Cloudflare Workers Dev Experience

If you're setting up Cloudflare Workers locally or debugging why your bindings aren't working in dev mode, this gets you sorted. It walks through Wrangler configuration, proper TypeScript setup with the right module resolution settings, and handling preview IDs for KV and D1 so you stop seeing "undefined" errors. The security section on supply chain practices for scaffolding tools is a nice touch, especially the cooldown period advice. Most helpful when you're either bootstrapping a new worker project or troubleshooting why hot reload isn't picking up changes. The error prevention table covering the top six issues (binding configs, HMR, CORS) will save you from the usual local dev headaches.

skills.sh installs: 317
GitHub stars: 248
last updated: Aug 21, 2026

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Install

$ npx -y skills add secondsky/claude-skills --skill cloudflare-workers-dev-experience --agent claude-code

Installs into .claude/skills of the current project.

Files

Cloudflare Workers Developer Experience

Local development setup with Wrangler, Miniflare, and modern tooling.

Quick Start

# Create new project
bunx create-cloudflare@latest my-worker

# Or from scratch
mkdir my-worker && cd my-worker
bun init -y
bun add -d wrangler @cloudflare/workers-types

# Start local development
bunx wrangler dev

Secure Installation

Scaffolding tools like bunx create-cloudflare download and execute remote code. Before running, follow supply chain security best practices:

Block post-install scripts — npm config set ignore-scripts true (or Bun: disabled by default)
Cooldown period — Wait 7 days for new package versions to be vetted by the community
Audit before installing — Run socket package score npm <pkg> or use socket npm install <pkg> to check packages

Load the dependency-upgrade skill for full security configuration including Socket CLI integration, cooldown setup, lockfile validation, and CI enforcement.

Essential wrangler.jsonc

{
  "$schema": "node_modules/wrangler/config-schema.json",
  "name": "my-worker",
  "main": "src/index.ts",
  "compatibility_date": "2024-12-01",

SKILL.md on GitHub

Details

Repository: github.com/secondsky/claude-skills
Categories: Debugging, Cloud & Infrastructure
First seen: Jun 3, 2026