You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
125 lines
3.4 KiB
125 lines
3.4 KiB
# memfs
|
|
|
|
[![][chat-badge]][chat] [![][npm-badge]][npm-url] [![][travis-badge]][travis-url]
|
|
|
|
In-memory file-system with [Node's `fs` API](https://nodejs.org/api/fs.html).
|
|
|
|
- Node's `fs` API implemented, see [_old API Status_](./docs/api-status.md), [missing list](https://github.com/streamich/memfs/issues/735), [missing `opendir`](https://github.com/streamich/memfs/issues/663)
|
|
- Stores files in memory, in `Buffer`s
|
|
- Throws sameish\* errors as Node.js
|
|
- Has concept of _i-nodes_
|
|
- Implements _hard links_
|
|
- Implements _soft links_ (aka symlinks, symbolic links)
|
|
- Permissions may\* be implemented in the future
|
|
- Can be used in browser, see [`memfs-webpack`](https://github.com/streamich/memfs-webpack)
|
|
|
|
### Install
|
|
|
|
```shell
|
|
npm install --save memfs
|
|
```
|
|
|
|
## Usage
|
|
|
|
```js
|
|
import { fs } from 'memfs';
|
|
|
|
fs.writeFileSync('/hello.txt', 'World!');
|
|
fs.readFileSync('/hello.txt', 'utf8'); // World!
|
|
```
|
|
|
|
Create a file system from a plain JSON:
|
|
|
|
```js
|
|
import { fs, vol } from 'memfs';
|
|
|
|
const json = {
|
|
'./README.md': '1',
|
|
'./src/index.js': '2',
|
|
'./node_modules/debug/index.js': '3',
|
|
};
|
|
vol.fromJSON(json, '/app');
|
|
|
|
fs.readFileSync('/app/README.md', 'utf8'); // 1
|
|
vol.readFileSync('/app/src/index.js', 'utf8'); // 2
|
|
```
|
|
|
|
Export to JSON:
|
|
|
|
```js
|
|
vol.writeFileSync('/script.sh', 'sudo rm -rf *');
|
|
vol.toJSON(); // {"/script.sh": "sudo rm -rf *"}
|
|
```
|
|
|
|
Use it for testing:
|
|
|
|
```js
|
|
vol.writeFileSync('/foo', 'bar');
|
|
expect(vol.toJSON()).toEqual({ '/foo': 'bar' });
|
|
```
|
|
|
|
Create as many filesystem volumes as you need:
|
|
|
|
```js
|
|
import { Volume } from 'memfs';
|
|
|
|
const vol = Volume.fromJSON({ '/foo': 'bar' });
|
|
vol.readFileSync('/foo'); // bar
|
|
|
|
const vol2 = Volume.fromJSON({ '/foo': 'bar 2' });
|
|
vol2.readFileSync('/foo'); // bar 2
|
|
```
|
|
|
|
Use `memfs` together with [`unionfs`][unionfs] to create one filesystem
|
|
from your in-memory volumes and the real disk filesystem:
|
|
|
|
```js
|
|
import * as fs from 'fs';
|
|
import { ufs } from 'unionfs';
|
|
|
|
ufs.use(fs).use(vol);
|
|
|
|
ufs.readFileSync('/foo'); // bar
|
|
```
|
|
|
|
Use [`fs-monkey`][fs-monkey] to monkey-patch Node's `require` function:
|
|
|
|
```js
|
|
import { patchRequire } from 'fs-monkey';
|
|
|
|
vol.writeFileSync('/index.js', 'console.log("hi world")');
|
|
patchRequire(vol);
|
|
require('/index'); // hi world
|
|
```
|
|
|
|
## Docs
|
|
|
|
- [Reference](./docs/reference.md)
|
|
- [Relative paths](./docs/relative-paths.md)
|
|
- [API status](./docs/api-status.md)
|
|
- [Dependencies](./docs/dependencies.md)
|
|
|
|
## See also
|
|
|
|
- [`spyfs`][spyfs] - spies on filesystem actions
|
|
- [`unionfs`][unionfs] - creates a union of multiple filesystem volumes
|
|
- [`linkfs`][linkfs] - redirects filesystem paths
|
|
- [`fs-monkey`][fs-monkey] - monkey-patches Node's `fs` module and `require` function
|
|
- [`libfs`](https://github.com/streamich/full-js/blob/master/src/lib/fs.ts) - real filesystem (that executes UNIX system calls) implemented in JavaScript
|
|
|
|
[chat]: https://onp4.com/@vadim/~memfs
|
|
[chat-badge]: https://img.shields.io/badge/Chat-%F0%9F%92%AC-green?style=flat&logo=chat&link=https://onp4.com/@vadim/~memfs
|
|
[npm-url]: https://www.npmjs.com/package/memfs
|
|
[npm-badge]: https://img.shields.io/npm/v/memfs.svg
|
|
[travis-url]: https://travis-ci.org/streamich/memfs
|
|
[travis-badge]: https://travis-ci.org/streamich/memfs.svg?branch=master
|
|
[memfs]: https://github.com/streamich/memfs
|
|
[unionfs]: https://github.com/streamich/unionfs
|
|
[linkfs]: https://github.com/streamich/linkfs
|
|
[spyfs]: https://github.com/streamich/spyfs
|
|
[fs-monkey]: https://github.com/streamich/fs-monkey
|
|
|
|
## License
|
|
|
|
[Unlicense](./LICENSE) - public domain.
|