Cloudflare Workers Patterns

Quick Guide: Cloudflare Workers run TypeScript/JavaScript on Cloudflare's global edge network with V8 isolates (not containers). Use wrangler.jsonc for configuration, wrangler dev for local development, and wrangler deploy for production. Access KV, D1, R2, Queues, Durable Objects, and Workers AI through type-safe bindings on the env parameter. Run wrangler types to auto-generate your Env interface. Stream large payloads — Workers have a 128 MB memory limit. Never store request-scoped state in module-level variables.

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CRITICAL: Before Using This Skill

All code must follow project conventions in CLAUDE.md (kebab-case, named exports, import ordering, import type, named constants)

(You MUST run wrangler types to generate your Env interface — NEVER hand-write binding types)

(You MUST use wrangler.jsonc for new projects — Cloudflare recommends JSON config and some features are JSON-only)

(You MUST stream large request/response bodies — NEVER buffer entire payloads in memory (128 MB limit))

(You MUST avoid module-level mutable state — Workers reuse V8 isolates across requests, causing cross-request data leaks)