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Editing: README.md

# fast-glob

> It's a very fast and efficient [glob][glob_definition] library for [Node.js][node_js].

This package provides methods for traversing the file system and returning pathnames that matched a defined set of a specified pattern according to the rules used by the Unix Bash shell with some simplifications, meanwhile results are returned in **arbitrary order**. Quick, simple, effective.

## Table of Contents

<details>
<summary><strong>Details</strong></summary>

* [Highlights](#highlights)
* [Donation](#donation)
* [Old and modern mode](#old-and-modern-mode)
* [Pattern syntax](#pattern-syntax)
  * [Basic syntax](#basic-syntax)
  * [Advanced syntax](#advanced-syntax)
* [Installation](#installation)
* [API](#api)
  * [Asynchronous](#asynchronous)
  * [Synchronous](#synchronous)
  * [Stream](#stream)
    * [patterns](#patterns)
    * [[options]](#options)
  * [Helpers](#helpers)
    * [generateTasks](#generatetaskspatterns-options)
    * [isDynamicPattern](#isdynamicpatternpattern-options)
    * [escapePath](#escapepathpattern)
* [Options](#options-3)
  * [Common](#common)
    * [concurrency](#concurrency)
    * [cwd](#cwd)
    * [deep](#deep)
    * [followSymbolicLinks](#followsymboliclinks)
    * [fs](#fs)
    * [ignore](#ignore)
    * [suppressErrors](#suppresserrors)
    * [throwErrorOnBrokenSymbolicLink](#throwerroronbrokensymboliclink)
  * [Output control](#output-control)
    * [absolute](#absolute)
    * [markDirectories](#markdirectories)
    * [objectMode](#objectmode)
    * [onlyDirectories](#onlydirectories)
    * [onlyFiles](#onlyfiles)
    * [stats](#stats)
    * [unique](#unique)
  * [Matching control](#matching-control)
    * [braceExpansion](#braceexpansion)
    * [caseSensitiveMatch](#casesensitivematch)
    * [dot](#dot)
    * [extglob](#extglob)
    * [globstar](#globstar)
    * [baseNameMatch](#basenamematch)
* [FAQ](#faq)
  * [What is a static or dynamic pattern?](#what-is-a-static-or-dynamic-pattern)
  * [How to write patterns on Windows?](#how-to-write-patterns-on-windows)
  * [Why are parentheses match wrong?](#why-are-parentheses-match-wrong)
  * [How to exclude directory from reading?](#how-to-exclude-directory-from-reading)
  * [How to use UNC path?](#how-to-use-unc-path)
  * [Compatible with `node-glob`?](#compatible-with-node-glob)
* [Benchmarks](#benchmarks)
  * [Server](#server)
  * [Nettop](#nettop)
* [Changelog](#changelog)
* [License](#license)

</details>

## Highlights

* Fast. Probably the fastest.
* Supports multiple and negative patterns.
* Synchronous, Promise and Stream API.
* Object mode. Can return more than just strings.
* Error-tolerant.

## Donation

Do you like this project? Support it by donating, creating an issue or pull request.

[![Donate](https://img.shields.io/badge/Donate-PayPal-green.svg)][paypal_mrmlnc]

## Old and modern mode

This package works in two modes, depending on the environment in which it is used.

* **Old mode**. Node.js below 10.10 or when the [`stats`](#stats) option is *enabled*.
* **Modern mode**. Node.js 10.10+ and the [`stats`](#stats) option is *disabled*.

The modern mode is faster. Learn more about the [internal mechanism][nodelib_fs_scandir_old_and_modern_modern].

## Pattern syntax

> :warning: Always use forward-slashes in glob expressions (patterns and [`ignore`](#ignore) option). Use backslashes for escaping characters.

There is more than one form of syntax: basic and advanced. Below is a brief overview of the supported features. Also pay attention to our [FAQ](#faq).

> :book: This package uses a [`micromatch`][micromatch] as a library for pattern matching.

