fs-exists-nodeback

This Node.js module adds support for nodeback-style callbacks to fs.exists without breaking backward compatibility.

The “error-first” callback (also known as an "nodeback", “errorback”, “errback”, or “node-style callback”) has become the standard for Node.js callbacks. One unfortunate exception to this is fs.exists(path, callback) function provided by Node.js core library.

The fs-exist-nodeback module polyfills fs.exists so that it remains backward compatible with the original Node.js callback style while simultaneously adding transparent support for nodeback-style callback functions.

Internal system level features or functionality of fs.exists are not modified in any way.

Installation

$ npm install fs-exists-nodeback

Usage

require('fs-exists-nodeback');

That's it! Now fs.exists supports nodeback-style callbacks while still remaining backward compatible with existing code.

Nodeback-style is supported:

var fs = require('fs');
 
fs.exists('./', function (err, exists) {
    if (err) return console.err(err);
    console.log('exists: ' + exists);
});

Node.js original callback style is supported:

var fs = require('fs');
 
fs.exists('./', function (exists) {
    console.log('exists: ' + exists);
});

Compatibility

fs-exists-nodeback is compatible with Node.js and io.js version 0.8 or newer.

Travis CI tests are run for all released versions of Node.js.

Testing

$ npm test

Contributing

You can find the repository at: https://github.com/imyller/node-fs-exists-nodeback

Issues/Feature Requests can be submitted at: https://github.com/imyller/node-fs-exists-nodeback/issues

I'd really like to hear your feedback, and I'd love to receive your pull-requests!

Copyright

Copyright 2016 Ilkka Myller. This software is licensed under the MIT License, see LICENSE for details.