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+# @npmcli/fs
+
+polyfills, and extensions, of the core `fs` module.
+
+## Features
+
+- all exposed functions return promises
+- `fs.rm` polyfill for node versions < 14.14.0
+- `fs.mkdir` polyfill adding support for the `recursive` and `force` options in node versions < 10.12.0
+- `fs.copyFile` extended to accept an `owner` option
+- `fs.mkdir` extended to accept an `owner` option
+- `fs.mkdtemp` extended to accept an `owner` option
+- `fs.writeFile` extended to accept an `owner` option
+- `fs.withTempDir` added
+- `fs.cp` polyfill for node < 16.7.0
+
+## The `owner` option
+
+The `copyFile`, `mkdir`, `mkdtemp`, `writeFile`, and `withTempDir` functions
+all accept a new `owner` property in their options. It can be used in two ways:
+
+- `{ owner: { uid: 100, gid: 100 } }` - set the `uid` and `gid` explicitly
+- `{ owner: 100 }` - use one value, will set both `uid` and `gid` the same
+
+The special string `'inherit'` may be passed instead of a number, which will
+cause this module to automatically determine the correct `uid` and/or `gid`
+from the nearest existing parent directory of the target.
+
+## `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()
+```