vinyl-fs

What is vinyl-fs?

The vinyl-fs npm package is a module that allows you to handle file operations in a virtual file format known as Vinyl. It is commonly used in the Gulp build system to read and write files, watch file changes, and manage file streams. Vinyl-fs abstracts file details and provides a consistent API to manipulate files regardless of the source (local file system, remote, etc.).

What are vinyl-fs's main functionalities?

Reading Files

This feature allows you to read files from the filesystem using glob patterns. The example code demonstrates how to read all JavaScript files in the 'src' directory and log their paths.

const { src } = require('vinyl-fs');

src('src/*.js')
  .on('data', function(file) {
    console.log(file.path);
  });

Writing Files

This feature enables writing files to a specified directory. The code sample shows how to copy all JavaScript files from the 'src' directory to the 'output' directory.

const { src, dest } = require('vinyl-fs');

src('src/*.js')
  .pipe(dest('output/'));

Watching File Changes

This feature is useful for setting up a watch on files to perform actions when changes are detected. The example sets up a watcher on all JavaScript files in the 'src' directory and logs a message whenever a file changes.

const { watch } = require('vinyl-fs');

watch('src/**/*.js', function(cb) {
  console.log('File changed.');
  cb();
});

Other packages similar to vinyl-fs

graceful-fs

graceful-fs is a drop-in replacement for the fs module with improvements for handling file system operations more gracefully. It does not provide the virtual file abstraction that vinyl-fs offers but enhances file system reliability, especially under high load.

through2

through2 is a thin wrapper around Node.js streams.Transform (Streams2/3) to avoid explicit subclassing noise. It's similar to vinyl-fs in that it helps with stream manipulation, but it does not deal directly with file system operations or virtual file objects.

fs-extra

fs-extra adds file system methods that aren't included in the native fs module and adds promise support to fs methods. It is similar to vinyl-fs in providing more utilities for file operations, but it does not use the Vinyl abstraction or integrate directly with streaming pipelines.

README

vinyl-fs

Information

Package	vinyl-fs
Description	Vinyl adapter for the file system
Node Version	>= 0.10

Usage

var map = require('map-stream');
var fs = require('vinyl-fs');

var log = function(file, cb) {
  console.log(file.path);
  cb(null, file);
};

fs.src(['./js/**/*.js', '!./js/vendor/*.js'])
  .pipe(map(log))
  .pipe(fs.dest('./output'));

API

src(globs[, opt])

• Takes a glob string or an array of glob strings as the first argument.
• Possible options for the second argument:
  • cwd - Specify the working directory the folder is relative to. Default is process.cwd()
  • base - Specify the folder relative to the cwd. Default is where the glob begins. This is used to determine the file names when saving in .dest()
  • buffer - true or false if you want to buffer the file.
    • Default value is true
    • false will make file.contents a paused Stream
  • read - true or false if you want the file to be read or not. Useful for stuff like rming files.
    • Default value is true
    • false will disable writing the file to disk via .dest()
  • Any glob-related options are documented in glob-stream and node-glob
• Returns a Readable/Writable stream.
• On write the stream will simply pass items through.
• This stream emits matching vinyl File objects

watch(globs[, opt, cb])

This is just glob-watcher

• Takes a glob string or an array of glob strings as the first argument.
• Possible options for the second argument:
  • Any options are passed to gaze
• Returns an EventEmitter
  • 'changed' event is emitted on each file change
• Optionally calls the callback on each change event

dest(folder[, opt])

• Takes a folder path as the first argument.
• First argument can also be a function that takes in a file and returns a folder path.
• Possible options for the second argument:
  • cwd - Specify the working directory the folder is relative to. Default is process.cwd()
  • mode - Specify the mode the files should be created with. Default is the mode of the input file (file.stat.mode)
• Returns a Readable/Writable stream.
• On write the stream will save the vinyl File to disk at the folder/cwd specified.
• After writing the file to disk, it will be emitted from the stream so you can keep piping these around
• The file will be modified after being written to this stream
  • cwd, base, and path will be overwritten to match the folder
  • stat.mode will be overwritten if you used a mode parameter
  • contents will have it's position reset to the beginning if it is a stream