpm; **no `any`/`eslint-disable`/`@ts-ignore`**; no codename; en/sv parity; source double-quote/semicolon, stories single-quote/no-semicolon; token classes only (no raw colors — `check:colors` must pass); guard DOM globals (`window`/`localStorage`/`matchMedia`/`document`) for jsdom/test safety.
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**Spec:** `docs/superpowers/specs/2026-06-07-dark-mode-theme-toggle-design.md`
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**File structure:**
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- `web/src/theme/theme.ts` (new) — `THEME_KEY`, `Theme`, `resolveTheme`, `readTheme`, `applyTheme`.
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- `web/src/theme/theme.test.ts` (new) — unit tests for the core.
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- `web/src/theme/use-theme.ts` (new) — `useTheme()` hook.
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- `web/src/shell/theme-switch.tsx` (new) — the icon segmented control.
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- `web/src/shell/theme-switch.test.tsx` (new) — interaction tests.
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- `web/src/shell/theme-switch.stories.tsx` (new) — Storybook story.
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- `web/src/shell/app-shell.tsx` (modify) — mount `<ThemeSwitch />`.
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- `web/src/i18n/en.json`, `web/src/i18n/sv.json` (modify) — `theme.*` keys.
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- `web/index.html` (modify) — inline FOUC-prevention script.
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- `web/src/index.css` (modify) — dark `--primary`/`--ring` contrast tweak.
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---
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# Task 1: Theme core (`theme.ts`) + unit tests
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**Files:**
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- Create: `web/src/theme/theme.ts`
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- Create: `web/src/theme/theme.test.ts`
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- [ ] **Step 1: Write the failing tests** — `web/src/theme/theme.test.ts`:
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```ts
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import { afterEach, expect, test, vi } from "vitest";
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import { applyTheme, readTheme, resolveTheme, THEME_KEY } from "./theme";
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function mockMatchMedia(matches: boolean) {
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vi.stubGlobal("matchMedia", (query: string) => ({
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matches,
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media: query,
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onchange: null,
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addEventListener: vi.fn(),
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removeEventListener: vi.fn(),
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addListener: vi.fn(),
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removeListener: vi.fn(),
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dispatchEvent: vi.fn(),
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}));
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}
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afterEach(() => {
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vi.unstubAllGlobals();
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localStorage.clear();
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document.documentElement.classList.remove("dark");
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});
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test("resolveTheme returns explicit values verbatim", () => {
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expect(resolveTheme("light")).toBe("light");
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expect(resolveTheme("dark")).toBe("dark");
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});
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test("resolveTheme maps system via prefers-color-scheme", () => {
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mockMatchMedia(true);
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expect(resolveTheme("system")).toBe("dark");
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mockMatchMedia(false);
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expect(resolveTheme("system")).toBe("light");
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});
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test("readTheme defaults to system when unset or invalid", () => {
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expect(readTheme()).toBe("system");
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localStorage.setItem(THEME_KEY, "bogus");
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expect(readTheme()).toBe("system");
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localStorage.setItem(THEME_KEY, "dark");
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expect(readTheme()).toBe("dark");
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});
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test("applyTheme toggles the dark class on documentElement", () => {
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mockMatchMedia(false);
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applyTheme("dark");
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expect(document.documentElement.classList.contains("dark")).toBe(true);
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applyTheme("light");
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expect(document.documentElement.classList.contains("dark")).toBe(false);
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mockMatchMedia(true);
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applyTheme("system");
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expect(document.documentElement.classList.contains("dark")).toBe(true);
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});
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```
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- [ ] **Step 2: Run to verify it fails**
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Run: `cd web && pnpm vitest run src/theme/theme.test.ts`
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Expected: FAIL — cannot import from `./theme` (module not found).
