# @mnrendra/find-up

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A lightweight utility to find a file or directory by searching upward from a specific directory.

## Install
```bash
npm i @mnrendra/find-up
```

## API Reference

### `findUp`
Finds a file or directory by searching upward from a specific directory.<br/>
*If no initial directory is provided, it will start from the current working directory (`process.cwd()`).*

#### Type
```typescript
(target: string, initDir?: string) => string | null
```

#### Parameters
| Name      | Type     | Description                                                              |
|-----------|----------|--------------------------------------------------------------------------|
| `target`  | `string` | The name of the file or directory to find.                               |
| `initDir` | `string` | Optional directory to start searching from. Defaults to `process.cwd()`. |

#### Return
```typescript
string | null
```
The absolute path of the file or directory if found, or `null` if not found.

## Usage

### CommonJS
Let's say your package directory is `/foo/package-directory`, where the `package.json` file is located.<br/>
Then, you want to find the `package.json` from `/foo/package-directory/src/index.cjs`:
```javascript
const { findUp } = require('@mnrendra/find-up')

const pkgPath1 = findUp('package.json') // Searches from `process.cwd()`: '/foo/package-directory'.
const pkgPath2 = findUp('package.json', __dirname) // Searches from `__dirname`: '/foo/package-directory/src'.

console.log(pkgPath1 === pkgPath2) // Output: true
console.log(pkgPath1) // Output: /foo/package-directory/package.json
console.log(pkgPath2) // Output: /foo/package-directory/package.json
```

### ES Modules
Let's say your package directory is `/foo/package-directory`, where the `package.json` file is located.<br/>
Then, you want to find the `package.json` from `/foo/package-directory/src/index.mjs`:
```javascript
import { dirname } from 'node:path'
import { fileURLToPath } from 'node:url'

import { findUp } from '@mnrendra/find-up'

const __filename = fileURLToPath(import.meta.url)
const __dirname = dirname(__filename)

const pkgPath1 = findUp('package.json') // Searches from `process.cwd()`: '/foo/package-directory'.
const pkgPath2 = findUp('package.json', __dirname) // Searches from `__dirname`: '/foo/package-directory/src'.

console.log(pkgPath1 === pkgPath2) // Output: true
console.log(pkgPath1) // Output: /foo/package-directory/package.json
console.log(pkgPath2) // Output: /foo/package-directory/package.json
```

## License
[MIT](https://github.com/mnrendra/find-up/blob/HEAD/LICENSE)

## Author
[@mnrendra](https://github.com/mnrendra)