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The 'to-vfile' npm package is a utility for working with virtual files in Node.js. It allows you to create, read, write, and manipulate file objects in memory, which can be particularly useful for processing files in a pipeline without needing to interact with the filesystem directly.
Creating a virtual file
This feature allows you to create a virtual file object with specified path and contents. The file object can then be manipulated in memory.
const vfile = require('to-vfile');
const file = vfile({ path: 'example.txt', contents: 'Hello, world!' });
console.log(file);
Reading a file from the filesystem
This feature allows you to read a file from the filesystem into a virtual file object. The contents of the file are loaded into memory, and you can manipulate the file object as needed.
const vfile = require('to-vfile');
vfile.read('example.txt', 'utf8', (err, file) => {
if (err) throw err;
console.log(file);
});
Writing a virtual file to the filesystem
This feature allows you to write a virtual file object to the filesystem. The contents of the virtual file are saved to the specified path.
const vfile = require('to-vfile');
const file = vfile({ path: 'example.txt', contents: 'Hello, world!' });
vfile.write(file, err => {
if (err) throw err;
console.log('File written!');
});
Vinyl is a similar package that provides a virtual file format. It is commonly used in the Gulp ecosystem for handling file transformations in memory. Compared to 'to-vfile', Vinyl is more focused on stream-based workflows and integrates tightly with Gulp.
Memfs is a package that provides an in-memory filesystem. It allows you to perform filesystem operations in memory, which can be useful for testing and mocking. While 'to-vfile' focuses on individual file objects, Memfs provides a broader filesystem abstraction.
Create a vfile
from a filepath.
Optionally populates them from the file system as well.
Can write virtual files to file system too.
This package is ESM only:
Node 12+ is needed to use it and it must be import
ed instead of require
d.
npm:
npm install to-vfile
import {toVFile, readSync} from 'to-vfile'
console.log(toVFile('readme.md'))
console.log(toVFile(new URL('./readme.md', import.meta.url)))
console.log(readSync('.git/HEAD'))
console.log(readSync('.git/HEAD', 'utf8'))
Yields:
VFile {
data: {},
messages: [],
history: ['readme.md'],
cwd: '/Users/tilde/projects/oss/to-vfile'
}
VFile {
data: {},
messages: [],
history: ['readme.md'],
cwd: '/Users/tilde/projects/oss/to-vfile'
}
VFile {
data: {},
messages: [],
history: ['.git/HEAD'],
cwd: '/Users/tilde/projects/oss/to-vfile',
value: <Buffer 72 65 66 3a 20 72 65 66 73 2f 68 65 61 64 73 2f 6d 61 73 74 65 72 0a>
}
VFile {
data: {},
messages: [],
history: ['.git/HEAD'],
cwd: '/Users/tilde/projects/oss/to-vfile',
value: 'ref: refs/heads/main\n'
}
This package exports the following identifiers: toVFile
, read
, readSync
,
write
, and writeSync
.
There is no default export.
toVFile(options)
Create a virtual file.
Works like the vfile constructor, except when options
is string
or
Buffer
, in which case it’s treated as {path: options}
instead of
{value: options}
, or when options
is a WHATWG URL
object, in which case
it’s treated as {path: fileURLToPath(options)}
.
read(options[, encoding][, callback])
Creates a virtual file from options (toVFile(options)
), reads the file from
the file system and populates file.value
with the result.
If encoding
is specified, it’s passed to fs.readFile
.
If callback
is given, invokes it with either an error or the populated virtual
file.
If callback
is not given, returns a Promise
that is rejected with
an error or resolved with the populated virtual file.
readSync(options[, encoding])
Like read
but synchronous.
Either throws an error or returns a populated virtual file.
write(options[, fsOptions][, callback])
Creates a virtual file from options
(toVFile(options)
), writes the file to
the file system.
fsOptions
are passed to fs.writeFile
.
If callback
is given, invokes it with an error, if any.
If callback
is not given, returns a Promise
that is rejected with
an error or resolved with the written virtual file.
writeSync(options[, fsOptions])
Like write
but synchronous.
Either throws an error or returns a populated virtual file.
See contributing.md
in vfile/.github
for ways to
get started.
See support.md
for ways to get help.
This project has a code of conduct. By interacting with this repository, organization, or community you agree to abide by its terms.
FAQs
vfile utility to read and write to the file system
The npm package to-vfile receives a total of 237,779 weekly downloads. As such, to-vfile popularity was classified as popular.
We found that to-vfile demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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