v1.53.0

Released on October 24th, 2026.

• Added serialize to es-toolkit/util, and hash in the new es-toolkit/util/hash entrypoint. ([#2067], [#2154])

• Added Queue to es-toolkit/util. ([#2150], [#2153])

• Added stringify to es-toolkit/query-string. ([#2121])

• Added sentenceCase. ([#2079])

• Added lerp and inverseLerp. ([#2078])

• Added the DistributiveOmit type. ([#2142])

• es-toolkit/compat now runs on Node.js 6 and ES2015 environments without transpilation or polyfills. ([#2097], [#2161])

• Fixed deepFreeze to freeze symbol and non-enumerable properties. ([#2143])

• Fixed Semaphore to keep release fast when many tasks are waiting. ([#2149])

• Fixed DeepPartial and DeepReadonly to preserve branded primitive types. ([#2074])

• Fixed the Merge type to keep the input type when merging a type with itself or a narrower type, and to use the source type when a defined source replaces a nullable or primitive value. ([#2148], [#2155])

• Fixed the fp intersectionBy to match each mapped value at most once in lazy pipes. ([#2146])

The following change results or types that v1.52.0 produced, so review them if you relied on the previous behavior.

• dedent now leaves interpolated values out of the indentation calculation ([#2099]), and throws a TypeError for a malformed template literal, like String.dedent ([#2100]).
• deburr now keeps letters of non-Latin scripts as they are. ([#2124])
• orderBy and sortBy now sort NaN in a consistent position. ([#2133])
• once now calls the function with the caller's this. ([#2069])
• findKey and mapKeys now type keys like Object.keys, so numeric keys are strings. ([#2077], [#2156])
• The fp head, last, maxBy, and minBy now always return T | undefined. ([#2113])

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.

• Fixed compat/add, compat/subtract, compat/multiply, and compat/divide to match Lodash on null operands. ([#2056])

• Fixed compat/ceil, compat/floor, and compat/round to coerce arguments like Lodash. ([#2064])

• Fixed compat/toString to read sparse array holes as undefined. ([#2091])

• Fixed compat/dropWhile, compat/dropRightWhile, and compat/some to normalize the predicate. ([#2072])

• Fixed compat/countBy to return a plain object. ([#2090])

• Fixed compat/pull, compat/pullAll, compat/pullAllBy, and compat/remove to handle nullish inputs. ([#2095])

• Fixed compat/xorBy and compat/xorWith to ignore the iteratee and comparator for a single array. ([#2098])

• Fixed compat/reduce and compat/reduceRight to resolve the iteratee like Lodash, and compat/forEach, compat/forEachRight, compat/forIn, compat/forInRight, compat/forOwn, and compat/forOwnRight to treat a non-function iteratee as identity. ([#2101], [#2158])

• Fixed compat/words to match titlecase letters, emoji sequences, and non-ASCII numerals and symbols, and to keep combining marks attached to their letter. ([#2102], [#2103], [#2110])

• Fixed compat/unionWith to pass comparator arguments in Lodash's order. ([#2114])

• Fixed compat/groupBy, compat/maxBy, and compat/minBy to call the iteratee with only the element. ([#2122])

• Fixed compat/deburr to only deburr Latin letters. ([#2123])

• Fixed compat/truncate to escape a string separator. ([#2130])

• Fixed compat/cloneDeep and compat/cloneDeepWith to keep errors uncloned, and compat/isMatch and compat/matches to compare errors like Lodash. ([#2159])

• Fixed compat/startCase to only uppercase the first letter of each word. ([#2160])

• Exported the PropertyPath type from es-toolkit/compat. ([#2145])

• Reduced the CommonJS bundle size of compat/every and compat/findLastIndex. ([#2162])

• Fixed documentation examples whose results did not match the code. ([#2071], [#2109], [#2132], [#2136], [#2138])

• Listed the iterator docs under the es-toolkit and fp tabs. ([#2137])

• Clarified which compat behavior fixes the contributing guide accepts. ([#2107], [#2108], [#2125])

We sincerely thank @arba-octo, @Archibald1948, @cyclomati, @D-Sketon, @dayongkr, @HyoYoonNam, @jaideeppyne, @jeonghoon11, @jeynes-log, @JonghwanWon, @mariazuheros, @MFA-G, @minseonkkim, @minsoo-web, @Patrick-SCH03, @poketopa, @raon0211, @ssi02014, @TalhaHunter101, and @Tnalxmsk for their contributions. We appreciate your great efforts!