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# last-line-stream
> A PassThrough stream that keeps track of last line written.
[](https://travis-ci.org/jamestalmage/last-line-stream) [](https://coveralls.io/github/jamestalmage/last-line-stream?branch=master)
## Install
```
$ npm install --save last-line-stream
```
## Usage
```js
const lastLineStream = require('last-line-stream');
const stream = lastLineStream();
stream.write('foo');
assert(stream.lastLine === 'foo');
stream.write('bar');
assert(stream.lastLine === 'foobar');
stream.write('baz\nquz');
assert(stream.lastLine === 'quz');
```
## API
### lastLineStream([pipeTo])
Returns a new instance of the spying PassThrough stream,
#### pipeTo
Type: `stream`
If supplied, the new instance will automatically be piped to this stream.
### stream.lastLine
Type: `string`
The last line written out to this stream. The `lastLine` value will grow until the stream sees a newline character (`'\n'`).
## Low Level API
A low-level non-stream based API is available. It has only two methods.
```js
var createTracker = require('last-line-stream/tracker');
var tracker = createTracker();
// append some text.
tracker.update(someString);
// Find the complete last line of all the text appended.
tracker.lastLine();
```
## License
MIT © [James Talmage](http://github.com/jamestalmage)
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