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var iterate = require('stream-iterate') var from = require('from2') var defaultKey = function (val) { return val.key || val } var union = function (streamA, streamB, toKey) { var readA = iterate(streamA) var readB = iterate(streamB) if (!toKey) toKey = defaultKey var stream = from.obj(function loop (size, cb) { readA(function (err, dataA, nextA) { if (err) return cb(err) readB(function (err, dataB, nextB) { if (err) return cb(err) if (!dataA && !dataB) return cb(null, null) if (!dataA) { nextB() return cb(null, dataB) } if (!dataB) { nextA() return cb(null, dataA) } var keyA = toKey(dataA) var keyB = toKey(dataB) if (keyA === keyB) { nextB() return loop(size, cb) } if (keyA < keyB) { nextA() return cb(null, dataA) } nextB() cb(null, dataB) }) }) }) stream.on('close', function () { if (streamA.destroy) streamA.destroy() if (streamB.destroy) streamB.destroy() }) return stream } module.exports = union
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