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# merge-stream

Merge (interleave) a bunch of streams.

[![build status](https://secure.travis-ci.org/grncdr/merge-stream.svg?branch=master)](http://travis-ci.org/grncdr/merge-stream)

## Synopsis

```javascript
var stream1 = new Stream();
var stream2 = new Stream();

var merged = mergeStream(stream1, stream2);

var stream3 = new Stream();
merged.add(stream3);
merged.isEmpty();
//=> false
```

## Description

This is adapted from [event-stream](https://github.com/dominictarr/event-stream) separated into a new module, using Streams3.

## API

### `mergeStream`

Type: `function`

Merges an arbitrary number of streams. Returns a merged stream.

#### `merged.add`

A method to dynamically add more sources to the stream. The argument supplied to `add` can be either a source or an array of sources.

#### `merged.isEmpty`

A method that tells you if the merged stream is empty.

When a stream is "empty" (aka. no sources were added), it could not be returned to a gulp task.

So, we could do something like this:

```js
stream = require('merge-stream')();
// Something like a loop to add some streams to the merge stream
// stream.add(streamA);
// stream.add(streamB);
return stream.isEmpty() ? null : stream;
```

## Gulp example

An example use case for **merge-stream** is to combine parts of a task in a project's **gulpfile.js** like this:

```js
const gulp =          require('gulp');
const htmlValidator = require('gulp-w3c-html-validator');
const jsHint =        require('gulp-jshint');
const mergeStream =   require('merge-stream');

function lint() {
  return mergeStream(
    gulp.src('src/*.html')
      .pipe(htmlValidator())
      .pipe(htmlValidator.reporter()),
    gulp.src('src/*.js')
      .pipe(jsHint())
      .pipe(jsHint.reporter())
  );
}
gulp.task('lint', lint);
```

## License

MIT