+// LazyTransform is a special type of Transform stream that is lazily loaded.
+// This is used for performance with bi-API-ship: when two APIs are available
+// for the stream, one conventional and one non-conventional.
+'use strict';
+
+const stream = require('stream');
+const util = require('util');
+
+module.exports = LazyTransform;
+
+function LazyTransform(options) {
+ this._options = options;
+}
+util.inherits(LazyTransform, stream.Transform);
+
+[
+ '_readableState',
+ '_writableState',
+ '_transformState'
+].forEach(function(prop, i, props) {
+ Object.defineProperty(LazyTransform.prototype, prop, {
+ get: function() {
+ stream.Transform.call(this, this._options);
+ this._writableState.decodeStrings = false;
+ this._writableState.defaultEncoding = 'binary';
+ return this[prop];
+ },
+ set: function(val) {
+ Object.defineProperty(this, prop, {
+ value: val,
+ enumerable: true,
+ configurable: true,
+ writable: true
+ });
+ },
+ configurable: true,
+ enumerable: true
+ });
+});