### Basic syntax

* An asterisk (`*`) — matches everything except slashes (path separators), hidden files (names starting with `.`).
* A double star or globstar (`**`) — matches zero or more directories.
* Question mark (`?`) – matches any single character except slashes (path separators).
* Sequence (`[seq]`) — matches any character in sequence.

> :book: A few additional words about the [basic matching behavior][picomatch_matching_behavior].

Some examples:

* `src/**/*.js` — matches all files in the `src` directory (any level of nesting) that have the `.js` extension.
* `src/*.??` — matches all files in the `src` directory (only first level of nesting) that have a two-character extension.
* `file-[01].js` — matches files: `file-0.js`, `file-1.js`.

### Advanced syntax

* [Escapes characters][micromatch_backslashes] (`\\`) — matching special characters (`$^*+?()[]`) as literals.
* [POSIX character classes][picomatch_posix_brackets] (`[[:digit:]]`).
* [Extended globs][micromatch_extglobs] (`?(pattern-list)`).
* [Bash style brace expansions][micromatch_braces] (`{}`).
* [Regexp character classes][micromatch_regex_character_classes] (`[1-5]`).
* [Regex groups][regular_expressions_brackets] (`(a|b)`).

> :book: A few additional words about the [advanced matching behavior][micromatch_extended_globbing].

Some examples:

* `src/**/*.{css,scss}` — matches all files in the `src` directory (any level of nesting) that have the `.css` or `.scss` extension.
* `file-[[:digit:]].js` — matches files: `file-0.js`, `file-1.js`, …, `file-9.js`.
* `file-{1..3}.js` — matches files: `file-1.js`, `file-2.js`, `file-3.js`.
* `file-(1|2)` — matches files: `file-1.js`, `file-2.js`.

## Installation

```console
npm install fast-glob
```

## API

### Asynchronous

```js
fg(patterns, [options])
```

Returns a `Promise` with an array of matching entries.

```js
const fg = require('fast-glob');

const entries = await fg(['.editorconfig', '**/index.js'], { dot: true });

// ['.editorconfig', 'services/index.js']
```

### Synchronous

```js
fg.sync(patterns, [options])
```

Returns an array of matching entries.

```js
const fg = require('fast-glob');

const entries = fg.sync(['.editorconfig', '**/index.js'], { dot: true });

// ['.editorconfig', 'services/index.js']
```

### Stream

```js
fg.stream(patterns, [options])
```

Returns a [`ReadableStream`][node_js_stream_readable_streams] when the `data` event will be emitted with matching entry.

```js
const fg = require('fast-glob');

const stream = fg.stream(['.editorconfig', '**/index.js'], { dot: true });

for await (const entry of stream) {
	// .editorconfig
	// services/index.js
}
```

#### patterns

* Required: `true`
* Type: `string | string[]`

Any correct pattern(s).

> :1234: [Pattern syntax](#pattern-syntax)
>
> :warning: This package does not respect the order of patterns. First, all the negative patterns are applied, and only then the positive patterns. If you want to get a certain order of records, use sorting or split calls.

#### [options]

* Required: `false`
* Type: [`Options`](#options-3)

See [Options](#options-3) section.

### Helpers

#### `generateTasks(patterns, [options])`

Returns the internal representation of patterns ([`Task`](./src/managers/tasks.ts) is a combining patterns by base directory).

```js
fg.generateTasks('*');

[{
    base: '.', // Parent directory for all patterns inside this task
    dynamic: true, // Dynamic or static patterns are in this task
    patterns: ['*'],
    positive: ['*'],
    negative: []
}]
```

##### patterns

* Required: `true`
* Type: `string | string[]`

Any correct pattern(s).

##### [options]

* Required: `false`
* Type: [`Options`](#options-3)

See [Options](#options-3) section.

#### `isDynamicPattern(pattern, [options])`

Returns `true` if the passed pattern is a dynamic pattern.

> :1234: [What is a static or dynamic pattern?](#what-is-a-static-or-dynamic-pattern)

```js
fg.isDynamicPattern('*'); // true
fg.isDynamicPattern('abc'); // false
```

##### pattern

* Required: `true`
* Type: `string`

Any correct pattern.

