A lightweight set of TypeScript utility types for advanced type-level transformations.

This package provides strongly-typed helpers to extract values and keys from deeply nested object types, and to convert deeply readonly structures into mutable ones — all while preserving important primitives and special types like Date, Function, and arrays.

🚀 Features

• ValuesOf<T> – Extract all terminal value types from nested object types
• KeysOf<T> – Extract all terminal key types from nested object types
• Mutable<T> – Recursively remove readonly from nested types
• IndexOf<T> – Extracts the numeric index types from a tuple or fixed-length array
• Smart handling of special types (Date, Function, arrays, etc.)

📦 Installation

npm install @virtual-registry/ts-utils
# or
yarn add @virtual-registry/ts-utils