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CHANGELOG.md

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[Unreleased]

  • Officially drop Node 16 support (it may still work)

[2.3.2] - 2024-05-27

  • Fix missing top-level exports for izipLongest3 and intersperse

[2.3.1] - 2024-04-05

  • Actually export the new itertool at the top level

[2.3.0] - 2024-04-05

  • Add new dupes(iterable, keyFn?) function, which returns groups of all duplicate items in iterable.

[2.2.5] - 2024-03-07

  • Add missing export for repeat

[2.2.4] - 2024-02-19

  • Type output types of all itertools more precisely

[2.2.3] - 2024-01-09

Fixes a bug where some iterators would render an inputted generator unusable, causing it to no longer be consumable after the iterable returns.

Example:

function* gen() {
  yield 1;
  yield 2;
  yield 3;
  yield 4;
}

const lazy = gen();

// [1, 2]
Array.from(islice(lazy, 0, 2));

Array.from(lazy);
// ❌ Previously:    []
// ✅ Now correctly: [3, 4]

This bug only happened when the source was a generator. It did not happen on a normal iterable.

Similar bugs were present in:

  • find()
  • islice()
  • takewhile()
  • dropwhile()

No other iterables were affected by this bug. This is the same bug that was fixed in 2.2.2 for reduce(), so many thanks again for surfacing this edge case, @quangloc99! 🙏

[2.2.2] - 2024-01-09

  • Fix reduce() bug where using it on a lazy generator would produce the wrong result (thanks for finding, @quangloc99 🙏!)

[2.2.1] - 2024-01-04

  • Fix islice() regression where it wasn't stopping on infinite iterables (thanks for finding, @Kareem-Medhat 🙏!)

[2.2.0]

  • Move to ESM by default
  • Drop support for node 12.x and 14.x
    (they probably still work, but they're EoL)

[2.1.2]

  • Improve tree-shakability when used in bundlers

[2.1.1]

  • Improve documentation
  • Fix a bug in reduce() in a very small edge case

[2.1.0]

The following functions retain richer type information about their arguments:

  • ifilter()
  • filter()
  • partition()

For example, TypeScript will now know the following:

const items = [3, "hi", -7, "foo", 13];

function isNum(value: unknown): value is number {
  return typeof value === "number";
}

const numbers: number[] = filter(items, isNum); // ✅

const [numbers, strings] = partition(items, isNum); // ✅
//     ^^^^^^^  ^^^^^^^ string[]
//     number[]

  • Add new find(iterable, pred) function, which is almost the same as first(iterable, pred) but behaves slightly more intuitive in the case where no predicate function is given.

  • Fix bug in chunked() with size=1

[2.0.0]

Breaking changes:

  • Rewritten source code in TypeScript (instead of Flow)
  • Modern ESM and CJS dual exports (fully tree-shakable when using ESM)
  • Massively reduced bundle size
  • Targeted ES2015 (instead of ES5)
  • Support only TypeScript versions >= 4.3
  • Drop Flow support*
  • Drop Node 10.x support
  • icompact, compact, and compactObject functions will now also remove null values, not only undefined

(*: I'm still open to bundling Flow types within this package, but only if that can be supported in a maintenance-free way, for example by using a script that will generate *.flow files from TypeScript source files. If someone can add support for that, I'm open to pull requests! 🙏 )

[1.7.1]

  • Add missing re-export of islice at the top level

[1.7.0]

  • TypeScript support!
  • Declare official support for Node 16.x
  • Drop support for Node 13.x (unstable release)

[1.6.1]

  • Include an error code with every FlowFixMe suppression (Flow 0.132.x compatibility)

[1.6.0]

  • New itertool: heads()

[1.5.4]

  • Export roundrobin() at the top level

[1.5.3]

  • Fix bug in chunked() when input is exactly dividable

[1.5.2]

  • Export count() function at the top level 🤦‍♂️

[1.5.1]

  • Internal change to make the code Flow 0.105.x compatible. Basically stops using array spreads ([...things]) in favor of Array.from().

[1.5.0]

  • Remove direct code dependency on regenerator-runtime (let @babel/runtime manage it)

[1.4.0]

  • Switch to Babel 7

[1.3.2]

  • Export filter at the top level

[1.3.1]

  • New build system
  • Cleaner NPM package contents

[1.3.0]

  • Drop support for Node 7

[1.2.2]

[1.2.1]

  • Export permutations() at the top-level

[1.2.0]

  • Add port of groupby() function (see #87, thanks @sgenoud!)

[1.1.6]

  • declare library to be side effect free (to help optimize webpack v4 builds)

[1.1.5]

  • Include regenerator runtime via babel-runtime

[1.1.4]

  • Make regenerator-runtime a normal runtime dependency

[1.1.3]

  • Lower required version of regenerator-runtime

[1.1.2]

  • Properly declare dependency on regenerator-runtime

[1.1.1]

  • Fix bug in cycle() with infinite inputs

[1.1.0]

Started keeping a CHANGELOG.