##### [options]

* Required: `false`
* Type: [`Options`](#options-3)

See [Options](#options-3) section.

#### `escapePath(pattern)`

Returns a path with escaped special characters (`*?|(){}[]`, `!` at the beginning of line, `@+!` before the opening parenthesis).

```js
fg.escapePath('!abc'); // \\!abc
fg.escapePath('C:/Program Files (x86)'); // C:/Program Files \$x86\$
```

##### pattern

* Required: `true`
* Type: `string`

Any string, for example, a path to a file.

## Options

### Common options

#### concurrency

* Type: `number`
* Default: `os.cpus().length`

Specifies the maximum number of concurrent requests from a reader to read directories.

> :book: The higher the number, the higher the performance and load on the file system. If you want to read in quiet mode, set the value to a comfortable number or `1`.

#### cwd

* Type: `string`
* Default: `process.cwd()`

The current working directory in which to search.

#### deep

* Type: `number`
* Default: `Infinity`

Specifies the maximum depth of a read directory relative to the start directory.

For example, you have the following tree:

```js
dir/
└── one/            // 1
    └── two/        // 2
        └── file.js // 3
```

```js
// With base directory
fg.sync('dir/**', { onlyFiles: false, deep: 1 }); // ['dir/one']
fg.sync('dir/**', { onlyFiles: false, deep: 2 }); // ['dir/one', 'dir/one/two']

// With cwd option
fg.sync('**', { onlyFiles: false, cwd: 'dir', deep: 1 }); // ['one']
fg.sync('**', { onlyFiles: false, cwd: 'dir', deep: 2 }); // ['one', 'one/two']
```

> :book: If you specify a pattern with some base directory, this directory will not participate in the calculation of the depth of the found directories. Think of it as a [`cwd`](#cwd) option.

#### followSymbolicLinks

* Type: `boolean`
* Default: `true`

Indicates whether to traverse descendants of symbolic link directories when expanding `**` patterns.

> :book: Note that this option does not affect the base directory of the pattern. For example, if `./a` is a symlink to directory `./b` and you specified `['./a**', './b/**']` patterns, then directory `./a` will still be read.

> :book: If the [`stats`](#stats) option is specified, the information about the symbolic link (`fs.lstat`) will be replaced with information about the entry (`fs.stat`) behind it.

#### fs

* Type: `FileSystemAdapter`
* Default: `fs.*`

Custom implementation of methods for working with the file system.

```ts
export interface FileSystemAdapter {
    lstat?: typeof fs.lstat;
    stat?: typeof fs.stat;
    lstatSync?: typeof fs.lstatSync;
    statSync?: typeof fs.statSync;
    readdir?: typeof fs.readdir;
    readdirSync?: typeof fs.readdirSync;
}
```

#### ignore

* Type: `string[]`
* Default: `[]`

An array of glob patterns to exclude matches. This is an alternative way to use negative patterns.

```js
dir/
├── package-lock.json
└── package.json
```

```js
fg.sync(['*.json', '!package-lock.json']);            // ['package.json']
fg.sync('*.json', { ignore: ['package-lock.json'] }); // ['package.json']
```

#### suppressErrors

* Type: `boolean`
* Default: `false`

By default this package suppress only `ENOENT` errors. Set to `true` to suppress any error.

> :book: Can be useful when the directory has entries with a special level of access.

#### throwErrorOnBrokenSymbolicLink

* Type: `boolean`
* Default: `false`

Throw an error when symbolic link is broken if `true` or safely return `lstat` call if `false`.

> :book: This option has no effect on errors when reading the symbolic link directory.

### Output control

#### absolute

* Type: `boolean`
* Default: `false`

Return the absolute path for entries.

```js
fg.sync('*.js', { absolute: false }); // ['index.js']
fg.sync('*.js', { absolute: true });  // ['/home/user/index.js']
```

> :book: This option is required if you want to use negative patterns with absolute path, for example, `!${__dirname}/*.js`.

