npm · #19 most downloaded on npm

type-fest

5.10.01.4B downloads/mosindresorhus/type-fest ↗New releases in your daily digest, changelog included.

A collection of essential TypeScript types

Last release 14 days ago
17 Sep 2026
Ships fairly regularly
a new release about every 4 weeks
Nearly every release is documented
notes for 60 of the last 60 stable releases
Nothing withdrawn
no release was ever pulled
8 years old
194 releases · first in 2019

Release timeline

194 releases since 2019

20192020202120222023202420252026

Releases

2.13.024 May 2022Deprecated
Mutable still works and is now just a deprecated alias.
New types

Exact (#259) 9394d54

ReadonlyTuple (#383) f445cc6

Replace (#389) 5c793ce

Improvements

Rename Mutable to Writable (#398) 638d597

Mutable still works and is now just a deprecated alias.

Fixes

Fix deep properties of PackageJson and TsConfigJson (#269) f2aae51

https://github.com/sindresorhus/type-fest/compare/v2.12.2...v2.13.0
Open source →
2.12.231 Mar 2022
Get: Fix TypeScript 4.7 compatibility (#388) 6c7ac47
Get: Fix TypeScript 4.7 compatibility (#388) 6c7ac47

TsConfig: Add watchOptions field (#384) 7aa0605

Jsonify: Handle undefined in array (#310) 17b0235

https://github.com/sindresorhus/type-fest/compare/v2.12.1...v2.12.2

One column per quarter.

2.12.119 Mar 2022

PackageJson: Allow null targets in Exports type (#377) 25d0204

PackageJson: Allow null targets in Exports type (#377) 25d0204

https://github.com/sindresorhus/type-fest/compare/v2.12.0...v2.12.1

Open source →

2.12.019 Feb 2022

Add imports field in PackageJson type

Add imports field in PackageJson type (#365)

https://github.com/sindresorhus/type-fest/compare/v2.11.2...v2.12.0

Open source →

2.11.28 Feb 2022

Add node-addons in PackageJson export condition (#362) 947f637

Add node-addons in PackageJson export condition (#362) 947f637

https://github.com/sindresorhus/type-fest/compare/v2.11.1...v2.11.2

Open source →

2.11.131 Jan 2022

ReadonlyDeep: Fix handling of objects with call signatures (#359) db54028

ReadonlyDeep: Fix handling of objects with call signatures (#359) db54028
ReadonlyDeep: Fix sets and maps not getting immutable methods (#358) 0ff4461

https://github.com/sindresorhus/type-fest/compare/v2.11.0...v2.11.1

Open source →

2.11.027 Jan 2022

Add `InvariantOf` type (#352) dea70a4

Add InvariantOf type (#352) dea70a4
Add Schema type (#321) 3aabfbc
Get: Support read only arrays (#355) dc7043c

https://github.com/sindresorhus/type-fest/compare/v2.10.0...v2.11.0

Open source →

2.10.020 Jan 2022

Add `RemoveIndexSignature` type (#335) 8103238

Add RemoveIndexSignature type (#335) 8103238
Add StringKeyOf type (#344) 103966b
Skip Date and RegExp in "deep" types 3243e22 3cc721b
Extend Get to accept Path as string[] (#353) ca45956

https://github.com/sindresorhus/type-fest/compare/v2.9.0...v2.10.0

Open source →

2.9.06 Jan 2022

Add `LiteralToPrimitive` type (#340) ab210eb

Add LiteralToPrimitive type (#340) ab210eb
Jsonify: Allow partial types (#312) 600f0c2
Get: Add strict mode (#317) b9ace21

https://github.com/sindresorhus/type-fest/compare/v2.8.0...v2.9.0

Open source →

2.8.01 Dec 2021

Add `Float` type (#330) 7770489

Add Float type (#330) 7770489

https://github.com/sindresorhus/type-fest/compare/v2.7.0...v2.8.0

Open source →

2.7.030 Nov 2021

https://github.com/sindresorhus/type-fest/compare/v2.6.0...v2.7.0

Added some numeric types:

https://github.com/sindresorhus/type-fest/compare/v2.6.0...v2.7.0

Open source →

2.6.023 Nov 2021Deprecated

Deprecate PromiseValue type (#322) ab7386d

Add new values to the TsConfigJson type (#325) 1507f6f
Deprecate PromiseValue type (#322) ab7386d

https://github.com/sindresorhus/type-fest/compare/v2.5.4...v2.6.0

Open source →

2.5.417 Nov 2021

Fix DelimiterCase type incorrectly converting string to empty string (#320) 623814c

