# readdirp [](https://github.com/paulmillr/readdirp)
Recursive version of [fs.readdir](https://nodejs.org/api/fs.html#fs_fs_readdir_path_options_callback). Exposes a **stream API** and a **promise API**.
```sh
npm install readdirp
```
```javascript
const readdirp = require('readdirp');
// Use streams to achieve small RAM & CPU footprint.
// 1) Streams example with for-await.
for await (const entry of readdirp('.')) {
const {path} = entry;
console.log(`${JSON.stringify({path})}`);
}
// 2) Streams example, non for-await.
// Print out all JS files along with their size within the current folder & subfolders.
readdirp('.', {fileFilter: '*.js', alwaysStat: true})
.on('data', (entry) => {
const {path, stats: {size}} = entry;
console.log(`${JSON.stringify({path, size})}`);
})
// Optionally call stream.destroy() in `warn()` in order to abort and cause 'close' to be emitted
.on('warn', error => console.error('non-fatal error', error))
.on('error', error => console.error('fatal error', error))
.on('end', () => console.log('done'));
// 3) Promise example. More RAM and CPU than streams / for-await.
const files = await readdirp.promise('.');
console.log(files.map(file => file.path));
// Other options.
readdirp('test', {
fileFilter: '*.js',
directoryFilter: ['!.git', '!*modules']
// directoryFilter: (di) => di.basename.length === 9
type: 'files_directories',
depth: 1
});
```
For more examples, check out `examples` directory.
## API
`const stream = readdirp(root[, options])` — **Stream API**
- Reads given root recursively and returns a `stream` of [entry infos](#entryinfo)
- Optionally can be used like `for await (const entry of stream)` with node.js 10+ (`asyncIterator`).
- `on('data', (entry) => {})` [entry info](#entryinfo) for every file / dir.
- `on('warn', (error) => {})` non-fatal `Error` that prevents a file / dir from being processed. Example: inaccessible to the user.
- `on('error', (error) => {})` fatal `Error` which also ends the stream. Example: illegal options where passed.
- `on('end')` — we are done. Called when all entries were found and no more will be emitted.
- `on('close')` — stream is destroyed via `stream.destroy()`.
Could be useful if you want to manually abort even on a non fatal error.
At that point the stream is no longer `readable` and no more entries, warning or errors are emitted
- To learn more about streams, consult the very detailed [nodejs streams documentation](https://nodejs.org/api/stream.html)
or the [stream-handbook](https://github.com/substack/stream-handbook)
`const entries = await readdirp.promise(root[, options])` — **Promise API**. Returns a list of [entry infos](#entryinfo).
First argument is awalys `root`, path in which to start reading and recursing into subdirectories.
### options
- `fileFilter: ["*.js"]`: filter to include or exclude files. A `Function`, Glob string or Array of glob strings.
- **Function**: a function that takes an entry info as a parameter and returns true to include or false to exclude the entry
- **Glob string**: a string (e.g., `*.js`) which is matched using [picomatch](https://github.com/micromatch/picomatch), so go there for more
information. Globstars (`**`) are not supported since specifying a recursive pattern for an already recursive function doesn't make sense. Negated globs (as explained in the minimatch documentation) are allowed, e.g., `!*.txt` matches everything but text files.
- **Array of glob strings**: either need to be all inclusive or all exclusive (negated) patterns otherwise an error is thrown.
`['*.json', '*.js']` includes all JavaScript and Json files.
`['!.git', '!node_modules']` includes all directories except the '.git' and 'node_modules'.
- Directories that do not pass a filter will not be recursed into.
- `directoryFilter: ['!.git']`: filter to include/exclude directories found and to recurse into. Directories that do not pass a filter will not be recursed into.
- `depth: 5`: depth at which to stop recursing even if more subdirectories are found
- `type: 'files'`: determines if data events on the stream should be emitted for `'files'` (default), `'directories'`, `'files_directories'`, or `'all'`. Setting to `'all'` will also include entries for other types of file descriptors like character devices, unix sockets and named pipes.
- `alwaysStat: false`: always return `stats` property for every file. Default is `false`, readdirp will return `Dirent` entries. Setting it to `true` can double readdir execution time - use it only when you need file `size`, `mtime` etc. Cannot be enabled on node <10.10.0.
- `lstat: false`: include symlink entries in the stream along with files. When `true`, `fs.lstat` would be used instead of `fs.stat`
### `EntryInfo`
Has the following properties:
- `path: 'assets/javascripts/react.js'`: path to the file/directory (relative to given root)
- `fullPath: '/Users/dev/projects/app/assets/javascripts/react.js'`: full path to the file/directory found
- `basename: 'react.js'`: name of the file/directory
- `dirent: fs.Dirent`: built-in [dir entry object](https://nodejs.org/api/fs.html#fs_class_fs_dirent) - only with `alwaysStat: false`
- `stats: fs.Stats`: built in [stat object](https://nodejs.org/api/fs.html#fs_class_fs_stats) - only with `alwaysStat: true`
## Changelog
- 3.5 (Oct 13, 2020) disallows recursive directory-based symlinks.
Before, it could have entered infinite loop.
- 3.4 (Mar 19, 2020) adds support for directory-based symlinks.
- 3.3 (Dec 6, 2019) stabilizes RAM consumption and enables perf management with `highWaterMark` option. Fixes race conditions related to `for-await` looping.
- 3.2 (Oct 14, 2019) improves performance by 250% and makes streams implementation more idiomatic.
- 3.1 (Jul 7, 2019) brings `bigint` support to `stat` output on Windows. This is backwards-incompatible for some cases. Be careful. It you use it incorrectly, you'll see "TypeError: Cannot mix BigInt and other types, use explicit conversions".
- 3.0 brings huge performance improvements and stream backpressure support.
- Upgrading 2.x to 3.x:
- Signature changed from `readdirp(options)` to `readdirp(root, options)`
- Replaced callback API with promise API.
- Renamed `entryType` option to `type`
- Renamed `entryType: 'both'` to `'files_directories'`
- `EntryInfo`
- Renamed `stat` to `stats`
- Emitted only when `alwaysStat: true`
- `dirent` is emitted instead of `stats` by default with `alwaysStat: false`
- Renamed `name` to `basename`
- Removed `parentDir` and `fullParentDir` properties
- Supported node.js versions:
- 3.x: node 8+
- 2.x: node 0.6+
## License
Copyright (c) 2012-2019 Thorsten Lorenz, Paul Miller (<https://paulmillr.com>)
MIT License, see [LICENSE](LICENSE) file.
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