typescript

name

typescript

description

TypeScript performance, tsconfig, type errors, async patterns — triggered when the user asks to "optimize TypeScript performance", "speed up tsc compilation", "configure tsconfig.json", "fix type errors", "improve async patterns", or encounters TS errors (TS2322, TS2339, "is not assignable to"). Also triggers on .ts, .tsx, .d.ts file work involving type definitions, module organization, or memory management. Does NOT cover TypeScript basics, framework-specific patterns, or testing.

TypeScript Best Practices

Comprehensive performance optimization guide for TypeScript applications. Contains 45 rules across 8 categories, prioritized by impact to guide automated refactoring and code generation.

When to Apply

Reference these guidelines when:

• Configuring tsconfig.json for a new or existing project
• Writing complex type definitions or generics
• Optimizing async/await patterns and data fetching
• Organizing modules and managing imports
• Reviewing code for compilation or runtime performance

Rule Categories by Priority

Priority	Category	Impact	Prefix
1	Type System Performance	CRITICAL	type-
2	Compiler Configuration	CRITICAL	tscfg-
3	Async Patterns	HIGH	async-
4	Module Organization	HIGH	module-
5	Type Safety Patterns	MEDIUM-HIGH	safety-