Fix DelimiterCase type incorrectly converting string to empty string (#320) 623814c

https://github.com/sindresorhus/type-fest/compare/v2.5.3...v2.5.4

Open source →

2.5.39 Nov 2021

Fix Join edge case when type inference fails (#314) e0e202c

Fix Join edge case when type inference fails (#314) e0e202c

https://github.com/sindresorhus/type-fest/compare/v2.5.2...v2.5.3

Open source →

2.5.227 Oct 2021

Fix handling of pascal case inputs in DelimiterCase (#302) 2b7ad9a

Fix handling of pascal case inputs in DelimiterCase (#302) 2b7ad9a
Mention more use-cases for the Simplify type (#297) 55ed9d1

https://github.com/sindresorhus/type-fest/compare/v2.5.1...v2.5.2

Open source →

2.5.117 Oct 2021

Work around TypeScript limitation with the PartialDeep type (#296) 065e764

Work around TypeScript limitation with the PartialDeep type (#296) 065e764

https://github.com/sindresorhus/type-fest/compare/v2.5.0...v2.5.1

Open source →

2.5.012 Oct 2021

Add `MultidimensionalArray` type (#277) a726d80

Add MultidimensionalArray type (#277) a726d80
Add MultidimensionalReadonlyArray type (#277) a726d80

https://github.com/sindresorhus/type-fest/compare/v2.4.0...v2.5.0

Open source →

2.4.011 Oct 2021

Improve the ObservableLike type (#279) 7645829

Improve the ObservableLike type (#279) 7645829

https://github.com/sindresorhus/type-fest/compare/v2.3.4...v2.4.0

Open source →

2.3.420 Sept 2021

Fix Except autocomplete (#268) 93fa71c

Fix Except autocomplete (#268) 93fa71c

https://github.com/sindresorhus/type-fest/compare/v2.3.3...v2.3.4

Open source →

2.3.317 Sept 2021

Fix support for readonly and generic arrays in the LastArrayElement type (#266) 8f70e88

Fix support for readonly and generic arrays in the LastArrayElement type (#266) 8f70e88

https://github.com/sindresorhus/type-fest/compare/v2.3.2...v2.3.3

Open source →

2.3.210 Sept 2021

Fix Except not working with generic properties (#263) ad02560

Fix Except not working with generic properties (#263) ad02560

https://github.com/sindresorhus/type-fest/compare/v2.3.1...v2.3.2

Open source →

2.3.110 Sept 2021

https://github.com/sindresorhus/type-fest/compare/v2.3.0...v2.3.1

Fix a filename a8c2818

https://github.com/sindresorhus/type-fest/compare/v2.3.0...v2.3.1

Open source →

2.3.010 Sept 2021

`RequireAllOrNone` (#254) 28199b0

New types

RequireAllOrNone (#254) 28199b0

Improvements

Accept non-JSON types with .toJSON() method in Jsonify type (#257) 09fb092
Support numbers in Join type (#258) a001611

https://github.com/sindresorhus/type-fest/compare/v2.2.0...v2.3.0

Open source →

2.2.05 Sept 2021

https://github.com/sindresorhus/type-fest/compare/v2.1.0...v2.2.0

Add Join type (#235) e9e5665

https://github.com/sindresorhus/type-fest/compare/v2.1.0...v2.2.0

Open source →

2.1.023 Aug 2021

Support readonly array in a few more places abb5b98 ae3e0c9

Support readonly array in a few more places abb5b98 ae3e0c9
Allow specifying value type in ObservableLike (#246) 8b3719d

https://github.com/sindresorhus/type-fest/compare/v2.0.0...v2.1.0

Open source →

2.0.06 Aug 2021

Add `Jsonify` type (#244) 5349d27

Breaking

Require TypeScript 4.2 a55ebee
Require Node.js 12.20 a55ebee

Improvements

Add Jsonify type (#244) 5349d27
Add Constructor type 49d0db8
Improve Class type 49d0db8
Improve Opaque type 7f63a6e

https://github.com/sindresorhus/type-fest/compare/v1.4.0...v2.0.0

Open source →

1.4.05 Aug 2021

Add `Includes` type (#217) bf4fc28

Add Includes type (#217) bf4fc28
Add missing stuff to TsConfigJson and PackageJson types (#241) 55426a0
Fix tuple index out of bounds type (#242) cf80add

