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node_modules/fs-monkey/docs/api/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' ]
+```