143 lines
4.3 KiB
Markdown
143 lines
4.3 KiB
Markdown
# memfs
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This is a fork of https://www.npmjs.com/package/memfs, since there's a bunch of critical bugs and missing maintenance there, which might not be a priority for that project, but are definitely a priority for me (though I'm sending PR's). Upstream memfs has nearly 12 million downloads a week, so I can see why doing these changes would be really scary there!
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Things I've done here include:
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- update to newest jest, and increase maxWorkers for testing; fix an issue with one test
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- update to newest typescript and node typings
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- update target to es2020 from es5; this does make code run more efficiently and is much easier to debug if you want to directly edit node_modules
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- fix the 13 security vulnerabilities revealed by npm audit
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- upgrade prettier and switch to using the defaults
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- switch to package-lock.json instead of yarn's lock
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- fix chmodSync bug
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- fix utimesSync bug
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- fix realpathSync bug
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See https://github.com/sagemathinc/memfs-js
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---
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## Upstream description
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In-memory file-system with [Node's `fs` API](https://nodejs.org/api/fs.html).
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- 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)
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- Stores files in memory, in `Buffer`s
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- Throws sameish\* errors as Node.js
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- Has concept of _i-nodes_
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- Implements _hard links_
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- Implements _soft links_ (aka symlinks, symbolic links)
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- Permissions may\* be implemented in the future
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- Can be used in browser, see [`memfs-webpack`](https://github.com/streamich/memfs-webpack)
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### Install
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```shell
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npm install --save memfs
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```
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## Usage
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```js
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import { fs } from "memfs";
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fs.writeFileSync("/hello.txt", "World!");
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fs.readFileSync("/hello.txt", "utf8"); // World!
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```
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Create a file system from a plain JSON:
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```js
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import { fs, vol } from "memfs";
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const json = {
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"./README.md": "1",
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"./src/index.js": "2",
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"./node_modules/debug/index.js": "3",
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};
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vol.fromJSON(json, "/app");
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fs.readFileSync("/app/README.md", "utf8"); // 1
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vol.readFileSync("/app/src/index.js", "utf8"); // 2
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```
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Export to JSON:
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```js
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vol.writeFileSync("/script.sh", "sudo rm -rf *");
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vol.toJSON(); // {"/script.sh": "sudo rm -rf *"}
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```
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Use it for testing:
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```js
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vol.writeFileSync("/foo", "bar");
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expect(vol.toJSON()).toEqual({ "/foo": "bar" });
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```
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Create as many filesystem volumes as you need:
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```js
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import { Volume } from "memfs";
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const vol = Volume.fromJSON({ "/foo": "bar" });
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vol.readFileSync("/foo"); // bar
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const vol2 = Volume.fromJSON({ "/foo": "bar 2" });
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vol2.readFileSync("/foo"); // bar 2
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```
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Use `memfs` together with [`unionfs`][unionfs] to create one filesystem
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from your in-memory volumes and the real disk filesystem:
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```js
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import * as fs from "fs";
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import { ufs } from "unionfs";
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ufs.use(fs).use(vol);
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ufs.readFileSync("/foo"); // bar
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```
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Use [`fs-monkey`][fs-monkey] to monkey-patch Node's `require` function:
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```js
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import { patchRequire } from "fs-monkey";
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vol.writeFileSync("/index.js", 'console.log("hi world")');
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patchRequire(vol);
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require("/index"); // hi world
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```
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## Docs
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- [Reference](./docs/reference.md)
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- [Relative paths](./docs/relative-paths.md)
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- [API status](./docs/api-status.md)
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- [Dependencies](./docs/dependencies.md)
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## See also
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- [`spyfs`][spyfs] - spies on filesystem actions
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- [`unionfs`][unionfs] - creates a union of multiple filesystem volumes
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- [`linkfs`][linkfs] - redirects filesystem paths
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- [`fs-monkey`][fs-monkey] - monkey-patches Node's `fs` module and `require` function
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- [`libfs`](https://github.com/streamich/full-js/blob/master/src/lib/fs.ts) - real filesystem (that executes UNIX system calls) implemented in JavaScript
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[chat]: https://onp4.com/@vadim/~memfs
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[chat-badge]: https://img.shields.io/badge/Chat-%F0%9F%92%AC-green?style=flat&logo=chat&link=https://onp4.com/@vadim/~memfs
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[npm-url]: https://www.npmjs.com/package/memfs
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[npm-badge]: https://img.shields.io/npm/v/memfs.svg
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[travis-url]: https://travis-ci.org/streamich/memfs
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[travis-badge]: https://travis-ci.org/streamich/memfs.svg?branch=master
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[memfs]: https://github.com/streamich/memfs
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[unionfs]: https://github.com/streamich/unionfs
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[linkfs]: https://github.com/streamich/linkfs
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[spyfs]: https://github.com/streamich/spyfs
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[fs-monkey]: https://github.com/streamich/fs-monkey
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## License
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[Unlicense](./LICENSE) - public domain.
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