# 4 Ultracite

> Skill: 4-ultracite

- Skill: `udecode/4-ultracite` (Agent Skill)
- Install (CLI): `npx skillmds@latest add udecode/4-ultracite`
- Raw SKILL.md: https://api.skillmd.com/api/skills/udecode/4-ultracite/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: udecode (https://skillmd.com/u/udecode)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/udecode/4-ultracite

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## Code Standards

When writing code in a project with Ultracite, follow these standards. For the full rules reference, see [references/code-standards.md](references/code-standards.md).

Key rules at a glance:

**Formatting:** 2-space indent, semicolons, double quotes, 80-char width, ES5 trailing commas, LF line endings.

**Style:** Arrow functions preferred. `const` by default, never `var`. `for...of` over `.forEach()`. Template literals over concatenation. No enums (use objects with `as const`). No nested ternaries. Kebab-case filenames.

**Correctness:** No unused imports/variables. No `any` (use `unknown`). Always `await` promises in async functions. No `console.log`/`debugger`/`alert` in production.

**React:** Function components only. Hooks at top level. Exhaustive deps. `key` on iterables (no array index). No nested component definitions. Semantic HTML + ARIA.

**Performance:** No accumulating spread in loops. No barrel files. Avoid namespace imports except `import * as z from "zod"` when it is required to keep deployed entry graphs tree-shakeable. Top-level regex.

**Security:** `rel="noopener"` on `target="_blank"`. No `dangerouslySetInnerHTML`. No `eval()`.