https://github.com/sindresorhus/type-fest/compare/v1.3.0...v1.4.0

Open source →

1.3.031 Jul 2021

Add `Simplify` type (#238) 96f8d68

Add Simplify type (#238) 96f8d68

https://github.com/sindresorhus/type-fest/compare/v1.2.3...v1.3.0

Open source →

1.2.329 Jul 2021

Fix CamelCase with uppercase strings (#234) 7d1edb5

Fix CamelCase with uppercase strings (#234) 7d1edb5

https://github.com/sindresorhus/type-fest/compare/v1.2.2...v1.2.3

Open source →

1.2.28 Jul 2021

https://github.com/sindresorhus/type-fest/compare/v1.2.1...v1.2.2

Fix Split type (#226) a7fa37a

https://github.com/sindresorhus/type-fest/compare/v1.2.1...v1.2.2

Open source →

1.2.116 Jun 2021

Fix CamelCase behavior when value is in uppercase (#220) 10516fb

Fix CamelCase behavior when value is in uppercase (#220) 10516fb

https://github.com/sindresorhus/type-fest/compare/v1.2.0...v1.2.1

Open source →

1.2.01 Jun 2021

Add `ScreamingSnakeCase` type (#214) ebb5a2d

Add ScreamingSnakeCase type (#214) ebb5a2d

https://github.com/sindresorhus/type-fest/compare/v1.1.3...v1.2.0

Open source →

1.1.319 May 2021

Add @category JSDoc tag to improve reference docs generation (#209) 6b8bee7

Add @category JSDoc tag to improve reference docs generation (#209) 6b8bee7

https://github.com/sindresorhus/type-fest/compare/v1.1.2...v1.1.3

Open source →

1.1.218 May 2021

Add string[] to PackageJson.Exports (#210) c34bbd9

Add string[] to PackageJson.Exports (#210) c34bbd9

https://github.com/sindresorhus/type-fest/compare/v1.1.1...v1.1.2

Open source →

1.1.18 May 2021

https://github.com/sindresorhus/type-fest/compare/v1.1.0...v1.1.1

Fix missing type lib 2ac33c7

https://github.com/sindresorhus/type-fest/compare/v1.1.0...v1.1.1

Open source →

1.1.07 May 2021

Add PackageJson.PublishConfig type (#205) 305795c

Add PackageJson.PublishConfig type (#205) 305795c

https://github.com/sindresorhus/type-fest/compare/v1.0.2...v1.1.0

Open source →

1.0.213 Apr 2021

Add missing exports for some of the TypeScript 4.1-only types (#196) 73e9aa7

Add missing exports for some of the TypeScript 4.1-only types (#196) 73e9aa7

https://github.com/sindresorhus/type-fest/compare/v1.0.1...v1.0.2

Open source →

1.0.123 Mar 2021

Fix LastArrayElement type 8445521

Fix LastArrayElement type 8445521

https://github.com/sindresorhus/type-fest/compare/v1.0.0...v1.0.1

Open source →

1.0.022 Mar 2021Breaking

No breaking changes. It's 1.0.0 to mark its stability.

Add CamelCasedProps, CamelCasedPropsDeep, and many more types (#179) c043c25
Add LastArrayElement, Split, and Trim types (#159) 2f6aa0b

No breaking changes. It's 1.0.0 to mark its stability.

https://github.com/sindresorhus/type-fest/compare/v0.21.3...v1.0.0

Open source →

0.21.310 Mar 2021

Fix TS type reference (#187) ed5f3d3

Fix TS type reference (#187) ed5f3d3

https://github.com/sindresorhus/type-fest/compare/v0.21.2...v0.21.3

Open source →

0.21.222 Feb 2021

Fix export for Get type (#181) a65377b

Fix export for Get type (#181) a65377b

https://github.com/sindresorhus/type-fest/compare/v0.21.1...v0.21.2

Open source →

0.21.115 Feb 2021

Fix TypedArray type export (#180) ccb3013

Fix TypedArray type export (#180) ccb3013

https://github.com/sindresorhus/type-fest/compare/v0.21.0...v0.21.1

Open source →

0.21.012 Feb 2021

Add `Mutable` type (#157) 673c1aa

Add Get type (#153) e40e640
Add Mutable type (#157) 673c1aa
Improve readability of Merge result (#170) c0e163d

https://github.com/sindresorhus/type-fest/compare/v0.20.2...v0.21.0

Open source →

0.20.227 Nov 2020

Fix SnakeCase type issue (#161) 02ef179

Fix SnakeCase type issue (#161) 02ef179

https://github.com/sindresorhus/type-fest/compare/v0.20.1...v0.20.2

Open source →

0.20.125 Nov 2020

Fix incorrect path in import statements 242d2f0

Fix incorrect path in import statements 242d2f0

https://github.com/sindresorhus/type-fest/compare/v0.20.0...v0.20.1

Open source →

0.20.025 Nov 2020

Now requires TypeScript 3.4 or later (was 3.2 previously)

Breaking

Now requires TypeScript 3.4 or later (was 3.2 previously)

New types

These types require TypeScript 4.1 or later. You can still use the other types with TypeScript 3.4 or later.

