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type-fest

npmv5.9.0TypeScript

A collection of essential TypeScript types

Safe to adopt

Yes — type-fest scores well across adoption, maintenance, weight, supply chain, and licensing. 385.6M downloads per week and 6 known dependents. Last published 10 days ago. 39 releases in the last 2 years.

  • AAdoption: grade A, Excellent.

    385.6M downloads per week and 6 known dependents.

  • AMaintenance: grade A, Excellent.

    Last published 10 days ago. 39 releases in the last 2 years.

  • AWeight: grade A, Excellent.

    Pulls in 1 transitive package, about 563 KB installed.

  • BSupply chain: grade B, Good.

    This package has a single maintainer (bus factor of 1).

  • ALicense: grade A, Excellent.

    (MIT OR CC0-1.0) — permissive, with no copyleft found in the dependency tree.

Grades are computed deterministically from registry metadata collected by PackageGraph — downloads, dependents, publish dates, the resolved dependency tree, maintainer count, and declared licenses. No third-party scores are used.

Install cost

What you actually take on by adding type-fest to a project.

1
Direct dependencies

Runtime packages this one declares itself.

1
Total installed

Distinct packages in the full runtime tree, deduplicated the way a package manager would.

563 KB
Install size

Unpacked size of this package plus its entire runtime tree.

1
Tree depth

Longest resolved dependency chain below this package.

Licenses in the dependency tree

MIT

Every license you inherit by installing type-fest, not just its own. Check this before a legal review, not after.

Compatibility

Node.js
node >=20
Module format
ESM only
TypeScript
Types included
Install scripts
None

Quick start

A usage example from the type-fest README.

tsFull README ↗
import type {Except} from 'type-fest';

type Foo = {
	unicorn: string;
	rainbow: boolean;
};

type FooWithoutRainbow = Except<Foo, 'rainbow'>;
//=> {unicorn: string}

type-fest vs the alternatives

Packages solving a similar problem in the npm ecosystem, compared on the signals that drive an adoption decision.

PackageWeekly downloadsDependentsLicenseLast release
type-festthis page385.6M6(MIT OR CC0-1.0)10 days ago
json-schema-typed01BSD-2-Clause6 days ago
csstype160.9M2MIT5 days ago
ts-node49.4M38MIT6 days ago
meow42.8M1MIT5 days ago
drizzle-orm20.3M0Apache-2.06 days ago

Dependencies

Declared by type-fest v5.9.0. Runtime dependencies are installed with the package; dev dependencies are not.

Runtime (1)

tagged-tag ^1.0.0

Dev (13)

@eslint/markdown ^8.0.1@sindresorhus/tsconfig ^8.0.1@types/node ^25.5.0@typescript-eslint/parser ^8.44.0@typescript/vfs ^1.6.1dedent ^1.7.0eslint ^10.1.0expect-type ^1.2.2npm-run-all2 ^8.0.4tsd ^0.33.0typescript ^5.9.2typescript-eslint ^8.47.0xo ^2.0.2

Used by

Popular packages that depend on type-fest.

meownpm

CLI app helper

↓ 42.8M/wk◈ 1 dependents⚖ MIT
serialize-errornpm

Serialize/deserialize an error into a plain object

↓ 32.8M/wk◈ 2 dependents⚖ MITTS
mswnpm

Seamless REST/GraphQL API mocking library for browser and Node.js.

↓ 0/wk◈ 5 dependents⚖ MITTS
parse-jsonnpm

Parse JSON with more helpful errors

↓ 0/wk◈ 2 dependents⚖ MITTS
locate-appnpm

Find apps installed on your system. This util will help to find executables of a known app like Chrome, Firefox,... on Windows, Linux, and macOS out of the box.

↓ 0/wk◈ 1 dependents⚖ Apache-2.0TS
stacktrace-parsernpm

Parses every stack trace into a nicely formatted array of hashes.

↓ 0/wk◈ 4 dependents⚖ MITTS

Relationship graph

Dependencies (left) and dependents (right) of type-fest.

tagged-tagmeowserialize-errormswparse-jsonlocate-appstacktrace-parsertype-fest
type-fest dependencies dependents

Frequently installed together

prettiernpm

Prettier is an opinionated code formatter

↓ 132.4M/wk◈ 159 dependents⚖ MITTS
esbuildnpm

An extremely fast JavaScript and CSS bundler and minifier.