#### markDirectories

* Type: `boolean`
* Default: `false`

Mark the directory path with the final slash.

```js
fg.sync('*', { onlyFiles: false, markDirectories: false }); // ['index.js', 'controllers']
fg.sync('*', { onlyFiles: false, markDirectories: true });  // ['index.js', 'controllers/']
```

#### objectMode

* Type: `boolean`
* Default: `false`

Returns objects (instead of strings) describing entries.

```js
fg.sync('*', { objectMode: false }); // ['src/index.js']
fg.sync('*', { objectMode: true });  // [{ name: 'index.js', path: 'src/index.js', dirent: <fs.Dirent> }]
```

The object has the following fields:

* name (`string`) — the last part of the path (basename)
* path (`string`) — full path relative to the pattern base directory
* dirent ([`fs.Dirent`][node_js_fs_class_fs_dirent]) — instance of `fs.Dirent`

> :book: An object is an internal representation of entry, so getting it does not affect performance.

#### onlyDirectories

* Type: `boolean`
* Default: `false`

Return only directories.

```js
fg.sync('*', { onlyDirectories: false }); // ['index.js', 'src']
fg.sync('*', { onlyDirectories: true });  // ['src']
```

> :book: If `true`, the [`onlyFiles`](#onlyfiles) option is automatically `false`.

#### onlyFiles

* Type: `boolean`
* Default: `true`

Return only files.

```js
fg.sync('*', { onlyFiles: false }); // ['index.js', 'src']
fg.sync('*', { onlyFiles: true });  // ['index.js']
```

#### stats

* Type: `boolean`
* Default: `false`

Enables an [object mode](#objectmode) with an additional field:

* stats ([`fs.Stats`][node_js_fs_class_fs_stats]) — instance of `fs.Stats`

```js
fg.sync('*', { stats: false }); // ['src/index.js']
fg.sync('*', { stats: true });  // [{ name: 'index.js', path: 'src/index.js', dirent: <fs.Dirent>, stats: <fs.Stats> }]
```

> :book: Returns `fs.stat` instead of `fs.lstat` for symbolic links when the [`followSymbolicLinks`](#followsymboliclinks) option is specified.
>
> :warning: Unlike [object mode](#objectmode) this mode requires additional calls to the file system. On average, this mode is slower at least twice. See [old and modern mode](#old-and-modern-mode) for more details.

#### unique

* Type: `boolean`
* Default: `true`

Ensures that the returned entries are unique.

```js
fg.sync(['*.json', 'package.json'], { unique: false }); // ['package.json', 'package.json']
fg.sync(['*.json', 'package.json'], { unique: true });  // ['package.json']
```

If `true` and similar entries are found, the result is the first found.

### Matching control

#### braceExpansion

* Type: `boolean`
* Default: `true`

Enables Bash-like brace expansion.

> :1234: [Syntax description][bash_hackers_syntax_expansion_brace] or more [detailed description][micromatch_braces].

```js
dir/
├── abd
├── acd
└── a{b,c}d
```

```js
fg.sync('a{b,c}d', { braceExpansion: false }); // ['a{b,c}d']
fg.sync('a{b,c}d', { braceExpansion: true });  // ['abd', 'acd']
```

#### caseSensitiveMatch

* Type: `boolean`
* Default: `true`

Enables a [case-sensitive][wikipedia_case_sensitivity] mode for matching files.

```js
dir/
├── file.txt
└── File.txt
```

```js
fg.sync('file.txt', { caseSensitiveMatch: false }); // ['file.txt', 'File.txt']
fg.sync('file.txt', { caseSensitiveMatch: true });  // ['file.txt']
```

#### dot

* Type: `boolean`
* Default: `false`

Allow patterns to match entries that begin with a period (`.`).

> :book: Note that an explicit dot in a portion of the pattern will always match dot files.

```js
dir/
├── .editorconfig
└── package.json
```

```js
fg.sync('*', { dot: false }); // ['package.json']
fg.sync('*', { dot: true });  // ['.editorconfig', 'package.json']
```

#### extglob

* Type: `boolean`
* Default: `true`

Enables Bash-like `extglob` functionality.

