merge2

merge2

Merge multiple streams into one stream in sequence or parallel.

Install

Install with npm

npm install merge2

Usage

const gulp = require('gulp') const merge2 = require('merge2') const concat = require('gulp-concat') const minifyHtml = require('gulp-minify-html') const ngtemplate = require('gulp-ngtemplate') gulp.task('app-js', function () { return merge2( gulp.src('static/src/tpl/*.html') .pipe(minifyHtml({empty: true})) .pipe(ngtemplate({ module: 'genTemplates', standalone: true }) ), gulp.src([ 'static/src/js/app.js', 'static/src/js/locale_zh-cn.js', 'static/src/js/router.js', 'static/src/js/tools.js', 'static/src/js/services.js', 'static/src/js/filters.js', 'static/src/js/directives.js', 'static/src/js/controllers.js' ]) ) .pipe(concat('app.js')) .pipe(gulp.dest('static/dist/js/')) }) const stream = merge2([stream1, stream2], stream3, {end: false}) //... stream.add(stream4, stream5) //.. stream.end() // equal to merge2([stream1, stream2], stream3) const stream = merge2() stream.add([stream1, stream2]) stream.add(stream3) // merge order: // 1. merge `stream1`; // 2. merge `stream2` and `stream3` in parallel after `stream1` merged; // 3. merge 'stream4' after `stream2` and `stream3` merged; const stream = merge2(stream1, [stream2, stream3], stream4) // merge order: // 1. merge `stream5` and `stream6` in parallel after `stream4` merged; // 2. merge 'stream7' after `stream5` and `stream6` merged; stream.add([stream5, stream6], stream7) // nest merge // equal to merge2(stream1, stream2, stream6, stream3, [stream4, stream5]); const streamA = merge2(stream1, stream2) const streamB = merge2(stream3, [stream4, stream5]) const stream = merge2(streamA, streamB) streamA.add(stream6)

API

const merge2 = require('merge2')

merge2()

merge2(options)

merge2(stream1, stream2, ..., streamN)

merge2(stream1, stream2, ..., streamN, options)

merge2(stream1, [stream2, stream3, ...], streamN, options)

return a duplex stream (mergedStream). streams in array will be merged in parallel.

mergedStream.add(stream)

mergedStream.add(stream1, [stream2, stream3, ...], ...)

return the mergedStream.

mergedStream.on('queueDrain', function() {})

It will emit 'queueDrain' when all streams merged. If you set end === false in options, this event give you a notice that should add more streams to merge or end the mergedStream.

stream

option Type: Readable or Duplex or Transform stream.

options

option Type: Object.

• end - Boolean - if end === false then mergedStream will not be auto ended, you should end by yourself. Default: undefined

• pipeError - Boolean - if pipeError === true then mergedStream will emit error event from source streams. Default: undefined

• objectMode - Boolean . Default: true

objectMode and other options(highWaterMark, defaultEncoding ...) is same as Node.js Stream.

License

MIT © Teambition