Boost TypeScript with Type-Fest

Type-Fest is a powerful collection of essential TypeScript utility types that go beyond the standard library.
Developed by the open-source community, this toolkit helps developers write more reliable, type-safe, and maintainable code with less effort.

Why Use Type-Fest?​

The TypeScript standard library provides many built-in types - but sometimes, you need more flexibility.
That’s where Type-Fest comes in, offering high-quality, reusable types for everyday coding scenarios.

These types help:
Improve code readability and consistency
Prevent common type errors
Save time by avoiding repetitive type definitions

Key Features​

Here are a few examples of what Type-Fest includes:

• PartialDeep<T> - Make all properties in an object recursively optional.
• Jsonify<T> - Convert any TypeScript type to a valid JSON type.
• PackageJson - Type definition for a package.json file.
• Merge<T, U> - Combine two types into one unified type.

Each utility type is thoroughly tested, well-documented, and lightweight - making it ideal for both small projects and enterprise-scale apps.

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Installation & Usage​

You can add Type-Fest to your project easily via npm or yarn:

npm install type-fest
# or
yarn add type-fest

Then import the utilities you need:

import { Merge } from 'type-fest';

type User = { name: string };
type Account = { email: string };

type UserProfile = Merge<User, Account>;
// Result: { name: string; email: string }

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Learn More​

Want to explore all available types?
Check out the official GitHub repository here:
https://github.com/sindresorhus/type-fest