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