Implemented a dynamic theme toggle in the top right, featuring a sun …#18
Implemented a dynamic theme toggle in the top right, featuring a sun …#18UTTKARSHCODER wants to merge 6 commits intoStabilityNexus:mainfrom
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…icon for light mode and a moon icon for dark mode.
WalkthroughReplaces the previous Matrix-heavy homepage with a ThemeProvider-based structure. Adds a client-side theming system (ThemeProvider, useTheme, ThemeToggle) that initializes from localStorage or system preference, applies the root dark class, and moves theme persistence and mounted handling into the provider. Changes
Sequence Diagram(s)sequenceDiagram
autonumber
participant Browser
participant ThemeProvider
participant LocalStorage
participant DOM as document.documentElement
participant ThemeToggle
Browser->>ThemeProvider: mount (client)
ThemeProvider->>LocalStorage: read "theme" (try/catch)
alt stored theme present
LocalStorage-->>ThemeProvider: storedTheme
ThemeProvider->>DOM: applyTheme(storedTheme) (toggle .dark)
else no stored theme
ThemeProvider->>Browser: query prefers-color-scheme
Browser-->>ThemeProvider: prefers (dark/light)
ThemeProvider->>DOM: applyTheme(resolvedTheme)
end
ThemeProvider-->>Browser: set mounted = true
Browser->>ThemeToggle: user clicks
ThemeToggle->>ThemeProvider: toggleTheme()
ThemeProvider->>LocalStorage: write new theme (try/catch)
ThemeProvider->>DOM: applyTheme(newTheme)
ThemeProvider-->>ThemeToggle: updated theme state
Estimated code review effort🎯 3 (Moderate) | ⏱️ ~25 minutes
Possibly related PRs
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✅ Passed checks (2 passed)
✨ Finishing touches
🧪 Generate unit tests (beta)
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🔇 Additional comments (3)
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Actionable comments posted: 5
🧹 Nitpick comments (1)
app/page.tsx (1)
82-82: Add TypeScript return type and consider naming convention.Add explicit return type. Also, consider that Next.js page components are typically named
Pageor descriptively (e.g.,HomePage) rather thanApp.Apply this diff:
-export default function App() { +export default function App(): JSX.Element {
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app/page.tsx (1)
95-135: Review content for production readiness.The main content section contains demo/instructional text describing the theme implementation itself ("Theme Fix Applied", "Instructions", etc.). Verify whether this is placeholder content that should be replaced with actual page content before merging to production.
If this is temporary demo content, consider replacing it with the actual hodlCoin website content or creating a separate demo page.
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Actionable comments posted: 2
🧹 Nitpick comments (2)
app/page.tsx (2)
241-241: Grid layout lacks mobile responsiveness.The fixed
1fr 1frgrid will display two narrow columns on mobile devices, making the content difficult to read. Inline styles cannot use media queries for responsive adjustments.Consider using Tailwind CSS (which appears to be available based on the
classNameusage inThemeToggle) for responsive layouts:- <div style={{ display: 'grid', gridTemplateColumns: '1fr 1fr', gap: '24px' }}> + <div className="grid grid-cols-1 md:grid-cols-2 gap-6">Alternatively, if keeping inline styles, consider a single-column layout that works on all screen sizes, or migrate to CSS modules/Tailwind for proper responsive handling.
145-171: Consider consistent styling approach.The component uses inline styles extensively while
ThemeToggleuses Tailwind classes (className="w-5 h-5"). For maintainability, consider migrating to a consistent approach—either Tailwind throughout (leveragingdark:variants for theming) or CSS modules.
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app/page.tsx (5)
4-13: LGTM!Well-defined TypeScript interfaces for the theme context and provider props.
28-39: SSR handling looks good.The SSR safety check addresses the previous concern. Note that
useEffectonly runs on the client, so thetypeof window === 'undefined'check on line 30 is technically redundant but doesn't cause harm.
94-119: LGTM!Good hydration handling with the mounted guard, and the dynamic
aria-labelproperly describes the action for screen readers.
121-134: LGTM!The styles object correctly uses CSS variables for theme-aware styling.
136-143: LGTM!Clean composition pattern with the provider wrapping the content.
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Actionable comments posted: 1
🧹 Nitpick comments (2)
app/page.tsx (2)
36-38: Unsafe type assertion on localStorage value.The cast
as 'light' | 'dark' | nullassumes localStorage always contains valid values. If the stored value is corrupted or tampered with, this could lead to unexpected behavior.Consider validating the stored value:
- const stored = localStorage.getItem('theme') as 'light' | 'dark' | null; - const initial = stored || + const storedRaw = localStorage.getItem('theme'); + const stored = storedRaw === 'light' || storedRaw === 'dark' ? storedRaw : null; + const initial = stored ?? (window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light');
139-155: Multiple<h1>elements affect accessibility and SEO.There are two
<h1>tags: "hodlCoin" in the header (line 139) and "hodlCoin Staking Platform" in the hero section (line 154). For proper document structure, a page should have a single<h1>.Consider demoting the header title to an appropriate heading level or using a different element:
- <h1 className="text-2xl font-bold m-0">hodlCoin</h1> + <span className="text-2xl font-bold">hodlCoin</span>Or alternatively, make the hero
<h1>an<h2>if the site title should be the primary heading.
