216 lines
6.0 KiB
Markdown
216 lines
6.0 KiB
Markdown
# @nodelib/fs.walk
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> A library for efficiently walking a directory recursively.
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## :bulb: Highlights
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* :moneybag: Returns useful information: `name`, `path`, `dirent` and `stats` (optional).
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* :rocket: On Node.js 10.10+ uses the mechanism without additional calls to determine the entry type for performance reasons. See [`old` and `modern` mode](https://github.com/nodelib/nodelib/blob/master/packages/fs/fs.scandir/README.md#old-and-modern-mode).
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* :gear: Built-in directories/files and error filtering system.
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* :link: Can safely work with broken symbolic links.
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## Install
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```console
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npm install @nodelib/fs.walk
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```
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## Usage
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```ts
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import * as fsWalk from '@nodelib/fs.walk';
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fsWalk.walk('path', (error, entries) => { /* … */ });
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```
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## API
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### .walk(path, [optionsOrSettings], callback)
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Reads the directory recursively and asynchronously. Requires a callback function.
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> :book: If you want to use the Promise API, use `util.promisify`.
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```ts
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fsWalk.walk('path', (error, entries) => { /* … */ });
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fsWalk.walk('path', {}, (error, entries) => { /* … */ });
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fsWalk.walk('path', new fsWalk.Settings(), (error, entries) => { /* … */ });
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```
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### .walkStream(path, [optionsOrSettings])
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Reads the directory recursively and asynchronously. [Readable Stream](https://nodejs.org/dist/latest-v12.x/docs/api/stream.html#stream_readable_streams) is used as a provider.
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```ts
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const stream = fsWalk.walkStream('path');
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const stream = fsWalk.walkStream('path', {});
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const stream = fsWalk.walkStream('path', new fsWalk.Settings());
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```
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### .walkSync(path, [optionsOrSettings])
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Reads the directory recursively and synchronously. Returns an array of entries.
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```ts
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const entries = fsWalk.walkSync('path');
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const entries = fsWalk.walkSync('path', {});
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const entries = fsWalk.walkSync('path', new fsWalk.Settings());
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```
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#### path
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* Required: `true`
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* Type: `string | Buffer | URL`
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A path to a file. If a URL is provided, it must use the `file:` protocol.
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#### optionsOrSettings
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* Required: `false`
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* Type: `Options | Settings`
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* Default: An instance of `Settings` class
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An [`Options`](#options) object or an instance of [`Settings`](#settings) class.
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> :book: When you pass a plain object, an instance of the `Settings` class will be created automatically. If you plan to call the method frequently, use a pre-created instance of the `Settings` class.
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### Settings([options])
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A class of full settings of the package.
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```ts
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const settings = new fsWalk.Settings({ followSymbolicLinks: true });
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const entries = fsWalk.walkSync('path', settings);
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```
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## Entry
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* `name` — The name of the entry (`unknown.txt`).
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* `path` — The path of the entry relative to call directory (`root/unknown.txt`).
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* `dirent` — An instance of [`fs.Dirent`](./src/types/index.ts) class.
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* [`stats`] — An instance of `fs.Stats` class.
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## Options
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### basePath
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* Type: `string`
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* Default: `undefined`
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By default, all paths are built relative to the root path. You can use this option to set custom root path.
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In the example below we read the files from the `root` directory, but in the results the root path will be `custom`.
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```ts
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fsWalk.walkSync('root'); // → ['root/file.txt']
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fsWalk.walkSync('root', { basePath: 'custom' }); // → ['custom/file.txt']
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```
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### concurrency
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* Type: `number`
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* Default: `Infinity`
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The maximum number of concurrent calls to `fs.readdir`.
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> :book: The higher the number, the higher performance and the load on the File System. If you want to read in quiet mode, set the value to `4 * os.cpus().length` (4 is default size of [thread pool work scheduling](http://docs.libuv.org/en/v1.x/threadpool.html#thread-pool-work-scheduling)).
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### deepFilter
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* Type: [`DeepFilterFunction`](./src/settings.ts)
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* Default: `undefined`
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A function that indicates whether the directory will be read deep or not.
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```ts
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// Skip all directories that starts with `node_modules`
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const filter: DeepFilterFunction = (entry) => !entry.path.startsWith('node_modules');
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```
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### entryFilter
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* Type: [`EntryFilterFunction`](./src/settings.ts)
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* Default: `undefined`
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A function that indicates whether the entry will be included to results or not.
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```ts
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// Exclude all `.js` files from results
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const filter: EntryFilterFunction = (entry) => !entry.name.endsWith('.js');
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```
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### errorFilter
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* Type: [`ErrorFilterFunction`](./src/settings.ts)
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* Default: `undefined`
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A function that allows you to skip errors that occur when reading directories.
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For example, you can skip `ENOENT` errors if required:
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```ts
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// Skip all ENOENT errors
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const filter: ErrorFilterFunction = (error) => error.code == 'ENOENT';
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```
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### stats
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* Type: `boolean`
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* Default: `false`
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Adds an instance of `fs.Stats` class to the [`Entry`](#entry).
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> :book: Always use `fs.readdir` with additional `fs.lstat/fs.stat` calls to determine the entry type.
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### followSymbolicLinks
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* Type: `boolean`
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* Default: `false`
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Follow symbolic links or not. Call `fs.stat` on symbolic link if `true`.
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### `throwErrorOnBrokenSymbolicLink`
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* Type: `boolean`
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* Default: `true`
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Throw an error when symbolic link is broken if `true` or safely return `lstat` call if `false`.
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### `pathSegmentSeparator`
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* Type: `string`
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* Default: `path.sep`
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By default, this package uses the correct path separator for your OS (`\` on Windows, `/` on Unix-like systems). But you can set this option to any separator character(s) that you want to use instead.
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### `fs`
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* Type: `FileSystemAdapter`
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* Default: A default FS methods
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By default, the built-in Node.js module (`fs`) is used to work with the file system. You can replace any method with your own.
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```ts
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interface FileSystemAdapter {
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lstat: typeof fs.lstat;
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stat: typeof fs.stat;
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lstatSync: typeof fs.lstatSync;
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statSync: typeof fs.statSync;
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readdir: typeof fs.readdir;
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readdirSync: typeof fs.readdirSync;
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}
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const settings = new fsWalk.Settings({
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fs: { lstat: fakeLstat }
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});
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```
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## Changelog
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See the [Releases section of our GitHub project](https://github.com/nodelib/nodelib/releases) for changelog for each release version.
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## License
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This software is released under the terms of the MIT license.
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