Modern TypeScript Patterns That Scale
How to use discriminated unions, utility types, and runtime-safe parsing to keep large TypeScript projects maintainable.
January 29, 2026
5 min read
Anand Jaiswal
TypeScriptCode QualityPatterns
TypeScript scales best when your domain model is explicit.
Use Discriminated Unions
They make impossible states impossible by construction.
- Keep the discriminator field stable.
- Narrow types close to usage sites.
Separate Data Shapes
Define transport DTOs separately from domain models. Validate external input before use.
Teams move faster when code feels predictable.
Standardize Conventions
Prefer a small set of project-wide patterns over many one-off abstractions.