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- [ ] **Step 3: Implement** — `web/src/theme/theme.ts`:
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```ts
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export const THEME_KEY = "theme";
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export type Theme = "light" | "dark" | "system";
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const THEMES: readonly Theme[] = ["light", "dark", "system"];
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function prefersDark(): boolean {
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return (
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typeof window !== "undefined" &&
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typeof window.matchMedia === "function" &&
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window.matchMedia("(prefers-color-scheme: dark)").matches
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);
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}
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export function resolveTheme(theme: Theme): "light" | "dark" {
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if (theme === "light" || theme === "dark") return theme;
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return prefersDark() ? "dark" : "light";
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}
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export function readTheme(): Theme {
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if (typeof localStorage === "undefined") return "system";
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const stored = localStorage.getItem(THEME_KEY);
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return THEMES.includes(stored as Theme) ? (stored as Theme) : "system";
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}
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export function applyTheme(theme: Theme): void {
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if (typeof document === "undefined") return;
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document.documentElement.classList.toggle("dark", resolveTheme(theme) === "dark");
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}
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```
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- [ ] **Step 4: Run to verify it passes**
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Run: `cd web && pnpm vitest run src/theme/theme.test.ts`
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Expected: PASS (4 tests).
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- [ ] **Step 5: Commit**
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```bash
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git add web/src/theme/theme.ts web/src/theme/theme.test.ts
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git commit -m "feat(web): theme core — resolve/read/apply tri-state theme (#59)"
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```
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---
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# Task 2: `useTheme` hook
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**Files:**
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- Create: `web/src/theme/use-theme.ts`
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(No standalone unit test — the hook is exercised by `theme-switch.test.tsx` in Task 3, which drives it through real UI per the project's testing style. `theme.ts` carries the logic and is unit-tested in Task 1.)
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- [ ] **Step 1: Implement** — `web/src/theme/use-theme.ts`:
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```ts
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import { useEffect, useState } from "react";
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import { applyTheme, readTheme, type Theme } from "./theme";
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export function useTheme(): { theme: Theme; setTheme: (theme: Theme) => void } {
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const [theme, setThemeState] = useState<Theme>(readTheme);
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const setTheme = (next: Theme) => {
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if (typeof localStorage !== "undefined") localStorage.setItem("theme", next);
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setThemeState(next);
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applyTheme(next);
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};
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useEffect(() => {
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applyTheme(theme);
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if (theme !== "system") return;
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if (typeof window === "undefined" || typeof window.matchMedia !== "function") return;
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const mql = window.matchMedia("(prefers-color-scheme: dark)");
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const onChange = () => applyTheme("system");
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mql.addEventListener("change", onChange);
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return () => mql.removeEventListener("change", onChange);
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}, [theme]);
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return { theme, setTheme };
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}
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```
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Note: import `THEME_KEY` from `./theme` and use it instead of the literal `"theme"` for the
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`localStorage.setItem` key (DRY with the core). Update the import line to
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`import { applyTheme, readTheme, THEME_KEY, type Theme } from "./theme";` and use
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`localStorage.setItem(THEME_KEY, next)`.
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- [ ] **Step 2: Typecheck**
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Run: `cd web && pnpm typecheck`
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Expected: PASS (no errors).