> :1234: [Syntax description][micromatch_extglobs].

```js
dir/
├── README.md
└── package.json
```

```js
fg.sync('*.+(json|md)', { extglob: false }); // []
fg.sync('*.+(json|md)', { extglob: true });  // ['README.md', 'package.json']
```

#### globstar

* Type: `boolean`
* Default: `true`

Enables recursively repeats a pattern containing `**`. If `false`, `**` behaves exactly like `*`.

```js
dir/
└── a
    └── b
```

```js
fg.sync('**', { onlyFiles: false, globstar: false }); // ['a']
fg.sync('**', { onlyFiles: false, globstar: true });  // ['a', 'a/b']
```

#### baseNameMatch

* Type: `boolean`
* Default: `false`

If set to `true`, then patterns without slashes will be matched against the basename of the path if it contains slashes.

```js
dir/
└── one/
    └── file.md
```

```js
fg.sync('*.md', { baseNameMatch: false }); // []
fg.sync('*.md', { baseNameMatch: true });  // ['one/file.md']
```

## FAQ

## What is a static or dynamic pattern?

All patterns can be divided into two types:

* **static**. A pattern is considered static if it can be used to get an entry on the file system without using matching mechanisms. For example, the `file.js` pattern is a static pattern because we can just verify that it exists on the file system.
* **dynamic**. A pattern is considered dynamic if it cannot be used directly to find occurrences without using a matching mechanisms. For example, the `*` pattern is a dynamic pattern because we cannot use this pattern directly.

A pattern is considered dynamic if it contains the following characters (`…` — any characters or their absence) or options:

* The [`caseSensitiveMatch`](#casesensitivematch) option is disabled
* `\\` (the escape character)
* `*`, `?`, `!` (at the beginning of line)
* `[…]`
* `(…|…)`
* `@(…)`, `!(…)`, `*(…)`, `?(…)`, `+(…)` (respects the [`extglob`](#extglob) option)
* `{…,…}`, `{…..…}` (respects the [`braceExpansion`](#braceexpansion) option)

## How to write patterns on Windows?

Always use forward-slashes in glob expressions (patterns and [`ignore`](#ignore) option). Use backslashes for escaping characters. With the [`cwd`](#cwd) option use a convenient format.

**Bad**

```ts
[
	'directory\\*',
	path.join(process.cwd(), '**')
]
```

**Good**

```ts
[
	'directory/*',
	path.join(process.cwd(), '**').replace(/\\/g, '/')
]
```

> :book: Use the [`normalize-path`][npm_normalize_path] or the [`unixify`][npm_unixify] package to convert Windows-style path to a Unix-style path.

Read more about [matching with backslashes][micromatch_backslashes].

## Why are parentheses match wrong?

```js
dir/
└── (special-*file).txt
```

```js
fg.sync(['(special-*file).txt']) // []
```

Refers to Bash. You need to escape special characters:

```js
fg.sync(['\$special-*file\$.txt']) // ['(special-*file).txt']
```

Read more about [matching special characters as literals][picomatch_matching_special_characters_as_literals].

## How to exclude directory from reading?

You can use a negative pattern like this: `!**/node_modules` or `!**/node_modules/**`. Also you can use [`ignore`](#ignore) option. Just look at the example below.

```js
first/
├── file.md
└── second/
    └── file.txt
```

If you don't want to read the `second` directory, you must write the following pattern: `!**/second` or `!**/second/**`.

```js
fg.sync(['**/*.md', '!**/second']);                 // ['first/file.md']
fg.sync(['**/*.md'], { ignore: ['**/second/**'] }); // ['first/file.md']
```

> :warning: When you write `!**/second/**/*` it means that the directory will be **read**, but all the entries will not be included in the results.

You have to understand that if you write the pattern to exclude directories, then the directory will not be read under any circumstances.

