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'use strict'; const { PassThrough } = require('stream'); module.exports = function (/*streams...*/) { var sources = [] var output = new PassThrough({objectMode: true}) output.setMaxListeners(0) output.add = add output.isEmpty = isEmpty output.on('unpipe', remove) Array.prototype.slice.call(arguments).forEach(add) return output function add (source) { if (Array.isArray(source)) { source.forEach(add) return this } sources.push(source); source.once('end', remove.bind(null, source)) source.once('error', output.emit.bind(output, 'error')) source.pipe(output, {end: false}) return this } function isEmpty () { return sources.length == 0; } function remove (source) { sources = sources.filter(function (it) { return it !== source }) if (!sources.length && output.readable) { output.end() } } }