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Docs: Update src() documentation
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sidebar_label: src()
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# `gulp.src(globs[, options])`
# src()

Emits files matching provided glob or array of globs.
Returns a [stream] of [Vinyl files] that can be [piped] to plugins.
Creates a stream for reading [Vinyl][vinyl-concepts] objects from the file system.

```javascript
gulp.src('client/templates/*.pug')
.pipe(pug())
.pipe(minify())
.pipe(gulp.dest('build/minified_templates'));
```

`glob` refers to [node-glob syntax][node-glob] or it can be a direct file path.

## globs
Type: `String` or `Array`

Glob or array of globs to read. Globs use [node-glob syntax] except that negation is fully supported.
**Note:** Any UTF-8 BOMs will be removed from UTF-8 files read by `src()`, unless disabled using the `removeBOM` option.

A glob that begins with `!` excludes matching files from the glob results up to that point. For example, consider this directory structure:

client/
a.js
bob.js
bad.js

The following expression matches `a.js` and `bad.js`:

gulp.src(['client/*.js', '!client/b*.js', 'client/bad.js'])
## Usage

```javascript
const { src, dest } = require('gulp');

Note that globs are evaluated in order, which means this is possible:
function copy() {
return src('input/*.js')
.pipe(dest('output/'));
}

```js
// exclude every JS file that starts with a b except bad.js
gulp.src(['*.js', '!b*.js', 'bad.js'])
exports.copy = copy;
```

**Note:** glob symlink following behavior is opt-in and you must specify
`follow: true` in the options object that is passed to [node-glob].

## options
Type: `Object`

Options to pass to [node-glob] through [glob-stream].

gulp adds some additional options in addition to the
[options supported by node-glob][node-glob documentation] and [glob-stream]:

### options.cwd

The working directory the folder is relative to.

Type: `String`

Default: `process.cwd()`


### options.buffer
Type: `Boolean`

Default: `true`

Setting this to `false` will return `file.contents` as a stream and not
buffer files. This is useful when working with large files.

**Note:** Plugins might not implement support for streams.

### options.read
Type: `Boolean`

Default: `true`

Setting this to `false` will return `file.contents` as null and not read
the file at all.

### options.base
Type: `String`

Default: everything before a glob starts (see [glob-parent])

E.g., consider `somefile.js` in `client/js/somedir`:
## Signature

```js
// Matches 'client/js/somedir/somefile.js' and resolves `base` to `client/js/`
gulp.src('client/js/**/*.js')
.pipe(minify())
.pipe(gulp.dest('build')); // Writes 'build/somedir/somefile.js'