## How to use UNC path?

You cannot use [Uniform Naming Convention (UNC)][unc_path] paths as patterns (due to syntax), but you can use them as [`cwd`](#cwd) directory.

```ts
fg.sync('*', { cwd: '\\\\?\\C:\\Python27' /* or //?/C:/Python27 */ });
fg.sync('Python27/*', { cwd: '\\\\?\\C:\\' /* or //?/C:/ */ });
```

## Compatible with `node-glob`?

## Benchmarks

### Server

Link: [Vultr Bare Metal][vultr_pricing_baremetal]

* Processor: E3-1270v6 (8 CPU)
* RAM: 32GB
* Disk: SSD ([Intel DC S3520 SSDSC2BB240G7][intel_ssd])

You can see results [here][github_gist_benchmark_server] for latest release.

### Nettop

Link: [Zotac bi323][zotac_bi323]

* Processor: Intel N3150 (4 CPU)
* RAM: 8GB
* Disk: SSD ([Silicon Power SP060GBSS3S55S25][silicon_power_ssd])

You can see results [here][github_gist_benchmark_nettop] for latest release.

## Changelog

See the [Releases section of our GitHub project][github_releases] for changelog for each release version.

## License

This software is released under the terms of the MIT license.

[bash_hackers_syntax_expansion_brace]: https://wiki.bash-hackers.org/syntax/expansion/brace
[github_gist_benchmark_nettop]: https://gist.github.com/mrmlnc/f06246b197f53c356895fa35355a367c#file-fg-benchmark-nettop-product-txt
[github_gist_benchmark_server]: https://gist.github.com/mrmlnc/f06246b197f53c356895fa35355a367c#file-fg-benchmark-server-product-txt
[github_releases]: https://github.com/mrmlnc/fast-glob/releases
[glob_definition]: https://en.wikipedia.org/wiki/Glob_(programming)
[glob_linux_man]: http://man7.org/linux/man-pages/man3/glob.3.html
[intel_ssd]: https://ark.intel.com/content/www/us/en/ark/products/93012/intel-ssd-dc-s3520-series-240gb-2-5in-sata-6gb-s-3d1-mlc.html
[micromatch_backslashes]: https://github.com/micromatch/micromatch#backslashes
[micromatch_braces]: https://github.com/micromatch/braces
[micromatch_extended_globbing]: https://github.com/micromatch/micromatch#extended-globbing
[micromatch_extglobs]: https://github.com/micromatch/micromatch#extglobs
[micromatch_regex_character_classes]: https://github.com/micromatch/micromatch#regex-character-classes
[micromatch]: https://github.com/micromatch/micromatch
[node_js_fs_class_fs_dirent]: https://nodejs.org/api/fs.html#fs_class_fs_dirent
[node_js_fs_class_fs_stats]: https://nodejs.org/api/fs.html#fs_class_fs_stats
[node_js_stream_readable_streams]: https://nodejs.org/api/stream.html#stream_readable_streams
[node_js]: https://nodejs.org/en
[nodelib_fs_scandir_old_and_modern_modern]: https://github.com/nodelib/nodelib/blob/master/packages/fs/fs.scandir/README.md#old-and-modern-mode
[npm_normalize_path]: https://www.npmjs.com/package/normalize-path
[npm_unixify]: https://www.npmjs.com/package/unixify
[paypal_mrmlnc]:https://paypal.me/mrmlnc
[picomatch_matching_behavior]: https://github.com/micromatch/picomatch#matching-behavior-vs-bash
[picomatch_matching_special_characters_as_literals]: https://github.com/micromatch/picomatch#matching-special-characters-as-literals
[picomatch_posix_brackets]: https://github.com/micromatch/picomatch#posix-brackets
[regular_expressions_brackets]: https://www.regular-expressions.info/brackets.html
[silicon_power_ssd]: https://www.silicon-power.com/web/product-1
[unc_path]: https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-dtyp/62e862f4-2a51-452e-8eeb-dc4ff5ee33cc
[vultr_pricing_baremetal]: https://www.vultr.com/pricing/baremetal
[wikipedia_case_sensitivity]: https://en.wikipedia.org/wiki/Case_sensitivity
[zotac_bi323]: https://www.zotac.com/ee/product/mini_pcs/zbox-bi323

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