https://github.com/sindresorhus/type-fest/compare/v0.19.0...v0.20.0

Open source →

0.19.016 Nov 2020

RequireAtLeastOne: Make other given keys optional (#142) 6110607

RequireAtLeastOne: Make other given keys optional (#142) 6110607

https://github.com/sindresorhus/type-fest/compare/v0.18.1...v0.19.0

Open source →

0.18.112 Nov 2020

Fix entry.d.ts missing exports (#143) 769e332

Fix entry.d.ts missing exports (#143) 769e332

https://github.com/sindresorhus/type-fest/compare/v0.18.0...v0.18.1

Open source →

0.18.013 Oct 2020

Add `SetReturnType` and `Asyncify` types (#127) 94a665f

Add SetReturnType and Asyncify types (#127) 94a665f

https://github.com/sindresorhus/type-fest/compare/v0.17.0...v0.18.0

Open source →

0.17.030 Sept 2020

Add `Entry` and `Entries` types (#130) 7714f57

Add Entry and Entries types (#130) 7714f57
Add IterableElement type (#110) 0e8f4e3
Make LiteralUnion type work for more types (#97) 37e2816
Make PackageJson type stricter (#128) bb0d215

https://github.com/sindresorhus/type-fest/compare/v0.16.0...v0.17.0

Open source →

0.16.027 Jun 2020

Make the PromiseValue type handle nested promises (#112) 577c2a2

Make the PromiseValue type handle nested promises (#112) 577c2a2

https://github.com/sindresorhus/type-fest/compare/v0.15.1...v0.16.0

Open source →

0.15.19 Jun 2020

Fix circular dependency (#111) 8634556

Fix circular dependency (#111) 8634556

https://github.com/sindresorhus/type-fest/compare/v0.15.0...v0.15.1

Open source →

0.15.026 May 2020

Add support for ESM exports in the PackageJson type (#109) a2e0058

Add support for ESM exports in the PackageJson type (#109) a2e0058

https://github.com/sindresorhus/type-fest/compare/v0.14.0...v0.15.0

Open source →

0.14.021 May 2020

Add `FixedLengthArray` type (#106) d08f010

Add FixedLengthArray type (#106) d08f010

https://github.com/sindresorhus/type-fest/compare/v0.13.1...v0.14.0

Open source →

0.13.18 Apr 2020

Fix AsyncReturnType type (#96) 42fc903

Fix AsyncReturnType type (#96) 42fc903

https://github.com/sindresorhus/type-fest/compare/v0.13.0...v0.13.1

Open source →

0.13.05 Apr 2020

Add `ValueOf` type (#81) 2ee5957

Add ValueOf type (#81) 2ee5957
Add Stringified type (#95) b9a23df

https://github.com/sindresorhus/type-fest/compare/v0.12.0...v0.13.0

Open source →

0.12.09 Mar 2020

Add `UnionToIntersection` type (#89) bed43c1

Breaking

Require Node.js 10 a5fb5a1

Improvements

Add UnionToIntersection type (#89) bed43c1

https://github.com/sindresorhus/type-fest/compare/v0.11.0...v0.12.0

Open source →

0.11.020 Feb 2020

Add `PromiseValue` type (#75) 7fe70fd

New types

Add PromiseValue type (#75) 7fe70fd
Add AsyncReturnType type (#78) ae34d9e
Add ConditionalKeys type (#76) 8a908a3
Add ConditionalPick type (#76) 8a908a3
Add ConditionalExcept type (#76) 8a908a3

Enhancements

Allow all keys to be optional in the JsonObject type (#65) 6c105fb
Add workspaces to PackageJson type (#77) 836ecb8

https://github.com/sindresorhus/type-fest/compare/v0.10.0...v0.11.0

Open source →

0.10.031 Jan 2020

Add `TsConfigJson` type (#73) f98cd80

Add TsConfigJson type (#73) f98cd80
Make the Opaque type optionally stricter (#71) 3ba4cc1 See the discussion in https://github.com/sindresorhus/type-fest/issues/70.

https://github.com/sindresorhus/type-fest/compare/v0.9.0...v0.10.0

Open source →

0.9.024 Jan 2020

Add more fields to the PackageJson type 5808be4 c96a49d

Add more fields to the PackageJson type 5808be4 c96a49d

https://github.com/sindresorhus/type-fest/compare/v0.8.1...v0.9.0

Open source →

Your coding agent can read these notes before it upgrades. Set up the MCP server →

type-fest

Release timeline

Releases

New types

Improvements

Fixes

New types

Improvements

Breaking

Improvements

Breaking

New types

Breaking

Improvements

New types

Enhancements