Add Zod wildcard import best practice for tree-shaking

[Copilot]

Zod PR #4569 documents that wildcard imports (import * as z from "zod") enable proper tree-shaking in Webpack/Next.js and esbuild, while named imports (import { z } from "zod") prevent unused code elimination in these bundlers.

Changes

• New rule: bundle-zod-wildcard-import.md under Bundle Size Optimization (section 2.6)
• Updated: SKILL.md quick reference and AGENTS.md compiled documentation
• Rule count: 57 → 58

Example

// ❌ Not tree-shakable by Webpack/esbuild
import { z } from 'zod'

// ✅ Tree-shakable across all bundlers
import * as z from 'zod'

const userSchema = z.object({
  name: z.string(),
  email: z.string().email()
})

Rollup handles both patterns, but Webpack (including Next.js) and esbuild require the wildcard pattern to properly exclude unused validators, locales, and internal utilities.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• zod.dev
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

Add colinhacks/zod#4569 as a react best practice rule

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
v0-agent-skills-ns	Error	Open in v0	Feb 2, 2026 10:35am