1// Copyright Joyent, Inc. and other Node contributors. 2// 3// Permission is hereby granted, free of charge, to any person obtaining a 4// copy of this software and associated documentation files (the 5// "Software"), to deal in the Software without restriction, including 6// without limitation the rights to use, copy, modify, merge, publish, 7// distribute, sublicense, and/or sell copies of the Software, and to permit 8// persons to whom the Software is furnished to do so, subject to the 9// following conditions: 10// 11// The above copyright notice and this permission notice shall be included 12// in all copies or substantial portions of the Software. 13// 14// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 15// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 16// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN 17// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 18// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 19// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 20// USE OR OTHER DEALINGS IN THE SOFTWARE. 21 22// a passthrough stream. 23// basically just the most minimal sort of Transform stream. 24// Every written chunk gets output as-is. 25 26'use strict'; 27 28const { 29 ObjectSetPrototypeOf, 30} = primordials; 31 32module.exports = PassThrough; 33 34const Transform = require('internal/streams/transform'); 35ObjectSetPrototypeOf(PassThrough.prototype, Transform.prototype); 36ObjectSetPrototypeOf(PassThrough, Transform); 37 38function PassThrough(options) { 39 if (!(this instanceof PassThrough)) 40 return new PassThrough(options); 41 42 Transform.call(this, options); 43} 44 45PassThrough.prototype._transform = function(chunk, encoding, cb) { 46 cb(null, chunk); 47}; 48