iteragain

# Changelog All notable changes to this project will be documented in this file. The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/), adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html), and is generated by [Changie](https://github.com/miniscruff/changie). ## 4.2.1 - 2026-06-01 ### Changed - Improve `reverse` performance by collecting values with `push` and reversing in place instead of `unshift` - Improve `unzip` TypeScript types so each returned iterator is typed to its column rather than a union of all column types ### Fixed - Fix infinite loops when `cycle` receives an empty iterable, or when `chunks`/`windows` are given invalid zero lengths - Fix `tee` and `seekable` truncating or mishandling iterator values of `undefined` - Fix `unique({ justSeen: true })` not collapsing consecutive falsy duplicates such as `0`, `""`, and `false` - Fix `permutations(iterable)` one-argument form incorrectly returning a curried function instead of an iterator - Fix `shuffle` seeded swaps using out-of-bounds indices that could inject `undefined` into results - Fix `reduce` (without initial value), `min`, `max`, and `minmax` on empty iterators to throw instead of returning `undefined` - Align top-level `package.json` `types` entry with exports, fix README typo, and expand `format` script to cover `src/**/*.ts` - Fix seekable bounded cache eviction returning wrong values or undefined after maxLength is exceeded ## 4.2.0 - 2026-03-30 ### Added - Added concurrency limit param to promiseAll fn ## 4.1.6 - 2025-02-10 ### Fixed - `join` method no longer returns undefined with an empty input ## 4.1.5 - 2024-10-20 ### Fixed - A slight readme fix ## 4.1.4 - 2024-10-20 ### Fixed - Add missing return type in ExtendedIterator.shuffle's param type `seed` ## 4.1.3 - 2024-10-20 ### Fixed - Add missing return types to src/internal. Since jsr also requires those too ## 4.1.2 - 2024-10-20 ### Added - Added `empty` standalone function ### Fixed - Add missing return types in various files. Which is required for publishing to jsr ## 4.1.1 - 2024-10-20 ### Added - Updated readme, and now publishes to JSR as well ## 4.1.0 - 2024-07-10 ### Added - Added the `seed` optional param to `shuffle` - Added CHANGELOG.md file to Github release assets ## 4.0.2 - 2024-06-20 ### Fixed - Support for importing from node platform using `import` syntax ## 4.0.1 - 2024-04-12 ### Fixed - Fixed the default exports and they now point to the ESM build ## 4.0.0 - 2024-04-12 ### Changed - `package.json` now includes an `exports` property, which is a breaking change for older module resolutions ### Fixed - Added missing `default` export when importing with ".", i.e. root - Fixed imports using /internal and /\* - Fixed year in license file to be 2024 ### Added - Added this changelog file - Added ESM and CJS support in the one package ### Deprecated - The iteragain-es package is now deprecated. ## 3.18.4 - 2024-01-15 ### Changed - `partiton` now calls next instead of using `this`. ### Fixed - Fixed immutability bug in ExtendedIterator. - Update docs when package.json is updated. ## 3.18.3 - 2023-10-03 ### Fixed - Fixed filter typings. - Removed docs publish. - Updated badge in readme. ### Changed - Renamed to update docs ## 3.18.2 - 2023-09-22 ### Fixed - Publishing is now done with execSync. - Put code inside of main. - publish-all now uses sh instead of execSync which is blocking. - Added js-utils. - turn off incremental as it causes problems with cleaning. - Removed duplicate entry in .npmignore. ## 3.18.1 - 2023-09-22 ### Fixed - modified npmignore. ## 3.18.0 - 2023-09-22 ### Added - Added support for currying to most standalone functions - Added some jsdoc to pipe - Added check and check:watch scripts - Added toIterableIterator to index.ts - Added toIterableIterator - Added npm-publish workflow - Added some badges ### Fixed - Fixed tap type bug - Fixed pre-commit - Fixed max type bugs - Fixed a type bug with chunks.ts ### Changed - Improved type checking in tests by wrapping `equal` - Fixed flatMap type bug - `length` no longer imports `reduce` - More support for currying and changed all imports to types.ts to have the type keyword - `reverse` now uses toIterableIterator - Renamed AnyFunction to Fn and made it more useful - Updated delpoy-docs.yml