typescript

Generate strict TypeScript types, const unions, and type guards.

Updated Mar 23, 2026
One-click install
npx skills add https://github.com/giruclawbot/giru-backup --skill typescript-giruclawbot
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: typescript
Source: https://github.com/giruclawbot/giru-backup/tree/main/skills/typescript
Command: npx skills add https://github.com/giruclawbot/giru-backup --skill typescript-giruclawbot

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Prevents fragile, loosely-typed TypeScript code that causes runtime errors, poor autocomplete, and costly refactors by prescribing consistent, strict typing patterns for values, interfaces, and guards.

Core Features & Use Cases

  • Const Types Pattern: define runtime value maps as const objects and derive union types from them to keep a single source of truth and enable autocomplete.
  • Flat Interfaces & Referenced Nested Types: keep interfaces one level deep and reference nested objects via dedicated interfaces to improve reuse and readability.
  • Safe Typing Practices: prefer unknown and generics over any, provide type guards for runtime validation, and demonstrate common utility type usages for transformations.
  • Use Case: apply these patterns when authoring new TypeScript modules, performing code reviews to enforce strict mode, or migrating loose JavaScript code to typed equivalents.

Quick Start

Generate strict TypeScript types and type guards for the following JSON payload using const value maps for unions, separate referenced interfaces for nested objects, and unknown-safe parsing functions.

Frequently Asked Questions about typescript

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

FAQPage Schema
What is the best way to prevent runtime type errors in TypeScript?

To prevent TypeScript runtime type errors, enforce strict typing patterns using const-based unions, unknown-safe parsers, and type guards for runtime validation. This approach shifts error detection to compile time.

How do I define TypeScript union types from a single source of truth?

Define TypeScript union types from a single source of truth by creating const objects as runtime value maps and deriving unions from them. This pattern enables autocomplete and ensures values stay synchronized.

How do I structure TypeScript interfaces for nested objects?

Structure TypeScript interfaces for nested objects by keeping them one level deep and referencing dedicated interfaces for nested structures. This improves code reuse and readability across modules.

When should I use unknown instead of any in TypeScript?

Use unknown instead of any in TypeScript when parsing external data to ensure type safety. Combine unknown with type guards to perform runtime validation before assigning specific types.

Does strict mode in TypeScript work well with utility types and generics?

Strict mode in TypeScript works well with utility types and generics by enforcing safe transformations. Use generics to preserve type inference and utility types to map interfaces without losing strictness.