# @techor/extend

> Deeply extend objects

Latest version **3.2.5** (published 2025-05-13) · MIT license · 0 weekly downloads

## Install

```sh
npm install @techor/extend
pnpm add @techor/extend
yarn add @techor/extend
bun add @techor/extend
```

## Health

**Score 55/100 (C)** — status: stable.

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

Warnings: low downloads.

Negative: stale.

## Facts

| | |
|---|---|
| Version | 3.2.5 |
| Published | 2025-05-13 |
| First published | 2023-03-31 |
| Weekly downloads | 0 |
| License | MIT |
| TypeScript types | bundled |
| Module format | ESM + CommonJS |
| Dependencies | 0 |
| Unpacked size | 11 KB |
| Known vulnerabilities | 0 |
| Install scripts | no |
| Provenance | attested (GitHub Actions) |
| GitHub stars | 11 |
| Author | Aron |
| Maintainers | 1aron |
| Keywords | extend, merge, deeply, utils |

## Links

- npm: https://www.npmjs.com/package/@techor/extend
- Repository: https://github.com/techor-dev/techor
- Homepage: https://aron.tw
- Issues: https://github.com/techor-dev/techor/issues
- npm.io page: https://npm.io/package/@techor/extend

## Recent versions

- 3.2.5 (latest) — 2025-05-13
- 3.2.4 — 2025-05-13
- 3.2.3 — 2025-05-08
- 3.2.2 — 2025-05-08
- 3.2.1 — 2025-05-08
- 3.2.0 — 2025-03-20
- 3.1.7 — 2024-12-19
- 3.1.6 — 2024-12-16
- 3.1.5 — 2024-12-10
- 3.1.4 — 2024-11-27
- 3.1.3 — 2024-11-27
- 3.1.2 — 2024-11-26
- 3.1.1 — 2024-11-26
- 3.1.0 — 2024-11-25
- 3.0.23 — 2024-05-08
- … 104 more at https://npm.io/package/@techor/extend/versions

