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readdirp

Recursive version of fs.readdir. Exposes a stream API and a promise API.

npm install readdirp

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
Optionally can be used like for await (const entry of stream) with node.js 10+ (asyncIterator).
on('data', (entry) => {}) entry info 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 or the stream-handbook

const entries = await readdirp.promise(root[, options]) — Promise API. Returns a list of entry infos.

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, 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 - only with alwaysStat: false
stats: fs.Stats: built in stat object - 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

MIT License, see LICENSE file.

README.md

readdirp

API

options

EntryInfo

Changelog

License

`EntryInfo`