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- [ ] **Step 3: Commit**
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```bash
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git add web/src/theme/use-theme.ts
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git commit -m "feat(web): useTheme hook with live system tracking (#59)"
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```
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---
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# Task 3: `ThemeSwitch` UI + i18n + tests + story
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**Files:**
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- Create: `web/src/shell/theme-switch.tsx`
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- Create: `web/src/shell/theme-switch.test.tsx`
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- Create: `web/src/shell/theme-switch.stories.tsx`
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- Modify: `web/src/i18n/en.json`, `web/src/i18n/sv.json`
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- [ ] **Step 1: Add i18n keys.** In `web/src/i18n/en.json`, add a top-level `theme` namespace (place after the `labels` entry):
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```json
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"theme": { "light": "Light", "dark": "Dark", "system": "System" },
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```
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In `web/src/i18n/sv.json`, the matching entry:
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```json
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"theme": { "light": "Ljust", "dark": "Mörkt", "system": "System" },
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```
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- [ ] **Step 2: Write the failing test** — `web/src/shell/theme-switch.test.tsx`:
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```tsx
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import { afterEach, beforeEach, expect, test, vi } from "vitest";
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import { screen } from "@testing-library/react";
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import userEvent from "@testing-library/user-event";
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import { renderApp } from "../test/render";
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import { ThemeSwitch } from "./theme-switch";
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beforeEach(() => {
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vi.stubGlobal("matchMedia", (query: string) => ({
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matches: false,
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media: query,
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onchange: null,
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addEventListener: vi.fn(),
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removeEventListener: vi.fn(),
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addListener: vi.fn(),
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removeListener: vi.fn(),
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dispatchEvent: vi.fn(),
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}));
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});
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afterEach(() => {
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vi.unstubAllGlobals();
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localStorage.clear();
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document.documentElement.classList.remove("dark");
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});
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test("selecting Dark applies the dark class and persists", async () => {
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renderApp(<ThemeSwitch />);
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await userEvent.click(screen.getByRole("button", { name: /dark/i }));
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expect(document.documentElement.classList.contains("dark")).toBe(true);
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expect(localStorage.getItem("theme")).toBe("dark");
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expect(screen.getByRole("button", { name: /dark/i })).toHaveAttribute(
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"aria-pressed",
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"true",
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);
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});
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test("selecting Light removes the dark class and persists", async () => {
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localStorage.setItem("theme", "dark");
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renderApp(<ThemeSwitch />);
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await userEvent.click(screen.getByRole("button", { name: /light/i }));
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expect(document.documentElement.classList.contains("dark")).toBe(false);
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expect(localStorage.getItem("theme")).toBe("light");
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});
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test("selecting System resolves via prefers-color-scheme", async () => {
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vi.stubGlobal("matchMedia", (query: string) => ({
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matches: true,
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media: query,
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onchange: null,
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addEventListener: vi.fn(),
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removeEventListener: vi.fn(),
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addListener: vi.fn(),
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removeListener: vi.fn(),
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dispatchEvent: vi.fn(),
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}));
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renderApp(<ThemeSwitch />);
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await userEvent.click(screen.getByRole("button", { name: /system/i }));
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expect(localStorage.getItem("theme")).toBe("system");
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expect(document.documentElement.classList.contains("dark")).toBe(true);
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});
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```
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- [ ] **Step 3: Run to verify it fails**
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Run: `cd web && pnpm vitest run src/shell/theme-switch.test.tsx`
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Expected: FAIL — cannot import `ThemeSwitch`.
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- [ ] **Step 4: Implement** — `web/src/shell/theme-switch.tsx`:
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```tsx
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import { Monitor, Moon, Sun } from "lucide-react";
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import { useTranslation } from "react-i18next";
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import { useTheme } from "../theme/use-theme";
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import type { Theme } from "../theme/theme";
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import { cn } from "@/lib/utils";
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const OPTIONS: { value: Theme; Icon: typeof Sun }[] = [
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{ value: "light", Icon: Sun },
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{ value: "dark", Icon: Moon },
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{ value: "system", Icon: Monitor },
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];
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export function ThemeSwitch() {
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const { t } = useTranslation();
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const { theme, setTheme } = useTheme();
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return (
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<div className="flex gap-1">
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{OPTIONS.map(({ value, Icon }) => {
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const active = theme === value;
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return (
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<button
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key={value}
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type="button"
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onClick={() => setTheme(value)}
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aria-pressed={active}
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aria-label={t(`theme.${value}`)}
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title={t(`theme.${value}`)}
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className={cn(
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"rounded-md p-1 transition-colors",
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active
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? "bg-accent text-foreground"
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: "text-muted-foreground hover:text-foreground",
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)}
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>
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<Icon className="h-4 w-4" aria-hidden />
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</button>
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);
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})}
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</div>
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);
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}
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```
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(Verify the `cn` import path matches the project — other `ui/*` files import `cn` from `@/lib/utils`. If `lib/utils` is absent, mirror whatever `button.tsx` uses.)
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- [ ] **Step 5: Run to verify it passes**
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Run: `cd web && pnpm vitest run src/shell/theme-switch.test.tsx`
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Expected: PASS (3 tests).
