memfs | In-memory filesystem with Node's API | Runtime Evironment library
kandi X-RAY | memfs Summary
kandi X-RAY | memfs Summary
In-memory file-system with Node's fs API.
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memfs Examples and Code Snippets
Lines of Code : 40License : Strong Copyleft (CC BY-SA 4.0)
Copy// tests/index.test.ts
import fs from "fs";
import memfs from "memfs";
import "graceful-fs"; // comment this and the test should pass.
jest.mock("fs");
jest.mock("fs/promises");
test("should mock fs", () => {
expect(fs).toBe(memfconst config = {
output: {
path: path.join(__dirname, 'public'),
filename: '[contenthash].js',
assetModuleFilename: '[contenthash].[ext]',
publicPath: '/',
libraryTarget: 'umd',
clean: false,
},
target: 'web',Community Discussions
Trending Discussions on memfs
QUESTION
I have a embed.FS, like:
ANSWER
Answered 2022-Apr-02 at 13:32embed.FS is a specific implementation for reading files embedded in the binary - it can't be used for filesystems built at runtime.
There are some fs.FS implementations in the standard library that may work for your use case. You could process your files into:
- A temporary filesystem directory and pass to
os.DirFS. - An in-memory ZIP file and use
archive/zip.Readeras anfs.FS. testing/fstest.MapFS. This is really intended for testing, but it is there..
Personally, I'd would either:
- Minify via
go generatebefore building the binary and usingembed.FS. This could provide a smaller binary with less startup time/memory usage. - Write my own
fs.FSor pull in a dependency if the files need to be modified at runtime. It's not much code.
QUESTION
Using go-git/v5 and trying to clone over https as follows:
ANSWER
Answered 2021-Dec-04 at 14:16This should work:
QUESTION
While writing jest tests, I needed to use memfs as a mock for the Nodejs native file system module, so I used jest's manual mocks, but I'm getting this error:
...ANSWER
Answered 2021-Sep-04 at 00:17I was able to narrow the source of the problem down to a dependency.
It seems like memfs is not compatible with graceful-fs which is a dependency of fs-extra which in turn is a dependency of a library I'm using in my own code (laravel-mix). So here's a very minimal reproduction of the error now:
QUESTION
I am packaging the data for my WebAssembly game using emcc --preload-file command, which puts it into MEMFS and keeps it in RAM until the webpage is closed.
The game typically opens a file, reads it's contents, closes it, and never touches the file again, it is not using mmap.
Would it be more memory efficient to download all game data into IndexedDB / Emscripten IDBFS on first launch? Does the web browser load the whole IndexedDB into RAM, does it free up RAM after the file in IDBFS was closed?
My target hardware is Safari on iPhone XS with 2GB RAM, and the game data is around 60 MB.
...ANSWER
Answered 2021-Jun-01 at 22:01As you mentioned, MEMFS is an in-memory "filesystem" and it works in any browser. IndexedDB is a proper database and it's optimal use-case is for storing large amounts of data (more than what can fit in RAM).
Often times when an app or website is loaded for the first time there's a lot of API calls, authentication, and other work that needs to be done. Doing this every time the application opens up is not optimal so IndexedDB can be used as a way to speed up repeated visits. This way, the latest app state could be stored in IndexedDB and the app can then sync in the background (see stale-while-revalidate).
If you think your game could benefit from this, then you could consider using it. If you think you could also do this would MEMFS, however, I would recommend that since IndexedDB has some nuances.
In the specific case of safari on IOS, you can't store blobs in IndexedDB. You can, however, convert the blob into an ArrayBuffer but you'll also have to store the MIME type alongside the buffer in order to do the conversion correctly (since ArrayBuffer doesn't have a MIME type but blob does).
Writing to storage in IndexedDB may also fail. This could happen for a variety of reasons. Maybe the user is using private mode, or maybe they don't have enough disk space.
If the user clears their cache on their phone, the IndexedDB data may be cleared as well. You may need to handle this.
I've run into some of these errors in the past using IndexedDB and it can be a headache. I would recommend Memfs.
As for the implementation details of IDBFS, it may or may not remain constant across browsers and platforms. What I can say for sure, however, is that unless you are saving a lot of data that needs to be computed in your first application, try profiling memfs and if it works well enough, then you can stick with it.
QUESTION
I have been reading the makefile of xv6 project. I want to put all the user programs into a folder to keep the project tidy. I can not find where it compiles the user programs. I know that when i run: make fs.img; it will compile the user programs, but i can not find any commands to do so. I also want all the kernel code to go into a directory called "kernel".
Is there a feature in make that allows automatic compilation or is there just something I'm not seeing. And could anyone suggest any make docs to help me understand this makefile.
My Makefile:
...ANSWER
Answered 2021-Mar-25 at 12:30All make systems (as required by POSIX) have a number of built-in rules including rules that know how to compile object files from C files.
For information on GNU make's built-in rules you can review the manual.
QUESTION
I am trying to run the command npm run dev or npm run production. But none of them are successful. Once I run the command I am getting an error like in image :
error after running npm run prod
My package.json file is like below :
...ANSWER
Answered 2021-Jan-31 at 07:24Laravel Mix 6 removes a number of options from the CLI. You will need to update the scripts section of your package.json file accordingly.
See Update Your NPM Scripts
https://laravel-mix.com/docs/6.0/upgrade#update-your-npm-scripts
Before:
QUESTION
For some reason I cant iterate with range
...ANSWER
Answered 2020-Dec-24 at 15:16What I see is that your saving logic is faulty, and I suspect you aren’t able to iterate the map because it is in fact empty.
Here
QUESTION
I have an HTML input like this .
I want to load the file into Emscripten's MEMFS file system.
Looking at the Emscripten file API I have been trying to use FS.mount() to do so.
However, the documentation only gives an example of using mount using WORKERFS, so I tried playing around with it like this.
...ANSWER
Answered 2020-May-03 at 19:22Here is what I ended up doing–
input_test.html for file input:
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