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app/page.tsx
[error] 277-277: Expected a semicolon or an implicit semicolon after a statement, but found none
An explicit or implicit semicolon is expected here...
...Which is required to end this statement
(parse)
[error] 277-277: Expected a semicolon or an implicit semicolon after a statement, but found none
An explicit or implicit semicolon is expected here...
...Which is required to end this statement
(parse)
[error] 277-277: Expected a semicolon or an implicit semicolon after a statement, but found none
An explicit or implicit semicolon is expected here...
...Which is required to end this statement
(parse)
[error] 277-277: Expected an expression, or an assignment but instead found the end of the file.
Expected an expression, or an assignment here.
(parse)
🔇 Additional comments (6)
app/page.tsx (6)
1-3: LGTM!The
'use client'directive is correctly placed at the top, and the imports are appropriate for the theme management functionality.
6-14: LGTM!Good TypeScript definitions with properly constrained theme type and correct
React.ReactNodetyping for children.
17-17: LGTM!Using
nullas the default context value enables theuseThemehook to properly detect and throw when used outside the provider.
66-73: LGTM!The hook correctly throws a descriptive error when used outside
ThemeProvider, which is now effective since the context default isnull.
76-110: LGTM!Well-implemented theme toggle with proper loading state handling, dynamic
aria-labelfor accessibility, and consistent styling.
116-122: LGTM!Correct page structure with
ThemeProviderwrapping the content.
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Actionable comments posted: 3
🧹 Nitpick comments (1)
app/page.tsx (1)
112-119: Consider moving theme wiring out ofapp/page.tsxto avoid a fully client-rendered page.
Having'use client'at the page level typically forces this route to lean heavily on client-side rendering; best practice is usually: keepapp/page.tsxserver, and mount a small clientThemeProvider/ThemeTogglecomponent inapp/layout.tsx(or a dedicated client wrapper).
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app/page.tsx (2)
1-18: Clean, typed setup for a client-side theme context.
Types +createContext<... | null>(null)+'use client'are consistent and avoid the earlier SSR/context pitfalls.
129-270: UI structure reads well and the dark-mode Tailwind styling is consistent.
Header placement of the toggle is clear; overall composition looks coherent.
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🧹 Nitpick comments (4)
app/page.tsx (4)
1-3: Consider avoiding page-level'use client'to keep the route mostly Server Components (bundle/perf).
Right now the entireapp/page.tsxis forced into a Client Component, which can unnecessarily increase client JS and prevents using server-only features in this route. A common pattern is: keepapp/page.tsxas a Server Component and moveThemeProvider/ThemeToggleinto a separate*.client.tsxmodule that’s imported and rendered from the page.
24-31:setRootClassis correct; consider reducing global transition side-effects.
Addingtransition-colors duration-300on<html>affects everything and is applied on every toggle; if you only want the page container to animate, you can drop the global add (you already have transitions on the main wrapper).
34-54: Init logic is robust; remaining UX gap is potential “flash” before hydration for dark-pref users.
Because thedarkclass is applied only after mount, users who prefer dark (or have stored dark) can briefly see the light theme until hydration completes. If this matters for the landing page, consider setting the initial theme class pre-hydration (layout-level inline script or cookie-driven<html class>).
58-73: Avoid side effects inside thesetThemeupdater (keep it pure).
This is currently “safe enough” (idempotent), but it’s cleaner under React concurrency semantics to compute state in the updater and run DOM/storage side-effects in an effect that reacts tothemechanges.const toggleTheme = (): void => { - setTheme((prev) => { - const next = prev === 'light' ? 'dark' : 'light'; - setRootClass(next); - - try { - if (typeof window !== 'undefined') { - localStorage.setItem('theme', next); - } - } catch { - // Ignore storage write failures - } - return next; - }); + setTheme((prev) => (prev === 'light' ? 'dark' : 'light')); }; + + useEffect(() => { + if (!mounted || typeof window === 'undefined') return; + setRootClass(theme); + try { + localStorage.setItem('theme', theme); + } catch { + // ignore storage write failures + } + }, [theme, mounted]);
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app/page.tsx (4)
6-18: Context typing +nulldefault are solid.
createContext<ThemeContextType | null>(null)+ the throwinguseThemeguard is the right shape.
83-89:useThemeguard is correct.
Clear error message and correct null handling.
92-127: ThemeToggle UX/a11y looks good (loading state,type="button", dynamic aria-label).
No issues spotted in the toggle rendering or interaction.
132-288: Page no longer blanks on mount; layout is SSR-friendly again.
Good call removing the “blank until mounted” return and limiting mount-gating to the toggle UI.
2 participants
…icon for light mode and a moon icon for dark mode.
Updated toogle button
Summary by CodeRabbit
New Features
Refactor
Style
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