CasperSecurity
# fs-write-stream-atomic
Like `fs.createWriteStream(...)`, but atomic.
Writes to a tmp file and does an atomic `fs.rename` to move it into
place when it's done.
First rule of debugging: **It's always a race condition.**
## USAGE
```javascript
var fsWriteStreamAtomic = require('fs-write-stream-atomic')
// options are optional.
var write = fsWriteStreamAtomic('output.txt', options)
var read = fs.createReadStream('input.txt')
read.pipe(write)
// When the write stream emits a 'finish' or 'close' event,
// you can be sure that it is moved into place, and contains
// all the bytes that were written to it, even if something else
// was writing to `output.txt` at the same time.
```
### `fsWriteStreamAtomic(filename, [options])`
* `filename` {String} The file we want to write to
* `options` {Object}
* `chown` {Object} User and group to set ownership after write
* `uid` {Number}
* `gid` {Number}
* `encoding` {String} default = 'utf8'
* `mode` {Number} default = `0666`
* `flags` {String} default = `'w'`