gulp.src('client/js/**/*.js', { base: 'client' })
.pipe(minify())
.pipe(gulp.dest('build')); // Writes 'build/js/somedir/somefile.js'
src(globs, [options])
```

### options.since
Type: `Date` or `Number`

Setting this to a Date or a time stamp will discard any file that have not been
modified since the time specified.

### options.passthrough
Type: `Boolean`

Default: `false`

If true, it will create a duplex stream which passes items through and
emits globbed files.

### options.allowEmpty
Type: `Boolean`

Default: `false`
### Parameters

| parameter | type | note |
|:--------------:|:------:|-------|
| globs | string <br> array | [Globs][globs-concepts] to watch on the file system. |
| options | object | Detailed in [Options][options-section] below. |

### Returns

A stream that can be used at the beginning or in the middle of a pipeline to add files based on the given globs.

### Errors

When the `globs` argument can only match one file (such as `foo/bar.js`) and no match is found, throws an error with the message, "File not found with singular glob". To suppress this error, set the `allowEmpty` option to `true`.

When an invalid glob is given in `globs`, throws an error with the message, "Invalid glob argument".

### Options

**For options that accept a function, the passed function will be called with each Vinyl object and must return a value of another listed type.**


| name | type | default | note |
|:--------:|:------:|------------|--------|
| buffer | boolean <br> function | true | When true, file contents are buffered into memory. If false, the Vinyl object's `contents` property will be a paused stream. Contents of large files may not be able to be buffered. <br> **Note:** Plugins may not implement support for streaming contents. |
| read | boolean <br> function | true | If false, files will be not be read and their Vinyl objects won't be writable to disk via `.dest()`. |
| since | date <br> timestamp <br> function | | When set, only creates Vinyl objects for files that have been modified since the specified time. |
| removeBOM | boolean <br> function | true | When true, removes the BOM from UTF-8 encoded files. If false, ignores a BOM.. |
| sourcemaps | boolean <br> function | false | If true, enables [sourcemaps][sourcemaps-section] support on Vinyl objects created. Loads inline sourcemaps and resolves external sourcemap links. |
| resolveSymlinks | boolean <br> function | true | When true, recursively resolves symbolic links to their targets. If false, preserves the symbolic links and sets the Vinyl object's `symlink` property to the original file's path. |
| cwd | string | `process.cwd()` | The directory that will be combined with any relative path to form an absolute path. Is ignored for absolute paths. Use to avoid combining `globs` with `path.join()`. <br> _This option is passed directly to [glob-stream][glob-stream-external]._ |
| base | string | | Explicitly set the `base` property on created Vinyl objects. Detailed in [API Concepts][glob-base-concepts]. <br> _This option is passed directly to [glob-stream][glob-stream-external]._ |
| cwdbase | boolean | false | If true, `cwd` and `base` options should be aligned. <br> _This option is passed directly to [glob-stream][glob-stream-external]._ |
| root | string | | The root path that `globs` are resolved against. <br> _This option is passed directly to [glob-stream][glob-stream-external]._ |
| allowEmpty | boolean | false | When false, `globs` which can only match one file (such as `foo/bar.js`) causes an error to be thrown if they don't find a match. If true, suppresses glob failures. <br> _This option is passed directly to [glob-stream][glob-stream-external]._ |
| uniqueBy | string <br> function | `'path'` | Remove duplicates from the stream by comparing the string property name or the result of the function. <br> **Note:** When using a function, the function receives the streamed data (objects containing `cwd`, `base`, `path` properties). |
| dot | boolean | false | If true, compare globs against dot files, like `.gitignore`. <br> _This option is passed directly to [node-glob][node-glob-external]._ |
| silent | boolean | true | When true, suppresses warnings from printing on `stderr`. <br> **Note:** This option is passed directly to [node-glob][node-glob-external] but defaulted to `true` instead of `false`. |
| mark | boolean | false | If true, a `/` character will be appended to directory matches. Generally not needed because paths are normalized within the pipeline. <br> _This option is passed directly to [node-glob][node-glob-external]._ |
| nosort | boolean | false | If true, disables sorting the glob results. <br> _This option is passed directly to [node-glob][node-glob-external]._ |
| stat | boolean | false | If true, `fs.stat()` is called on all results. This adds extra overhead and generally should not be used. <br> _This option is passed directly to [node-glob][node-glob-external]._ |
| strict | boolean | false | If true, an error will be thrown if an unexpected problem is encountered while attempting to read a directory. <br> _This option is passed directly to [node-glob][node-glob-external]._ |
| nounique | boolean | false | When false, prevents duplicate files in the result set. <br> _This option is passed directly to [node-glob][node-glob-external]._ |
| debug | boolean | false | If true, debugging information will be logged to the command line. <br> _This option is passed directly to [node-glob][node-glob-external]._ |
| nobrace | boolean | false | If true, avoids expanding brace sets - e.g. `{a,b}` or `{1..3}`. <br> _This option is passed directly to [node-glob][node-glob-external]._ |
| noglobstar | boolean | false | If true, treats double-star glob character as single-star glob character. <br> _This option is passed directly to [node-glob][node-glob-external]._ |
| noext | boolean | false | If true, avoids matching [extglob][extglob-docs] patterns - e.g. `+(ab)`. <br> _This option is passed directly to [node-glob][node-glob-external]._ |
| nocase | boolean | false | If true, performs a case-insensitive match. <br> **Note:** On case-insensitive file systems, non-magic patterns will match by default. <br> _This option is passed directly to [node-glob][node-glob-external]._ |
| matchBase | boolean | false | If true and globs don't contain any `/` characters, traverses all directories and matches that glob - e.g. `*.js` would be treated as equivalent to `**/*.js`. <br> _This option is passed directly to [node-glob][node-glob-external]._ |
| nodir | boolean | false | If true, only matches files, not directories. <br> **Note:** To match only directories, end your glob with a `/`. <br> _This option is passed directly to [node-glob][node-glob-external]._ |
| ignore | string <br> array | | Globs to exclude from matches. This option is combined with negated `globs`. <br> **Note:** These globs are always matched against dot files, regardless of any other settings. <br> _This option is passed directly to [node-glob][node-glob-external]._ |
| follow | boolean | false | If true, symlinked directories will be traversed when expanding `**` globs. <br> **Note:** This can cause problems with cyclical links. <br> _This option is passed directly to [node-glob][node-glob-external]._ |
| realpath | boolean | false | If true, `fs.realpath()` is called on all results. This may result in dangling links. <br> _This option is passed directly to [node-glob][node-glob-external]._ |
| cache | object | | A previously generated cache object - avoids some file system calls. <br> _This option is passed directly to [node-glob][node-glob-external]._ |
| statCache | object | | A previously generated cache of `fs.Stat` results - avoids some file system calls. <br> _This option is passed directly to [node-glob][node-glob-external]._ |
| symlinks | object | | A previously generated cache of symbolic links - avoids some file system calls. <br> _This option is passed directly to [node-glob][node-glob-external]._ |
| nocomment | boolean | false | When false, treat a `#` character at the start of a glob as a comment. <br> _This option is passed directly to [node-glob][node-glob-external]._ |

## Sourcemaps

Sourcemap support is built directly into `src()` and `dest()`, but is disabled by default. Enable it to produce inline or external sourcemaps.

Inline sourcemaps:
```js
const { src, dest } = require('gulp');
const uglify = require('gulp-uglify');

