How to use the errno.custom function in errno
To help you get started, we’ve selected a few errno examples, based on popular ways it is used in public projects.
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Level / leveldown / lib / errors.js View on Github 
/* Copyright (c) 2012-2013 LevelUP contributors
* See list at
* MIT +no-false-attribs License
*
*/
var createError = require('errno').custom.createError
, LevelUPError = createError('LevelUPError')
module.exports = {
LevelUPError : LevelUPError
, InitializationError : createError('InitializationError', LevelUPError)
, OpenError : createError('OpenError', LevelUPError)
, ReadError : createError('ReadError', LevelUPError)
, WriteError : createError('WriteError', LevelUPError)
, NotFoundError : createError('NotFoundError', LevelUPError)
}require.define("/src/errors.js",function(require,module,exports,__dirname,__filename,process,global){var errno = require('errno')
, LevelUPError = errno.custom.createError('LevelUPError')
module.exports = {
LevelUPError : LevelUPError
, InitializationError : errno.custom.createError('InitializationError', LevelUPError)
, OpenError : errno.custom.createError('OpenError', LevelUPError)
, ReadError : errno.custom.createError('ReadError', LevelUPError)
, WriteError : errno.custom.createError('WriteError', LevelUPError)
, NotFoundError : errno.custom.createError('NotFoundError', LevelUPError)
, CloseError : errno.custom.createError('CloseError', LevelUPError)
}
});require.define("/src/errors.js",function(require,module,exports,__dirname,__filename,process,global){var errno = require('errno')
, LevelUPError = errno.custom.createError('LevelUPError')
module.exports = {
LevelUPError : LevelUPError
, InitializationError : errno.custom.createError('InitializationError', LevelUPError)
, OpenError : errno.custom.createError('OpenError', LevelUPError)
, ReadError : errno.custom.createError('ReadError', LevelUPError)
, WriteError : errno.custom.createError('WriteError', LevelUPError)
, NotFoundError : errno.custom.createError('NotFoundError', LevelUPError)
, CloseError : errno.custom.createError('CloseError', LevelUPError)
}
});require.define("/src/errors.js",function(require,module,exports,__dirname,__filename,process,global){var errno = require('errno')
, LevelUPError = errno.custom.createError('LevelUPError')
module.exports = {
LevelUPError : LevelUPError
, InitializationError : errno.custom.createError('InitializationError', LevelUPError)
, OpenError : errno.custom.createError('OpenError', LevelUPError)
, ReadError : errno.custom.createError('ReadError', LevelUPError)
, WriteError : errno.custom.createError('WriteError', LevelUPError)
, NotFoundError : errno.custom.createError('NotFoundError', LevelUPError)
, CloseError : errno.custom.createError('CloseError', LevelUPError)
}
});var Promise = global.Promise || require('promise');
var fs = require('graceful-fs');
var path = require('path');
var EventEmitter = require('events').EventEmitter;
var pify = require('pify');
var mkdirp = require('mkdirp');
var del = require('del');
var junk = require('junk');
var errno = require('errno');
var maximatch = require('maximatch');
var slash = require('slash');
var emitterMixin = require('emitter-mixin');
var CopyError = errno.custom.createError('CopyError');
var EVENT_ERROR = 'error';
var EVENT_COMPLETE = 'complete';
var EVENT_CREATE_DIRECTORY_START = 'createDirectoryStart';
var EVENT_CREATE_DIRECTORY_ERROR = 'createDirectoryError';
var EVENT_CREATE_DIRECTORY_COMPLETE = 'createDirectoryComplete';
var EVENT_CREATE_SYMLINK_START = 'createSymlinkStart';
var EVENT_CREATE_SYMLINK_ERROR = 'createSymlinkError';
var EVENT_CREATE_SYMLINK_COMPLETE = 'createSymlinkComplete';
var EVENT_COPY_FILE_START = 'copyFileStart';
var EVENT_COPY_FILE_ERROR = 'copyFileError';
var EVENT_COPY_FILE_COMPLETE = 'copyFileComplete';
var mkdir = pify(mkdirp, Promise);
var stat = pify(fs.stat, Promise);
var lstat = pify(fs.lstat, Promise);require.define("/src/errors.js",function(require,module,exports,__dirname,__filename,process,global){var errno = require('errno')
, LevelUPError = errno.custom.createError('LevelUPError')
module.exports = {
LevelUPError : LevelUPError
, InitializationError : errno.custom.createError('InitializationError', LevelUPError)
, OpenError : errno.custom.createError('OpenError', LevelUPError)
, ReadError : errno.custom.createError('ReadError', LevelUPError)
, WriteError : errno.custom.createError('WriteError', LevelUPError)
, NotFoundError : errno.custom.createError('NotFoundError', LevelUPError)
, CloseError : errno.custom.createError('CloseError', LevelUPError)
}
});var Promise = global.Promise || require('promise');
var fs = require('graceful-fs');
var path = require('path');
var EventEmitter = require('events').EventEmitter;
var pify = require('pify');
var mkdirp = require('mkdirp');
var del = require('del');
var junk = require('junk');
var errno = require('errno');
var maximatch = require('maximatch');
var slash = require('slash');
var emitterMixin = require('emitter-mixin');
var CopyError = errno.custom.createError('CopyError');
var EVENT_ERROR = 'error';
var EVENT_COMPLETE = 'complete';
var EVENT_CREATE_DIRECTORY_START = 'createDirectoryStart';
var EVENT_CREATE_DIRECTORY_ERROR = 'createDirectoryError';
var EVENT_CREATE_DIRECTORY_COMPLETE = 'createDirectoryComplete';
var EVENT_CREATE_SYMLINK_START = 'createSymlinkStart';
var EVENT_CREATE_SYMLINK_ERROR = 'createSymlinkError';
var EVENT_CREATE_SYMLINK_COMPLETE = 'createSymlinkComplete';
var EVENT_COPY_FILE_START = 'copyFileStart';
var EVENT_COPY_FILE_ERROR = 'copyFileError';
var EVENT_COPY_FILE_COMPLETE = 'copyFileComplete';
var mkdir = pify(mkdirp, Promise);
var stat = pify(fs.stat, Promise);
var lstat = pify(fs.lstat, Promise);
