Streams3, a user-land copy of the stream library from Node.js. 

Node.js Streams, a user-land copy of the stream library from Node.js

matteo.collina

cwmma

nodejs-foundation

readable-stream

Streams3, a user-land copy of the stream library from Node.js

rvagg

tootallnate

isaacs

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// Copyright Joyent, Inc. and other Node contributors.

// Permission is hereby granted, free of charge, to any person obtaining a

// copy of this software and associated documentation files (the

// "Software"), to deal in the Software without restriction, including

// without limitation the rights to use, copy, modify, merge, publish,

// distribute, sublicense, and/or sell copies of the Software, and to permit

// persons to whom the Software is furnished to do so, subject to the

// The above copyright notice and this permission notice shall be included

// in all copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN

// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,

// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR

// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE

// USE OR OTHER DEALINGS IN THE SOFTWARE.

var pna = require('process-nextick-args');

var EElistenerCount = function (emitter, type) {

var Stream = require('./internal/streams/stream');

var OurUint8Array = global.Uint8Array || function () {};

  return Buffer.isBuffer(obj) || obj instanceof OurUint8Array;

var BufferList = require('./internal/streams/buffer_list');

var destroyImpl = require('./internal/streams/destroy');

var _require = require('./internal/streams/state'),

    getHighWaterMark = _require.getHighWaterMark;

var _require$codes = require('../errors').codes,

    ERR_INVALID_ARG_TYPE = _require$codes.ERR_INVALID_ARG_TYPE,

    ERR_STREAM_PUSH_AFTER_EOF = _require$codes.ERR_STREAM_PUSH_AFTER_EOF,

    ERR_METHOD_NOT_IMPLEMENTED = _require$codes.ERR_METHOD_NOT_IMPLEMENTED,

    ERR_STREAM_UNSHIFT_AFTER_END_EVENT = _require$codes.ERR_STREAM_UNSHIFT_AFTER_END_EVENT;

var _require2 = require('../experimentalWarning'),

    emitExperimentalWarning = _require2.emitExperimentalWarning;

// Lazy loaded to improve the startup performance.

var kProxyEvents = ['error', 'close', 'destroy', 'pause', 'resume'];

function prependListener(emitter, event, fn) {

  // Sadly this is not cacheable as some libraries bundle their own

  // event emitter implementation with them.

  if (typeof emitter.prependListener === 'function') return emitter.prependListener(event, fn);

  // This is a hack to make sure that our error handler is attached before any

  // userland ones.  NEVER DO THIS. This is here only because this code needs

  // to continue to work with older versions of Node.js that do not include

  return function pipeOnDrainFunctionResult() {

    debug('pipeOnDrain', state.awaitDrain);

    if (state.awaitDrain) state.awaitDrain--;

    if (state.awaitDrain === 0 && EElistenerCount(src, 'data')) {

Readable.prototype.unpipe = function (dest) {

  var unpipeInfo = { hasUnpiped: false };

  // if we're not piping anywhere, then do nothing.

  if (state.pipesCount === 0) return this;

  // just one destination.  most common case.

    // passed in one, but it's not the right one.

    if (dest && dest !== state.pipes) return this;

    if (dest) dest.emit('unpipe', this, unpipeInfo);

  // slow case. multiple pipe destinations.

      dests[i].emit('unpipe', this, { hasUnpiped: false });

  var index = indexOf(state.pipes, dest);

  if (state.pipesCount === 1) state.pipes = state.pipes[0];

// set up data events if they are asked for

// Ensure readable listeners eventually get something

Readable.prototype.on = function (ev, fn) {

  var res = Stream.prototype.on.call(this, ev, fn);

    // update readableListening so that resume() may be a no-op

    // a few lines down. This is needed to support once('readable').

    state.readableListening = this.listenerCount('readable') > 0;

    // Try start flowing on next tick if stream isn't explicitly paused

    if (state.flowing !== false) this.resume();

    if (!state.endEmitted && !state.readableListening) {

      state.readableListening = state.needReadable = true;

        pna.nextTick(nReadingNextTick, this);

Readable.prototype.addListener = Readable.prototype.on;

Readable.prototype.removeListener = function (ev, fn) {

  var res = Stream.prototype.removeListener.call(this, ev, fn);

    // We need to check if there is someone still listening to

    // readable and reset the state. However this needs to happen

    // after readable has been emitted but before I/O (nextTick) to

    // support once('readable', fn) cycles. This means that calling

    // resume within the same tick will have no

    pna.nextTick(updateReadableListening, this);

    if (this[i] === undefined && typeof stream[i] === 'function') {

      this[i] = function methodWrap(method) {

        return function methodWrapReturnFunction() {

          return stream[method].apply(stream, arguments);

  for (var n = 0; n < kProxyEvents.length; n++) {

    stream.on(kProxyEvents[n], this.emit.bind(this, kProxyEvents[n]));

  // when we try to consume some more bytes, simply unpause the

Readable.prototype[Symbol.asyncIterator] = function () {

  emitExperimentalWarning('Readable[Symbol.asyncIterator]');

  if (ReadableAsyncIterator === undefined) ReadableAsyncIterator = require('./internal/streams/async_iterator');

		@@ -698,3 +698,3 @@ // Copyright Joyent, Inc. and other Node contributors.
		function pipeOnDrain(src) {
		return function () {
		return function pipeOnDrainFunctionResult() {
		var state = src._readableState;
		@@ -916,4 +916,4 @@ debug('pipeOnDrain', state.awaitDrain);
		if (this[i] === undefined && typeof stream[i] === 'function') {
		this[i] = function (method) {
		return function () {
		this[i] = function methodWrap(method) {
		return function methodWrapReturnFunction() {
		return stream[method].apply(stream, arguments);
		@@ -920,0 +920,0 @@ };

		@@ -224,3 +224,3 @@ // Copyright Joyent, Inc. and other Node contributors.
		Object.defineProperty(WritableState.prototype, 'buffer', {
		get: internalUtil.deprecate(function () {
		get: internalUtil.deprecate(function writableStateBufferGetter() {
		return this.getBuffer();
		@@ -227,0 +227,0 @@ }, '_writableState.buffer is deprecated. Use _writableState.getBuffer ' + 'instead.', 'DEP0003')

		{
		"name": "readable-stream",
		"version": "3.0.0-rc.2",
		"version": "3.0.0-rc.3",
		"description": "Streams3, a user-land copy of the stream library from Node.js",
		@@ -5,0 +5,0 @@ "main": "readable.js",

		@@ -18,3 +18,3 @@ # readable-stream

		Full documentation may be found on the [Node.js website](https://nodejs.org/dist/v10.6.0/docs/api/stream.html).
		Full documentation may be found on the [Node.js website](https://nodejs.org/dist/v10.8.0/docs/api/stream.html).

		@@ -21,0 +21,0 @@ If you want to guarantee a stable streams base, regardless of what version of

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