When true, will allow singular globs to fail to match. Otherwise, globs which are only supposed to match one file (such as `./foo/bar.js`) will cause an error to be thrown if they don't match.
src('input/**/*.js', { sourcemaps: true })
.pipe(uglify())
.pipe(dest('output/', { sourcemaps: true }));
```

External sourcemaps:
```js
// Emits an error if app/scripts.js doesn't exist
gulp.src('app/scripts.js')
.pipe(...);
const { src, dest } = require('gulp');
const uglify = require('gulp-uglify');

// Won't emit an error
gulp.src('app/scripts.js', { allowEmpty: true })
.pipe(...);
src('input/**/*.js', { sourcemaps: true })
.pipe(uglify())
.pipe(dest('output/', { sourcemaps: '.' }));
```

[glob-stream]: https://github.com/gulpjs/glob-stream
[glob-parent]: https://github.com/es128/glob-parent
[node-glob documentation]: https://github.com/isaacs/node-glob#options
[node-glob]: https://github.com/isaacs/node-glob
[piped]: http://nodejs.org/api/stream.html#stream_readable_pipe_destination_options
[stream]: http://nodejs.org/api/stream.html
[Vinyl files]: https://github.com/gulpjs/vinyl-fs
[sourcemaps-section]: #sourcemaps
[options-section]: #options
[vinyl-concepts]: concepts.md#vinyl
[glob-base-concepts]: concepts.md#glob-base
[globs-concepts]: concepts.md#globs
[extglob-docs]: LINK_NEEDED
[node-glob-external]: https://github.com/isaacs/node-glob
[glob-stream-external]: https://github.com/gulpjs/glob-stream

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