TypeScript Mastery

Description

Advanced TypeScript patterns for professional-grade applications. Covers branded types for nominal typing, discriminated unions for state machines, template literal types for DSLs, generics with constraints, utility type composition, custom type guards, and performance-tuned tsconfig.json settings. Also includes a practical incremental migration strategy from JavaScript. TypeScript is the #1 language on GitHub in 2026 with 80%+ adoption in new projects.

Usage

Install this skill to get advanced TypeScript patterns including:

• Branded types to prevent mixing structurally identical types (UserId vs OrderId)
• Discriminated unions with exhaustiveness checking for state machines
• Template literal types for type-safe API routes and event names
• tsconfig.json settings that reduce compilation time by 30-50%
• Incremental migration strategy from JavaScript to TypeScript