↓ 275.2M/wk◈ 40 dependents⚖ MITTS
yargs-parsernpm

the mighty option parser used by yargs

↓ 258M/wk◈ 2 dependents⚖ ISC
path-to-regexpnpm

Express style path to RegExp utility

↓ 216.6M/wk◈ 2 dependents⚖ MITTS
undicinpm

An HTTP/1.1 client, written from scratch for Node.js

↓ 172.9M/wk◈ 15 dependents⚖ MITTS
eslintnpm

An AST-based pattern checker for JavaScript.

↓ 159.4M/wk◈ 277 dependents⚖ MITTS
expressnpm

Fast, unopinionated, minimalist web framework

↓ 132.9M/wk◈ 17 dependents⚖ MIT
axiosnpm

Promise based HTTP client for the browser and node.js

↓ 123.2M/wk◈ 4 dependents⚖ MITTS
indent-stringnpm

Indent each line in a string

↓ 106.5M/wk◈ 2 dependents⚖ MIT
vitestnpm

Next generation testing framework powered by Vite

↓ 99.9M/wk◈ 127 dependents⚖ MITTS
decamelizenpm

Convert a camelized string into a lowercased one with a custom separator: unicornRainbow → unicorn_rainbow

↓ 72.2M/wk◈ 4 dependents⚖ MITTS
webpacknpm

Packs ECMAScript/CommonJs/AMD modules for the browser. Allows you to split your codebase into multiple bundles, which can be loaded on demand. Supports loaders to preprocess files, i.e. json, jsx, es7, css, less, ... and your custom stuff.

↓ 56.4M/wk◈ 29 dependents⚖ MITTS

Release history

34 releases in the last two years, typically about 21 days apart.

Recent versions of type-fest
VersionPublishedSizeLicense
5.9.0latest10 days ago561 KB(MIT OR CC0-1.0)
5.8.02 months ago556 KB(MIT OR CC0-1.0)
5.7.03 months ago546 KB(MIT OR CC0-1.0)
5.6.04 months ago538 KB(MIT OR CC0-1.0)
5.5.05 months ago527 KB(MIT OR CC0-1.0)
5.4.47 months ago512 KB(MIT OR CC0-1.0)
5.4.37 months ago512 KB(MIT OR CC0-1.0)
5.4.27 months ago513 KB(MIT OR CC0-1.0)
5.4.17 months ago512 KB(MIT OR CC0-1.0)
5.4.08 months ago512 KB(MIT OR CC0-1.0)
5.3.19 months ago499 KB(MIT OR CC0-1.0)
5.3.09 months ago499 KB(MIT OR CC0-1.0)
5.2.010 months ago495 KB(MIT OR CC0-1.0)
5.1.011 months ago486 KB(MIT OR CC0-1.0)
5.0.111 months ago471 KB(MIT OR CC0-1.0)

Overview

type-fest is an npm package that a collection of essential TypeScript types. It is extremely widely used, with about 385.6M downloads per week and 6 known dependents in the graph. The latest version is 5.9.0, released under the (MIT OR CC0-1.0) license.

Who should use it

Teams working in the npm ecosystem who need a collection of essential TypeScript types and value a battle-tested, widely-adopted solution.

When not to use it

Consider an alternative if you need to or if a more actively-maintained option better fits your npm stack.

Pros

  • Large, well-established user base (385.6M weekly downloads).
  • Ships TypeScript type definitions.
  • Clear open-source license ((MIT OR CC0-1.0)).

Cons

  • No significant drawbacks detected from available metadata.

Auto-generated from collected registry metadata. No external claims are inferred.

Maintainers

sindresorhus

Keywords

genericsjsonmergeomittstypestypescriptutilutilitiesutility

Funding

Frequently asked questions

Should I use type-fest?

Yes — type-fest scores well across adoption, maintenance, weight, supply chain, and licensing. 385.6M downloads per week and 6 known dependents. Last published 10 days ago. 39 releases in the last 2 years.

How do I install type-fest?

Run `npm install type-fest` to add type-fest to your npm project.

How many dependencies does type-fest have?

type-fest declares 14 direct dependencies and pulls in 1 packages in total once its runtime tree is resolved totalling about 563 KB on disk.

What license is type-fest released under?

type-fest is distributed under the (MIT OR CC0-1.0) license.

How popular is type-fest?

type-fest has approximately 385,587,178 downloads per week and 6 known dependent packages.

Is type-fest still maintained?

The most recent release of type-fest (v5.9.0) was published 10 days ago.

Does type-fest run install scripts?

No. type-fest does not define preinstall, install, or postinstall scripts, so installing it does not execute publisher-supplied code.