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+'use strict'
+// This is adapted from https://github.com/normalize/mz
+// Copyright (c) 2014-2016 Jonathan Ong me@jongleberry.com and Contributors
+const u = require('universalify').fromCallback
+const fs = require('graceful-fs')
+
+const api = [
+ 'access',
+ 'appendFile',
+ 'chmod',
+ 'chown',
+ 'close',
+ 'copyFile',
+ 'fchmod',
+ 'fchown',
+ 'fdatasync',
+ 'fstat',
+ 'fsync',
+ 'ftruncate',
+ 'futimes',
+ 'lchown',
+ 'lchmod',
+ 'link',
+ 'lstat',
+ 'mkdir',
+ 'mkdtemp',
+ 'open',
+ 'readFile',
+ 'readdir',
+ 'readlink',
+ 'realpath',
+ 'rename',
+ 'rmdir',
+ 'stat',
+ 'symlink',
+ 'truncate',
+ 'unlink',
+ 'utimes',
+ 'writeFile'
+].filter(key => {
+ // Some commands are not available on some systems. Ex:
+ // fs.copyFile was added in Node.js v8.5.0
+ // fs.mkdtemp was added in Node.js v5.10.0
+ // fs.lchown is not available on at least some Linux
+ return typeof fs[key] === 'function'
+})
+
+// Export all keys:
+Object.keys(fs).forEach(key => {
+ if (key === 'promises') {
+ // fs.promises is a getter property that triggers ExperimentalWarning
+ // Don't re-export it here, the getter is defined in "lib/index.js"
+ return
+ }
+ exports[key] = fs[key]
+})
+
+// Universalify async methods:
+api.forEach(method => {
+ exports[method] = u(fs[method])
+})
+
+// We differ from mz/fs in that we still ship the old, broken, fs.exists()
+// since we are a drop-in replacement for the native module
+exports.exists = function (filename, callback) {
+ if (typeof callback === 'function') {
+ return fs.exists(filename, callback)
+ }
+ return new Promise(resolve => {
+ return fs.exists(filename, resolve)
+ })
+}
+
+// fs.read() & fs.write need special treatment due to multiple callback args
+
+exports.read = function (fd, buffer, offset, length, position, callback) {
+ if (typeof callback === 'function') {
+ return fs.read(fd, buffer, offset, length, position, callback)
+ }
+ return new Promise((resolve, reject) => {
+ fs.read(fd, buffer, offset, length, position, (err, bytesRead, buffer) => {
+ if (err) return reject(err)
+ resolve({ bytesRead, buffer })
+ })
+ })
+}
+
+// Function signature can be
+// fs.write(fd, buffer[, offset[, length[, position]]], callback)
+// OR
+// fs.write(fd, string[, position[, encoding]], callback)
+// We need to handle both cases, so we use ...args
+exports.write = function (fd, buffer, ...args) {
+ if (typeof args[args.length - 1] === 'function') {
+ return fs.write(fd, buffer, ...args)
+ }
+
+ return new Promise((resolve, reject) => {
+ fs.write(fd, buffer, ...args, (err, bytesWritten, buffer) => {
+ if (err) return reject(err)
+ resolve({ bytesWritten, buffer })
+ })
+ })
+}
+
+// fs.realpath.native only available in Node v9.2+
+if (typeof fs.realpath.native === 'function') {
+ exports.realpath.native = u(fs.realpath.native)
+}