typescript

Enforce strict TypeScript patterns with const types, flat interfaces, and type guards.

Updated Aug 27, 2026

Search Tags:#typescript #interfaces #patterns #type-safety #types #generics

Ready to run

npx skills add https://github.com/stephanofer/finance-trackerv2 --skill typescript-stephanofer

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Please help me install this Agent Skill.
Skill: typescript
Source: https://github.com/stephanofer/finance-trackerv2/tree/main/.opencode/skill/typescript
Command: npx skills add https://github.com/stephanofer/finance-trackerv2 --skill typescript-stephanofer

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill guides TypeScript authors toward strict, maintainable patterns to reduce runtime and compile-time errors.

Core Features & Use Cases

Const Types Pattern: Create const objects and extract types to ensure a single source of truth at runtime.
Flat Interfaces: Favor one-level deep interfaces for readability and reliability.
Never Use any: Advocate for unknown and generics to enforce safety.
Type Guards & Utilities: Use type guards and TypeScript utility types to model and validate data shapes.
Use Case: When designing a library API or large frontend app, apply these patterns to improve type safety and developer experience.

Quick Start

Refactor a sample interface to use a const-based type and flat interfaces; implement a safe type guard and a small set of utilities to illustrate the pattern.

Frequently Asked Questions about typescript

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I enforce type safety in a large frontend application?▼

You can enforce type safety by applying strict TypeScript patterns like const-based types, flat interfaces, and safe type guards to reduce runtime and compile-time errors across modules.

What is the best way to replace any with safer types in TypeScript?▼

To replace any, advocate for the unknown type and generics to enforce safety, combined with type guards to model and validate data shapes reliably.

How do I create a single source of truth for runtime types and interfaces?▼

Create a single source of truth at runtime by using the const types pattern, which involves creating const objects and extracting types to ensure consistency across your application.

Why should I use flat interfaces over nested ones in TypeScript?▼

Use flat interfaces favoring one-level deep structures because they improve readability and reliability, making it easier to manage consistent types across large frontend apps.

Can I use these TypeScript patterns for designing a library API?▼

Yes, you can use these strict TypeScript patterns when designing a library API or large frontend app to improve type safety, consistency, and the overall developer experience.

What are the limitations of using strict type guards and flat interfaces?▼

Strict type guards and flat interfaces require adherence to documented patterns and tooling guidance, which may introduce a learning curve and limit ad-hoc typing flexibility in complex modules.