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unique-filename
===============
Generate a unique filename for use in temporary directories or caches.
```js
const uniqueFilename = require ( 'unique-filename' )
// returns something like: '/tmp/c5b28f47'
const randomTmpfile = uniqueFilename ( os . tmpdir ())
// returns something like: '/tmp/my-test-51a7b48d'
const randomPrefixedTmpfile = uniqueFilename ( os . tmpdir (), 'my-test' )
// returns something like: '/my-tmp-dir/testing-7ddd44c0'
const uniqueTmpfile = uniqueFilename ( '/my-tmp-dir' , 'testing' , '/my/thing/to/uniq/on' )
```
### uniqueFilename(*dir*, *fileprefix*, *uniqstr*) → String
Returns the full path of a unique filename that looks like:
`dir/prefix-7ddd44c0`
or `dir/7ddd44c0`
*dir* – `os.tmpdir()` is a good choice for this.
*fileprefix* –
The parameter is required if *uniqstr* is also passed in but is otherwise
optional and can be `undefined` /`null`/`''`. If present and not empty
then this string plus a hyphen are prepended to the unique part.
*uniqstr* –
filename will be random. If passed in it will be generated from this string
in a reproducible way.