# it-merge

> Treat one or more iterables as a single iterable

Latest version **3.0.15** (published 2026-08-15) · Apache-2.0 OR MIT license · 0 weekly downloads

## Install

```sh
npm install it-merge
pnpm add it-merge
yarn add it-merge
bun add it-merge
```

## Health

**Score 75/100 (B)** — status: active.

Positive: has types; esm support; no vulnerabilities; has provenance; recently updated; high maintenance score; high quality score.

Warnings: low downloads.

## Facts

| | |
|---|---|
| Version | 3.0.15 |
| Published | 2026-08-15 |
| First published | 2021-01-20 |
| Weekly downloads | 0 |
| License | Apache-2.0 OR MIT |
| TypeScript types | bundled |
| Module format | ESM |
| Dependencies | 1 |
| Unpacked size | 35.9 KB |
| Known vulnerabilities | 0 |
| Install scripts | no |
| Provenance | attested (GitHub Actions) |
| GitHub stars | 283 |
| Author | Alex Potsides |
| Maintainers | achingbrain |

## Links

- npm: https://www.npmjs.com/package/it-merge
- Repository: https://github.com/achingbrain/it
- Homepage: https://github.com/achingbrain/it/tree/main/packages/it-merge#readme
- Issues: https://github.com/achingbrain/it/issues
- npm.io page: https://npm.io/package/it-merge

## Dependencies (1)

- [it-queueless-pushable](https://npm.io/package/it-queueless-pushable.md) ^2.0.0

## Recent versions

- 3.0.15 (latest) — 2026-08-15
- 3.0.14 — 2026-04-10
- 3.0.13 — 2026-04-10
- 3.0.12 — 2025-06-01
- 3.0.11 — 2025-05-13
- 3.0.10 — 2025-05-13
- 3.0.9 — 2025-03-19
- 3.0.8 — 2025-03-19
- 3.0.7 — 2025-03-06
- 3.0.6 — 2025-03-06
- 3.0.5 — 2024-04-25
- 3.0.4 — 2024-04-24
- 3.0.3 — 2023-11-15
- 3.0.2 — 2023-08-16
- 3.0.1 — 2023-05-09
- … 9 more at https://npm.io/package/it-merge/versions

## README

# it-merge

[![codecov](https://img.shields.io/codecov/c/github/achingbrain/it.svg?style=flat-square)](https://codecov.io/gh/achingbrain/it)
[![CI](https://img.shields.io/github/actions/workflow/status/achingbrain/it/js-test-and-release.yml?branch=main\&style=flat-square)](https://github.com/achingbrain/it/actions/workflows/js-test-and-release.yml?query=branch%3Amain)

> Treat one or more iterables as a single iterable

# About

<!--

!IMPORTANT!

Everything in this README between "# About" and "# Install" is automatically
generated and will be overwritten the next time the doc generator is run.

To make changes to this section, please update the @packageDocumentation section
of src/index.js or src/index.ts

To experiment with formatting, please run "npm run docs" from the root of this
repo and examine the changes made.

-->

Merge several (async)iterables into one, yield values as they arrive.

Nb. sources are iterated over in parallel so the order of emitted items is not guaranteed.

## Example

```javascript
import merge from 'it-merge'
import all from 'it-all'

// This can also be an iterator, generator, etc
const values1 = [0, 1, 2, 3, 4]
const values2 = [5, 6, 7, 8, 9]

const arr = all(merge(values1, values2))

console.info(arr) // 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
```

Async sources must be awaited:

```javascript
import merge from 'it-merge'
import all from 'it-all'

// This can also be an iterator, async iterator, generator, etc
const values1 = async function * () {
  yield * [0, 1, 2, 3, 4]
}
const values2 = async function * () {
  yield * [5, 6, 7, 8, 9]
}

const arr = await all(merge(values1(), values2()))

console.info(arr) // 0, 1, 5, 6, 2, 3, 4, 7, 8, 9  <- nb. order is not guaranteed
```

# Install

```console
$ npm i it-merge
```

## Browser `<script>` tag

Loading this module through a script tag will make its exports available as `ItMerge` in the global namespace.

```html
<script src="https://unpkg.com/it-merge/dist/index.min.js"></script>
```

# API Docs

- <https://achingbrain.github.io/it/modules/it-merge.html>

# License

Licensed under either of

- Apache 2.0, ([LICENSE-APACHE](https://github.com/achingbrain/it/blob/main/packages/it-merge/LICENSE-APACHE) / <http://www.apache.org/licenses/LICENSE-2.0>)
- MIT ([LICENSE-MIT](https://github.com/achingbrain/it/blob/main/packages/it-merge/LICENSE-MIT) / <http://opensource.org/licenses/MIT>)

# Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.

---
_Source: https://npm.io/package/it-merge · Machine-readable twin of the npm.io package page. Health data is recomputed on every publish._