TypeScript Performance Best Practices

Comprehensive performance optimization guide for TypeScript codebases. Contains 43 rules across 8 categories, prioritized by impact to guide automated refactoring and code generation.

When to Apply

Reference these guidelines when:

• Writing or refactoring TypeScript code
• Tuning build times, type-checking performance, declaration emit, or editor responsiveness
• Investigating performance regressions
• Reviewing code for performance issues
• Configuring tsconfig.json for new projects or monorepos

Quick Diagnostic Workflow

When TypeScript feels slow, follow this diagnostic sequence: