fs.js•1.04 kB
var Promise = require('any-promise')
var fs
try {
fs = require('graceful-fs')
} catch(err) {
fs = require('fs')
}
var api = [
'appendFile',
'chmod',
'chown',
'close',
'fchmod',
'fchown',
'fdatasync',
'fstat',
'fsync',
'ftruncate',
'futimes',
'lchown',
'link',
'lstat',
'mkdir',
'open',
'read',
'readFile',
'readdir',
'readlink',
'realpath',
'rename',
'rmdir',
'stat',
'symlink',
'truncate',
'unlink',
'utimes',
'write',
'writeFile'
]
typeof fs.access === 'function' && api.push('access')
typeof fs.copyFile === 'function' && api.push('copyFile')
typeof fs.mkdtemp === 'function' && api.push('mkdtemp')
require('thenify-all').withCallback(fs, exports, api)
exports.exists = function (filename, callback) {
// callback
if (typeof callback === 'function') {
return fs.stat(filename, function (err) {
callback(null, !err);
})
}
// or promise
return new Promise(function (resolve) {
fs.stat(filename, function (err) {
resolve(!err)
})
})
}