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# @npmcli/fs
polyfills, and extensions, of the core `fs` module.
## Features
- `fs.cp` polyfill for node < 16.7.0
- `fs.withTempDir` added
- `fs.readdirScoped` added
- `fs.moveFile` added
## `fs.withTempDir(root, fn, options) -> Promise`
### Parameters
- `root`: the directory in which to create the temporary directory
- `fn`: a function that will be called with the path to the temporary directory
- `options`
- `tmpPrefix`: a prefix to be used in the generated directory name
### Usage
The `withTempDir` function creates a temporary directory, runs the provided
function (`fn`), then removes the temporary directory and resolves or rejects
based on the result of `fn`.
```js
const fs = require('@npmcli/fs')
const os = require('os')
// this function will be called with the full path to the temporary directory
// it is called with `await` behind the scenes, so can be async if desired.
const myFunction = async (tempPath) => {
return 'done!'
}
const main = async () => {
const result = await fs.withTempDir(os.tmpdir(), myFunction)
// result === 'done!'
}
main()
```
## `fs.readdirScoped(root) -> Promise`
### Parameters
- `root`: the directory to read
### Usage
Like `fs.readdir` but handling `@org/module` dirs as if they were
a single entry.
```javascript
const { readdirScoped } = require('@npmcli/fs')
const entries = await readdirScoped('node_modules')
// entries will be something like: ['a', '@org/foo', '@org/bar']
```
## `fs.moveFile(source, dest, options) -> Promise`
A fork of [move-file](https://github.com/sindresorhus/move-file) with
support for Common JS.
### Highlights
- Promise API.
- Supports moving a file across partitions and devices.
- Optionally prevent overwriting an existing file.
- Creates non-existent destination directories for you.
- Automatically recurses when source is a directory.
### Parameters
- `source`: File, or directory, you want to move.
- `dest`: Where you want the file or directory moved.
- `options`
- `overwrite` (`boolean`, default: `true`): Overwrite existing destination file(s).
### Usage
The built-in
[`fs.rename()`](https://nodejs.org/api/fs.html#fs_fs_rename_oldpath_newpath_callback)
is just a JavaScript wrapper for the C `rename(2)` function, which doesn't
support moving files across partitions or devices. This module is what you
would have expected `fs.rename()` to be.
```js
const { moveFile } = require('@npmcli/fs');
(async () => {
await moveFile('source/unicorn.png', 'destination/unicorn.png');
console.log('The file has been moved');
})();
```
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