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# Externality

Externality is a set of utilities for handling identifying whether a given package or path should be considered an external package that can be imported at runtime, or whether is should be bundled in a build step.

It also contains a webpack and rollup plugin for encapsulating this functionality.

## Install

Install using npm or yarn:

```bash
npm i externality
# or
yarn add externality
```

## Rollup plugin

```js
import { rollupExternals } from 'externality'
```

## Webpack plugin

```js
import { webpackExternals } from 'externality'
```

## Utils

### `resolveId`

This utility is powered by [`enhanced-resolve`](https://github.com/webpack/enhanced-resolve) and will resolve a given module/path with support for extensions, CJS/ESM and more.

```js
import { resolveId } from 'externality'

await resolveId('my-lib', { type: 'commonjs' })
// {
//   id: 'my-lib',
//   path: '/path/to/node_modules/my-lib/index.js',
//   type: 'commonjs'
// }
```

### `isExternal`

```js
import { isExternal } from 'externality'

await isExternal('my-lib', '.')
// {
//   id: 'my-lib',
//   external: true
// }
```

## License

[MIT](./LICENSE)

<!-- Badges -->
[npm-version-src]: https://img.shields.io/npm/v/externality?style=flat-square
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[npm-downloads-href]: https://npmjs.com/package/externality

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[codecov-href]: https://codecov.io/gh/unjs/externality

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[bundle-href]: https://bundlephobia.com/result?p=externality