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patchFs.md
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# `patchFs(vol[, fs])` Rewrites Node's filesystem module `fs` with *fs-like* object. - `vol` - fs-like object - `fs` *(optional)* - a filesystem to patch, defaults to `require('fs')` ```js import {patchFs} from 'fs-monkey'; const myfs = { readFileSync: () => 'hello world', }; patchFs(myfs); console.log(require('fs').readFileSync('/foo/bar')); // hello world ``` You don't need to create *fs-like* objects yourself, use [`memfs`](https://github.com/streamich/memfs) to create a virtual filesystem for you: ```js import {vol} from 'memfs'; import {patchFs} from 'fs-monkey'; vol.fromJSON({'/dir/foo': 'bar'}); patchFs(vol); console.log(require('fs').readdirSync('/')); // [ 'dir' ] ```