v5.4.4

Compare Source

• PackageJson: Use LiteralUnion for engines field (#​1354) fc9e2bb
• IsUnion: Fix behavior when the entire union extends all individual members (#​1353) b0321a5
• Paths: Fix leavesOnly behavior with never leaves (#​1350) 2c34128
• Paths: Fix behavior with WeakMaps / WeakSets (#​1348) ac3b50e
• Paths: Fix behavior with tuples containing optional elements with a rest element (#​1346) 7c82a21

v5.4.3

Compare Source

• Merge: Fix idempotency, so Merge<A, A> returns A (#​1336) 99e35a2
• Paths: Fix behavior with generic types (#​1343) 8f0419c

v5.4.2

Compare Source

• SimplifyDeep: Fix behavior with arrays (#​1337) a2a180d
• Merge: Fix behavior with unions (#​1327) fa55f48

v5.4.1

Compare Source

• MergeDeep: Remove extra undefined from optional properties (#​1319) a6af489

v5.4.0

Compare Source

New types

• ObjectMerge (#​1324) ac06066
• UnwrapPartial (#​1296) 99b0b07
• ArrayReverse (#​1266) dfbefad

v5.3.1

Compare Source

• PackageJson: Fix key type for DependencyOverrides (#​1307) 0430f56

v5.3.0

Compare Source

Improvements

• PackageJson: Add overrides (#​1287) 8beaa89

Fixes

• IsEqual: Fix generic inference (#​1306) f7b2667
• ConditionalPickDeep / SimplifyDeep: Prevent mapping over built-ins (#​1293) f14a75a
• ArraySlice / StringSlice: Fix behavior with unions (#​1291) 133258b

v5.2.0

Compare Source

v5.1.0

Compare Source

New types

• TupleOf (#​1247) 7fb2f75
• Xor (#​1254) ad04bc5
• SplitOnRestElement (#​1166) 34b8fad
• ExtractRestElement (#​1166) 34b8fad
• ExcludeRestElement (#​1166) 34b8fad

Improvements

• ReadonlyTuple: Deprecate in favor of TupleOf (#​1256) af4bebc
• TsConfigJson: Add missing lib enum values (#​1263) 72f491f
• TsConfigJson: Add rewriteRelativeImportExtensions (#​1262) 7d011ce

Fixes

• PartialDeep: Fix behavior with functions containing multiple call signatures (#​1259) 3bd9de6
• IsEqual: Fix behaviour when instantiated with never and unknown (#​1251) 785549f
• FixedLengthArray: Fix element type (#​1246) ee29ef7
• is-equal: Fix handling with intersecting wrapped types (#​1231) 5af60a1

v5.0.1

Compare Source

• Add missing exports 4f9c248

v5.0.0

Compare Source

Breaking

• This package is now pure ESM. Please read this.
• Require TypeScript 5.9 b5b0214
• Require Node.js 20 cc2b0f2
• Reminder: type-fest requires strict: true in your tsconfig.
• StringKeyOf: Rename to KeyAsString e492c9c
• ArrayTail: Enable preserveReadonly by default and remove the option b34b1d8
• CamelCase / CamelCasedProperties / CamelCasedPropertiesDeep / PascalCase / PascalCasedProperties / PascalCasedPropertiesDeep: Disable preserveConsecutiveUppercase by default 8226c1b
  • This aligns it with the general JavaScript naming convention.
• PartialDeep: Disable allowUndefinedInNonTupleArrays by default b3c4524
• Split: Enable strictLiteralChecks by default 544a846
• Paths: Default maxRecursionDepth 5 (was 10) 2ab5dec
• ObservableLike: Move to sub-export 2a1072e
• Deprecate If* types in favor of a single If 4c2151a

New types

• Alphanumeric — Single alphanumeric character (A–Z, a–z, 0–9). 484e030
• AllExtend — Evaluates to true if every element of a tuple/array extends U. c8c6d55
• ConditionalSimplify — Simplifies a type’s unions/intersections with opt-in controls. b7a4771
• ConditionalSimplifyDeep — Deep version of ConditionalSimplify that recurses into objects. b7a4771
• DigitCharacter — Single ASCII digit character (0–9). 484e030
• ExcludeStrict — Non-distributive, stricter variant of Exclude<T, U>. e6f62a2
• ExtendsStrict — Non-distributive A extends B check. d71242a
• ExtractStrict — Non-distributive, stricter variant of Extract<T, U>. 98d24fa
• IsLowercase — Evaluates to true if a string literal is all lowercase. afe132c
• IsNullable — Evaluates to true if T includes null. 5067e25
• IsOptional — Evaluates to true if T includes undefined. 5067e25
• IsOptionalKeyOf — Evaluates to true if property K of T is optional. 93728b5
• IsReadonlyKeyOf — Evaluates to true if property K of T is readonly. 93728b5
• IsRequiredKeyOf — Evaluates to true if property K of T is required. 93728b5
• IsUnion — Evaluates to true if T is a union type. b3d92ed
• IsUndefined — Evaluates to true if the type is exactly undefined. f7bc576
• IsUppercase — Evaluates to true if a string literal is all uppercase. afe132c
• LowercaseLetter — Single lowercase Latin letter (a–z). 484e030
• RemovePrefix — Removes a specified prefix from a string literal. 18a1c04
• UppercaseLetter — Single uppercase Latin letter (A–Z). 484e030

Improvements

• Jsonify: Handle unknown as JsonValue 642bb13
• SetRequired / SetOptional / SetReadonly: Handle functions with properties a5e45d4
• Schema: Preserve arrays/remove extraneous unions 8a96def; drop undefined for recurseIntoArrays 1cb955b
• ReadonlyKeysOf / WritableKeysOf: Add object constraint a6efbe0
• TsConfigJson: Add TypeScript 5.9 fields d2bda94

Fixes

• Or: Fix with boolean, never, any 42d6106
• And: Fix with boolean, never, any b38ac60
• IsStringLiteral: Fix uncollapsed unions, and tagged types eb37799 / d1b35c7
• Paths: Fix behavior with index signatures 9926e5d
• ConditionalKeys: Fix behavior with arrays and unions 4d7cc50
• RequiredDeep: Fix with undefined bfcdbc4
• Split: Fix template strings ending with interpolation 853b881
• ArrayTail: Fix fix non-tuple arrays f3aabd8
• Fix UnionMin and UnionMax d52d5e7

Meta

Huge thanks to all the contributors to this release, especially @​som-sm 🙌