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Code guidelines for Cloudflare Worker implementations. Use when editing, reviewing, or executing a Cloudflare Worker; e.g. D1 queries, handlers, Wrangler commands, and Wrangler configurations.

Code guidelines for TSX files. Use when editing or reviewing `.tsx` files, i.e. TypeScript React components.

Code guidelines for JavaScript/TypeScript end-to-end, integration, and unit tests. Use when authoring or reviewing `**/*.test.ts` and `**/*.test.tsx` files, e.g. Playwright, Vitest.

TypeScript guidelines. Use when editing or reviewing `**/*.ts` and `**/*.tsx` files.

Use this skill to create a new design system.