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- [ ] **Step 6: Write the Storybook story** — `web/src/shell/theme-switch.stories.tsx`:
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```tsx
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import type { Meta, StoryObj } from '@storybook/react-vite'
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import { expect } from 'storybook/test'
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import { ThemeSwitch } from './theme-switch'
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const meta = {
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component: ThemeSwitch,
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tags: ['ai-generated'],
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} satisfies Meta<typeof ThemeSwitch>
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export default meta
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type Story = StoryObj<typeof meta>
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export const Default: Story = {
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play: async ({ canvas }) => {
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await expect(canvas.getByRole('button', { name: /light/i })).toBeInTheDocument()
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await expect(canvas.getByRole('button', { name: /dark/i })).toBeInTheDocument()
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await expect(canvas.getByRole('button', { name: /system/i })).toBeInTheDocument()
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},
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}
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```
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(Note: the story exercises rendering only — it does not click options, to avoid mutating `<html>`
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globally across the browser-mode test run.)
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- [ ] **Step 7: Run the story as a test + lint**
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Run: `cd web && pnpm vitest run src/shell/theme-switch.stories.tsx && pnpm lint`
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Expected: PASS.
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- [ ] **Step 8: Commit**
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```bash
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git add web/src/shell/theme-switch.tsx web/src/shell/theme-switch.test.tsx web/src/shell/theme-switch.stories.tsx web/src/i18n/en.json web/src/i18n/sv.json
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git commit -m "feat(web): ThemeSwitch icon segmented control + theme.* i18n (#59)"
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```
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---
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# Task 4: Mount in the header + FOUC inline script
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**Files:**
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- Modify: `web/src/shell/app-shell.tsx`
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- Modify: `web/index.html`
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- [ ] **Step 1: Mount `ThemeSwitch`.** In `web/src/shell/app-shell.tsx`, add the import:
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```tsx
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import { ThemeSwitch } from "./theme-switch";
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```
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and render it in the header immediately before `<LangSwitch />`:
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```tsx
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<div className="flex-1" />
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<ThemeSwitch />
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<LangSwitch />
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```
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(Match the existing header's exact JSX; only insert the one line. Do not change other markup.)
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- [ ] **Step 2: Add the FOUC-prevention inline script.** In `web/index.html`, inside `<head>`
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BEFORE the `<script type="module" src="/src/main.tsx">` tag, add:
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```html
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<script>
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try {
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var t = localStorage.getItem("theme") || "system";
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var dark =
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t === "dark" ||
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(t === "system" &&
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window.matchMedia("(prefers-color-scheme: dark)").matches);
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document.documentElement.classList.toggle("dark", dark);
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} catch (e) {}
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</script>
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```
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- [ ] **Step 3: Verify the app-shell test still passes** (the header now has an extra control):
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Run: `cd web && pnpm vitest run src/shell/app-shell.test.tsx`
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Expected: PASS (the existing "language switch" test is unaffected — ThemeSwitch buttons have distinct accessible names).
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- [ ] **Step 4: Build to verify `index.html` is valid**
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Run: `cd web && pnpm build`
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Expected: built successfully (Vite processes the inline script).
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||||
- [ ] **Step 5: Commit**
|
||||
|
||||
```bash
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git add web/src/shell/app-shell.tsx web/index.html
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git commit -m "feat(web): mount ThemeSwitch in header + pre-paint theme init (#59)"
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```
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||||
---
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||||
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||||
# Task 5: Dark `--primary` contrast tweak + final verification
|
||||
|
||||
**Files:**
|
||||
- Modify: `web/src/index.css`
|
||||
|
||||
- [ ] **Step 1: Compute the new dark `--primary`.** The dark button label uses `--primary-foreground:
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||||
oklch(0.205 0 0)` (near-black) on `--primary: oklch(0.673 0.182 276.935)` (~3.21:1). Lower the
|
||||
lightness (and keep it a recognizable indigo) until WCAG contrast vs `oklch(0.205 0 0)` is **≥4.5:1**.
