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Node.js: fs-extra ================= `fs-extra` adds file system methods that aren't included in the native `fs` module and adds promise support to the `fs` methods. It also uses [`graceful-fs`](https://github.com/isaacs/node-graceful-fs) to prevent `EMFILE` errors. It should be a drop in replacement for `fs`. [](https://www.npmjs.org/package/fs-extra) [](https://github.com/jprichardson/node-fs-extra/blob/master/LICENSE) [](http://travis-ci.org/jprichardson/node-fs-extra) [](https://ci.appveyor.com/project/jprichardson/node-fs-extra/branch/master) [](https://www.npmjs.org/package/fs-extra) [](https://coveralls.io/github/jprichardson/node-fs-extra) [](https://standardjs.com) Why? ---- I got tired of including `mkdirp`, `rimraf`, and `ncp` in most of my projects. Installation ------------ npm install fs-extra Usage ----- `fs-extra` is a drop in replacement for native `fs`. All methods in `fs` are attached to `fs-extra`. All `fs` methods return promises if the callback isn't passed. You don't ever need to include the original `fs` module again: ```js const fs = require('fs') // this is no longer necessary ``` you can now do this: ```js const fs = require('fs-extra') ``` or if you prefer to make it clear that you're using `fs-extra` and not `fs`, you may want to name your `fs` variable `fse` like so: ```js const fse = require('fs-extra') ``` you can also keep both, but it's redundant: ```js const fs = require('fs') const fse = require('fs-extra') ``` Sync vs Async vs Async/Await ------------- Most methods are async by default. All async methods will return a promise if the callback isn't passed. Sync methods on the other hand will throw if an error occurs. Also Async/Await will throw an error if one occurs. Example: ```js const fs = require('fs-extra') // Async with promises: fs.copy('/tmp/myfile', '/tmp/mynewfile') .then(() => console.log('success!')) .catch(err => console.error(err)) // Async with callbacks: fs.copy('/tmp/myfile', '/tmp/mynewfile', err => { if (err) return console.error(err) console.log('success!') }) // Sync: try { fs.copySync('/tmp/myfile', '/tmp/mynewfile') console.log('success!') } catch (err) { console.error(err) } // Async/Await: async function copyFiles () { try { await fs.copy('/tmp/myfile', '/tmp/mynewfile') console.log('success!') } catch (err) { console.error(err) } } copyFiles() ``` Methods ------- ### Async - [copy](docs/copy.md) - [emptyDir](docs/emptyDir.md) - [ensureFile](docs/ensureFile.md) - [ensureDir](docs/ensureDir.md) - [ensureLink](docs/ensureLink.md) - [ensureSymlink](docs/ensureSymlink.md) - [mkdirp](docs/ensureDir.md) - [mkdirs](docs/ensureDir.md) - [move](docs/move.md) - [outputFile](docs/outputFile.md) - [outputJson](docs/outputJson.md) - [pathExists](docs/pathExists.md) - [readJson](docs/readJson.md) - [remove](docs/remove.md) - [writeJson](docs/writeJson.md) ### Sync - [copySync](docs/copy-sync.md) - [emptyDirSync](docs/emptyDir-sync.md) - [ensureFileSync](docs/ensureFile-sync.md) - [ensureDirSync](docs/ensureDir-sync.md) - [ensureLinkSync](docs/ensureLink-sync.md) - [ensureSymlinkSync](docs/ensureSymlink-sync.md) - [mkdirpSync](docs/ensureDir-sync.md) - [mkdirsSync](docs/ensureDir-sync.md) - [moveSync](docs/move-sync.md) - [outputFileSync](docs/outputFile-sync.md) - [outputJsonSync](docs/outputJson-sync.md) - [pathExistsSync](docs/pathExists-sync.md) - [readJsonSync](docs/readJson-sync.md) - [removeSync](docs/remove-sync.md) - [writeJsonSync](docs/writeJson-sync.md) **NOTE:** You can still use the native Node.js methods. They are promisified and copied over to `fs-extra`. See [notes on `fs.read()`, `fs.write()`, & `fs.writev()`](docs/fs-read-write-writev.md) ### What happened to `walk()` and `walkSync()`? They were removed from `fs-extra` in v2.0.0. If you need the functionality, `walk` and `walkSync` are available as separate packages, [`klaw`](https://github.com/jprichardson/node-klaw) and [`klaw-sync`](https://github.com/manidlou/node-klaw-sync). Third Party ----------- ### CLI [fse-cli](https://www.npmjs.com/package/@atao60/fse-cli) allows you to run `fs-extra` from a console or from [npm](https://www.npmjs.com) scripts. ### TypeScript If you like TypeScript, you can use `fs-extra` with it: https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/fs-extra ### File / Directory Watching If you want to watch for changes to files or directories, then you should use [chokidar](https://github.com/paulmillr/chokidar). ### Obtain Filesystem (Devices, Partitions) Information [fs-filesystem](https://github.com/arthurintelligence/node-fs-filesystem) allows you to read the state of the filesystem of the host on which it is run. It returns information about both the devices and the partitions (volumes) of the system. ### Misc. - [fs-extra-debug](https://github.com/jdxcode/fs-extra-debug) - Send your fs-extra calls to [debug](https://npmjs.org/package/debug). - [mfs](https://github.com/cadorn/mfs) - Monitor your fs-extra calls. Hacking on fs-extra ------------------- Wanna hack on `fs-extra`? Great! Your help is needed! [fs-extra is one of the most depended upon Node.js packages](http://nodei.co/npm/fs-extra.png?downloads=true&downloadRank=true&stars=true). This project uses [JavaScript Standard Style](https://github.com/feross/standard) - if the name or style choices bother you, you're gonna have to get over it :) If `standard` is good enough for `npm`, it's good enough for `fs-extra`. [](https://github.com/feross/standard) What's needed? - First, take a look at existing issues. Those are probably going to be where the priority lies. - More tests for edge cases. Specifically on different platforms. There can never be enough tests. - Improve test coverage. See coveralls output for more info. Note: If you make any big changes, **you should definitely file an issue for discussion first.** ### Running the Test Suite fs-extra contains hundreds of tests. - `npm run lint`: runs the linter ([standard](http://standardjs.com/)) - `npm run unit`: runs the unit tests - `npm test`: runs both the linter and the tests ### Windows If you run the tests on the Windows and receive a lot of symbolic link `EPERM` permission errors, it's because on Windows you need elevated privilege to create symbolic links. You can add this to your Windows's account by following the instructions here: http://superuser.com/questions/104845/permission-to-make-symbolic-links-in-windows-7 However, I didn't have much luck doing this. Since I develop on Mac OS X, I use VMWare Fusion for Windows testing. I create a shared folder that I map to a drive on Windows. I open the `Node.js command prompt` and run as `Administrator`. I then map the network drive running the following command: net use z: "\\vmware-host\Shared Folders" I can then navigate to my `fs-extra` directory and run the tests. Naming ------ I put a lot of thought into the naming of these functions. Inspired by @coolaj86's request. So he deserves much of the credit for raising the issue. See discussion(s) here: * https://github.com/jprichardson/node-fs-extra/issues/2 * https://github.com/flatiron/utile/issues/11 * https://github.com/ryanmcgrath/wrench-js/issues/29 * https://github.com/substack/node-mkdirp/issues/17 First, I believe that in a