toss/es-toolkit v1.51.0

on GitHub

Released on August 17th, 2026.

• Added the es-toolkit/bigint entrypoint: bigint counterparts of the math functions (sum, sumBy, max, min, maxBy, minBy, clamp, inRange, median, medianBy, percentile, range, rangeRight), kept separate so the number implementations stay unchanged. ([#1966])

• Added dedent, which removes common leading whitespace from template strings. ([#1679])

• Added deepFreeze for recursively freezing objects. ([#1680])

• Added mapValuesAsync and mapKeysAsync. ([#1544])

• Added toPascalCaseKeys, toKebabCaseKeys, and toConstantCaseKeys, completing the object key casing family. ([#1984])

• Exported the ToCamelCaseKeys, ToPascalCaseKeys, ToSnakeCaseKeys, ToKebabCaseKeys, and ToConstantCaseKeys types. ([#1651])

• Added a preserveArrays option to flattenObject. ([#974])

• Fixed retry to pass the last error to the delay callback ([#1759]) and to throw the last attempt's error without applying a final delay ([#1901]).

• Fixed mergeWith and toMerged to handle mixed array/object types consistently with merge. ([#2026])

• Fixed pullAt to remove the correct elements with negative indices. ([#1613])

• Fixed at, pullAt, orderBy, and sortBy to accept readonly arrays. ([#2016])

• Moved limitAsync from the array to the promise category. ([#2022])

• Included the NOTICE file in the published npm and JSR packages. ([#2020])

The following bring es-toolkit/compat closer to Lodash. Behavior for the affected edge cases now matches Lodash, so results may differ if you relied on the previous output.

• Added entries and entriesIn. ([#1874])

• Fixed compat/isMatch and compat/isMatchWith to handle object source patterns against primitive and non-plain-object targets like Lodash. ([#1432])

• Fixed compat/set to block constructor.prototype paths, preventing prototype pollution. ([#1904])

• Fixed compat/find to respect array-like length ([#1958]) and to convert fromIndex to an integer ([#1961]), and compat/indexOf to convert fromIndex to an integer when searching for NaN ([#1951]).

• Fixed compat/orderBy to resolve unresolved deep paths and nullish elements to undefined ([#2010]), to exclude the length property from array-like values ([#2002]), and to read the criterion property from primitive values ([#1903]).

• Fixed compat/toPath to split unquoted dotted keys inside brackets. ([#1899])

• Fixed compat/omit to treat a key array as a single deep path. ([#1902])

• Fixed compat/map to make the iteratee optional with an identity default. ([#1928])

• Fixed compat/size to count combined Unicode symbols as single characters. ([#1900])

• Fixed compat/intersectionBy to support number, object, and nullish iteratee shorthands ([#1993]), and compat/intersectionWith to apply the comparator when deduplicating the first array ([#1953]).

• Fixed compat/difference, compat/differenceBy, compat/uniqBy, and compat/unionBy to normalize -0 to 0. ([#2007])

• Fixed compat/maxBy and compat/minBy to skip nullish iteratee values ([#1927]), and compat/meanBy to skip undefined values when averaging ([#1978]).

• Fixed compat/some, compat/template ([#2009]), and compat/fill ([#1952]) to gate guard handling with isIterateeCall.

• Fixed compat/iteratee to treat a boolean as a property shorthand. ([#1941])

• Fixed compat/reverse to support array-like objects and arguments. ([#2008])

• Fixed compat/toArray to convert non-array-like iterables. ([#1999])

• Fixed compat/toString to render nested nullish values like Lodash. ([#1992])

• Fixed compat/zipObject to treat null keys and values as empty arrays. ([#2005])

• Fixed compat/sampleSize to clamp the default size to the collection length. ([#2003])

• Fixed compat/takeWhile, compat/takeRightWhile, and compat/uniqBy to support string inputs. ([#2004])

• Fixed compat/chunk to return an empty array for an empty collection with an Infinity size. ([#1995])

• Fixed compat/lastIndexOf to read holes in sparse arrays as undefined. ([#1977])

• Fixed compat/last to return undefined for empty array-like inputs. ([#1954])

• Fixed compat/pullAll to return the array as-is when values is nullish. ([#1962])

• Added a browser compatibility test suite. ([#2012])

• Improved documentation, JSDoc accuracy, tests, and internal refactoring across compat and the docs site. ([#1622], [#1789], [#1824], [#1844], [#1849], [#1854], [#1855], [#1859], [#1860], [#1868], [#1871], [#1887], [#1898], [#1933], [#1939], [#1947], [#1950], [#1955], [#1956], [#1957], [#1960], [#1963], [#1964], [#1968], [#1969], [#1970], [#1972], [#1979], [#1985], [#2000], [#2001], [#2021], [#2025], [#2027])

We sincerely thank @Antoliny0919, @D-Sketon, @kojesung, @chuenchen309, @mariazuheros, @DongEun02, @raon0211, @sukvvon, @racgoo, @dayongkr, @Kropiunig, @ssi02014, @sarathfrancis90, @mym0404, @mlnwns, @kdelay, @gwagjiug, @dohwi, @blro0319, @benedictleejh, @amir-rezaei, @ianzone, @sen2y, @rossyman, @eunwoo-levi, @ramong26, @Gdm0714, and everyone else who contributed. We appreciate your great efforts!