You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
79 lines
1.8 KiB
Markdown
79 lines
1.8 KiB
Markdown
7 months ago
|
# merge-stream
|
||
|
|
|
||
|
|
Merge (interleave) a bunch of streams.
|
||
|
|
|
||
|
|
[](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
|