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fs-monkey

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fs-monkey

Monkey patches for file system related things.

  • 1.0.6
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What is fs-monkey?

The fs-monkey package is a utility library for Node.js that allows you to patch or virtualize the Node.js file system (fs) module. This can be particularly useful for testing purposes, where you might want to avoid performing I/O operations on the actual file system. It provides functionalities to patch the global fs module, or to create a virtual file system that can be used independently.

What are fs-monkey's main functionalities?

Patching the global fs module

This feature allows you to patch the global fs module with a virtual file system. In the code sample, a virtual file system is created with a single file '/foo.txt' containing the text 'bar'. The global fs module is then patched, so any subsequent fs operations in the process will interact with this virtual file system instead of the real one.

const {patchFs} = require('fs-monkey');
const {Volume} = require('memfs');
const vol = Volume.fromJSON({'/foo.txt': 'bar'});
patchFs(vol);

Creating a union file system

This feature allows you to create a union file system, which combines multiple file systems into a single coherent file system interface. In the code sample, a virtual file system is created and then combined with the real fs module using the union file system. This allows for fallback to the real file system for files not found in the virtual file system.

const {ufs} = require('fs-monkey');
const {Volume} = require('memfs');
const vol = Volume.fromJSON({'/foo.txt': 'bar'});
ufs.use(vol);
ufs.use(require('fs'));

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Package last updated on 01 May 2024

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