## README

<br>
<div align="center">

<p align="center">Deeply extend objects ~400B</p>

<p align="center">
    <a aria-label="overview" href="https://github.com/techor-dev/techor">
        <picture>
            <source media="(prefers-color-scheme: dark)" srcset="https://img.shields.io/badge/%E2%AC%85%20back-%20?color=212022&style=for-the-badge">
            <source media="(prefers-color-scheme: light)" srcset="https://img.shields.io/badge/%E2%AC%85%20back-%20?color=f6f7f8&style=for-the-badge">
            <img alt="NPM Version" src="https://img.shields.io/badge/%E2%AC%85%20back-%20?color=f6f7f8&style=for-the-badge">
        </picture>
    </a>
    <a aria-label="GitHub release (latest by date including pre-releases)" href="https://github.com/techor-dev/techor/releases">
        <picture>
            <source media="(prefers-color-scheme: dark)" srcset="https://img.shields.io/github/v/release/techor-dev/techor?include_prereleases&color=212022&label=&style=for-the-badge&logo=github&logoColor=fff">
            <source media="(prefers-color-scheme: light)" srcset="https://img.shields.io/github/v/release/techor-dev/techor?include_prereleases&color=f6f7f8&label=&style=for-the-badge&logo=github&logoColor=%23000">
            <img alt="NPM Version" src="https://img.shields.io/github/v/release/techor-dev/techor?include_prereleases&color=f6f7f8&label=&style=for-the-badge&logo=github">
        </picture>
    </a>
    <a aria-label="NPM Package" href="https://www.npmjs.com/package/@techor/extend">
        <picture>
            <source media="(prefers-color-scheme: dark)" srcset="https://img.shields.io/npm/dm/@techor/extend?color=212022&label=%20&logo=npm&style=for-the-badge">
            <source media="(prefers-color-scheme: light)" srcset="https://img.shields.io/npm/dm/@techor/extend?color=f6f7f8&label=%20&logo=npm&style=for-the-badge">
            <img alt="NPM package ( download / month )" src="https://img.shields.io/npm/dm/@techor/extend?color=f6f7f8&label=%20&logo=npm&style=for-the-badge">
        </picture>
    </a>
    <a aria-label="Follow @aron1tw" href="https://twitter.com/aron1tw">
        <picture>
            <source media="(prefers-color-scheme: dark)" srcset="https://img.shields.io/static/v1?label=%20&message=twitter&color=212022&logo=twitter&style=for-the-badge">
            <source media="(prefers-color-scheme: light)" srcset="https://img.shields.io/static/v1?label=%20&message=twitter&color=f6f7f8&logo=twitter&style=for-the-badge">
            <img alt="Follow @mastercorg" src="https://img.shields.io/static/v1?label=%20&message=twitter&color=f6f7f8&logo=twitter&style=for-the-badge">
        </picture>
    </a>
    <a aria-label="Github Actions" href="https://github.com/techor-dev/techor/actions/workflows/release.yml">
        <picture>
            <source media="(prefers-color-scheme: dark)" srcset="https://img.shields.io/github/actions/workflow/status/techor-dev/techor/release.yml?branch=main&label=%20&message=twitter&color=212022&logo=githubactions&style=for-the-badge">
            <source media="(prefers-color-scheme: light)" srcset="https://img.shields.io/github/actions/workflow/status/techor-dev/techor/release.yml?branch=main&label=%20&message=twitter&color=f6f7f8&logo=githubactions&style=for-the-badge&logoColor=%23000">
            <img alt="Github release actions" src="https://img.shields.io/github/actions/workflow/status/techor-dev/techor/release.yml?branch=main&label=%20&message=twitter&color=f6f7f8&logo=githubactions&style=for-the-badge&logoColor=%23000">
        </picture>
    </a>
</p>

</div>

<br>

- Untainted input sources
- Deeply extend
- Return the extended result
- Common extensions for configuration and options

<br>

## Getting Started

```bash
npm install @techor/extend
```

## Usage
```js
import extend from '@techor/extend'

extend({ a: 1, b:2 }, { b: null, c:3 })
// { a:1, b: null, c:3 }
```

## Overview
```js
expect(
    extend(
        {
            a: 1,
            b: 2,
            d: {
                a: 1,
                b: [],
                c: { test1: 123, test2: 321 }
            },
            f: 5,
            g: 123,
            i: 321,
            j: [1, 2]
        },
        {
            b: 3,
            c: 5,
            d: {
                b: { first: 'one', second: 'two' },
                c: { test2: 222 }
            },
            e: { one: 1, two: 2 },
            f: [],
            g: (void 0),
            h: /abc/g,
            i: null,
            j: [3, 4]
        }
    )
)
    .toEqual({
        a: 1,
        b: 3,
        d:
        {
            a: 1,
            b: { first: 'one', second: 'two' },
            c: { test1: 123, test2: 222 }
        },
        f: [],
        g: undefined,
        c: 5,
        e: { one: 1, two: 2 },
        h: /abc/g,
        i: null,
        j: [3, 4]
    })
```

## Inspiration

- [deep-extend](https://www.npmjs.com/package/deep-extend) — Recursive extend module

<br>

<a aria-label="overview" href="https://github.com/techor-dev/techor#utilities">
<picture>
    <source media="(prefers-color-scheme: dark)" srcset="https://img.shields.io/badge/%E2%AC%85%20back%20to%20contents-%20?color=212022&style=for-the-badge">
    <source media="(prefers-color-scheme: light)" srcset="https://img.shields.io/badge/%E2%AC%85%20back%20to%20contents-%20?color=f6f7f8&style=for-the-badge">
    <img alt="NPM Version" src="https://img.shields.io/badge/%E2%AC%85%20back%20to%20contents-%20?color=f6f7f8&style=for-the-badge">
</picture>
</a>

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