---
title: "Hook called inside a JSX expression, `&&`, ternary or callback (lint/conditional-hook)"
description: "lint/conditional-hook: `{mode === 'gradient' && <motion.div style={{ background: useMotionTemplate`…` }} />}` (Magic UI magic-card) or `style={{ y:…"
canonical: https://void-design.vercel.app/rules/lint/conditional-hook
lastModified: 2026-09-16
---

# Hook called inside a JSX expression, `&&`, ternary or callback

`lint/conditional-hook` · severity **error** · category Lint · detected by `void lint` and `void audit`

## Why it matters

`{mode === 'gradient' && <motion.div style={{ background: useMotionTemplate`…` }} />}` (Magic UI magic-card) or `style={{ y: useTransform(…) }}` (Skiper19) changes hook order when the condition flips; React throws "Rendered more hooks than during the previous render".

## How to fix it

Call every hook unconditionally at the top of the component and use the result conditionally.

## Example

```tsx
const background = useMotionTemplate`radial-gradient(${size}px at ${x}px ${y}px, var(--brand-subtle), transparent)`;
return mode === 'gradient' ? <motion.div style={{ background }} /> : null;
```

## References

- https://react.dev/reference/rules/rules-of-hooks

## More lint rules

`void lint` reports 67 rules in this category. Static source checks with no browser: Tailwind v4 silent failures, Next.js 16 API traps, React render-body bugs, accessibility markup, SEO files and motion hygiene.

- `route-js-budget` Route first-load JS over budget (from `.next` build output) — [lint/route-js-budget](https://void-design.vercel.app/rules/lint/route-js-budget)
- `animate-undefined` `animate-*` class with no matching `--animate-*` theme variable or `@keyframes` — [lint/animate-undefined](https://void-design.vercel.app/rules/lint/animate-undefined)
- `random-in-render` `Math.random()` / `Date.now()` / `new Date()` evaluated in a component render body — [lint/random-in-render](https://void-design.vercel.app/rules/lint/random-in-render)
- `duplicate-children-not-hidden` Children repeated for a marquee/loop without `aria-hidden` or `inert` on the copies — [lint/duplicate-children-not-hidden](https://void-design.vercel.app/rules/lint/duplicate-children-not-hidden)
- `svg-global-id` Hardcoded `id` on an SVG `<filter>`, gradient, `<clipPath>` or `<mask>` inside a reusable component — [lint/svg-global-id](https://void-design.vercel.app/rules/lint/svg-global-id)
- `allocation-per-frame` `new Intl.NumberFormat` / `Intl.NumberFormat(` / `new Color(` inside an animation-frame callback — [lint/allocation-per-frame](https://void-design.vercel.app/rules/lint/allocation-per-frame)
- `setstate-per-pointer-move` React state set inside a `mousemove` / `pointermove` / `scroll` handler — [lint/setstate-per-pointer-move](https://void-design.vercel.app/rules/lint/setstate-per-pointer-move)
- `hardcoded-device-pixel-ratio` Canvas/WebGL renders with a literal `devicePixelRatio: 2` (or `width * 2`) — [lint/hardcoded-device-pixel-ratio](https://void-design.vercel.app/rules/lint/hardcoded-device-pixel-ratio)

Detected by `void lint` and `void audit`. Explain it in a terminal: `void rules lint/conditional-hook`