type-fest

What problem does it solve?

This Skill provides over 180 compile-time TypeScript utility types to perform complex type transformations, deep object manipulation, and ensure strict type safety, going beyond built-in TypeScript utilities.

Core Features & Use Cases

• Strict Type Transformations: Deeply merge, pick, omit, and transform object types with compile-time safety.
• Data Schema Safety: Ensure type correctness for API payloads, configurations, and state management, especially with JSON serialization and case conversions.
• Use Case: When building a type-safe API client, use type-fest to automatically convert incoming snake_case JSON responses to camelCase TypeScript types, while also ensuring sensitive fields are omitted for public consumption.

Quick Start

Use the type-fest skill to create a type that recursively makes all properties of an interface optional.