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41 lines
938 B
Markdown
41 lines
938 B
Markdown
# `patchFs(vol[, fs])`
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Rewrites Node's filesystem module `fs` with *fs-like* object.
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- `vol` - fs-like object
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- `fs` *(optional)* - a filesystem to patch, defaults to `require('fs')`
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```js
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import {patchFs} from 'fs-monkey';
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const myfs = {
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readFileSync: () => 'hello world',
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};
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patchFs(myfs);
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console.log(require('fs').readFileSync('/foo/bar')); // hello world
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```
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You don't need to create *fs-like* objects yourself, use [`memfs`](https://github.com/streamich/memfs)
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to create a virtual filesystem for you:
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```js
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import {vol} from 'memfs';
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import {patchFs} from 'fs-monkey';
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vol.fromJSON({'/dir/foo': 'bar'});
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patchFs(vol);
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console.log(require('fs').readdirSync('/')); // [ 'dir' ]
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```
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Promises API is supported as well:
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```js
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import {vol} from 'memfs';
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import {patchFs} from 'fs-monkey';
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vol.fromJSON({'/dir/foo': 'bar'});
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patchFs(vol);
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require('fs').promises.readFile('/dir/foo', 'UTF-8').then(console.log); // bar
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```
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