|
||||
A good starting point is `oklch(0.62 0.20 277)`; compute the exact value with a contrast check
|
||||
(convert both to sRGB relative luminance, `(L1+0.05)/(L2+0.05) ≥ 4.5`). In the `.dark` block of
|
||||
`web/src/index.css`, update BOTH `--primary` and `--ring` (they must match) to the chosen value:
|
||||
|
||||
```css
|
||||
--primary: oklch(<chosen-L> <chosen-C> 277);
|
||||
...
|
||||
--ring: oklch(<chosen-L> <chosen-C> 277);
|
||||
```
|
||||
|
||||
Leave `--primary-foreground: oklch(0.205 0 0)` and the entire `:root` (light) block unchanged.
|
||||
|
||||
- [ ] **Step 2: Verify the contrast.** State the computed ratio in the commit body (must be ≥4.5:1).
|
||||
Sanity-check the value is still visibly indigo (hue ~277, chroma not flattened to gray).
|
||||
|
||||
- [ ] **Step 3: Full gate (single test pass).**
|
||||
|
||||
Run:
|
||||
```bash
|
||||
cd web && pnpm typecheck && pnpm lint && pnpm test && pnpm build && pnpm check:size && pnpm check:colors
|
||||
```
|
||||
Expected: all green. `check:colors` passes (icons are not color utilities). `check:size` within 250 KB
|
||||
gz (three lucide icons are negligible). Tests run exactly ONCE (no concurrent runs).
|
||||
|
||||
- [ ] **Step 4: Codename + status checks.**
|
||||
|
||||
```bash
|
||||
git grep -in 'biggus\|dickus' -- web/src web/index.html; echo "codename-exit=$?"
|
||||
git status --short
|
||||
```
|
||||
Expected: no codename matches; working tree shows only intended changes.
|
||||
|
||||
- [ ] **Step 5: Manual smoke (recommended).** `pnpm dev`, toggle Light/Dark/System; confirm the app
|
||||
switches, a dark reload doesn't flash light, primary buttons are legible in dark, and switching the
|
||||
OS theme while in System updates the app live.
|
||||
|
||||
- [ ] **Step 6: Commit**
|
||||
|
||||
```bash
|
||||
git add web/src/index.css
|
||||
git commit -m "fix(web): raise dark --primary contrast to AA for button labels (#59)"
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## Self-Review (completed)
|
||||
|
||||
**Spec coverage:** tri-state model + System default (T1 `resolveTheme`/`readTheme`, T3 UI); persisted
|
||||
to localStorage (T2 `setTheme`, T3 tests); `.dark` on `<html>` (T1 `applyTheme`); live system tracking
|
||||
(T2 `useEffect` matchMedia listener); FOUC prevention (T4 inline script); icon segmented control next
|
||||
to LangSwitch (T3 + T4 mount); en/sv `theme.*` (T3); aria-pressed/aria-label (T3); dark `--primary`
|
||||
contrast ≥4.5:1 + `--ring` sync (T5); gate incl. check:colors/check:size + no codename + no new dep
|
||||
(T5). All acceptance criteria 1–6 mapped. ✓
|
||||
|
||||
**Placeholder scan:** the only "computed" value is the exact dark `--primary` OKLCH — a genuine WCAG
|
||||
measurement step with a concrete starting point and an explicit acceptance threshold (≥4.5:1), not a
|
||||
TODO. All code blocks are complete. ✓
|
||||
|
||||
**Type consistency:** `Theme` type defined in `theme.ts` (T1), imported by `use-theme.ts` (T2) and
|
||||
`theme-switch.tsx` (T3); `THEME_KEY` from `theme.ts` used in T2's setter; `resolveTheme`/`readTheme`/
|
||||
`applyTheme` signatures consistent across tasks; i18n keys `theme.light/dark/system` defined in T3 and
|
||||
referenced by `t(\`theme.${value}\`)` in T3's component. ✓
|
||||
|
||||
## Notes
|
||||
- No new dependency (lucide-react already present; `.dark` tokens already exist from #49).
|
||||
- The inline FOUC script is intentionally plain ES5-ish + try/catch — it runs before the bundle and
|
||||
must never throw.
|
||||
- Cross-tab sync and per-account/server theme default are explicit follow-ups (not in this plan).
|
||||
Reference in New Issue
Block a user