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const Transform = require('stream').Transform || require('readable-stream/transform')
, inherits = require('util').inherits
, xtend = require('xtend')
function noop (chunk, enc, callback) {
callback(null, chunk)
}
function ctor (options, transform, flush) {
if (typeof options == 'function') {
flush = transform
transform = options
options = {}
}
if (typeof transform != 'function')
transform = noop
function Through2 (override) {
if (!(this instanceof Through2))
return new Through2(override)
this.options = xtend(options, override)
Transform.call(this, this.options)
}
inherits(Through2, Transform)
Through2.prototype._transform = transform
if (typeof flush == 'function')
Through2.prototype._flush = flush
return Through2
}
function make (options, transform, flush) {
return ctor(options, transform, flush)()
}
module.exports = make
module.exports.ctor = ctor
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