From 83c884b4b7338b34e8fe176ce27b4f55b4c0d929 Mon Sep 17 00:00:00 2001
From: LiviaMedeiros <livia@cirno.name>
Date: Sat, 21 May 2022 17:55:42 +0800
Subject: [PATCH] stream: use `kEmptyObject`

PR-URL: https://github.com/nodejs/node/pull/43159
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
---
 lib/internal/streams/end-of-stream.js     |  9 ++++++---
 lib/internal/webstreams/adapters.js       |  9 +++++----
 lib/internal/webstreams/encoding.js       |  3 ++-
 lib/internal/webstreams/readablestream.js | 11 ++++++-----
 4 files changed, 19 insertions(+), 13 deletions(-)

diff --git a/lib/internal/streams/end-of-stream.js b/lib/internal/streams/end-of-stream.js
index 9edd6cc9def..db407fb251c 100644
--- a/lib/internal/streams/end-of-stream.js
+++ b/lib/internal/streams/end-of-stream.js
@@ -10,7 +10,10 @@ const {
 const {
   ERR_STREAM_PREMATURE_CLOSE
 } = codes;
-const { once } = require('internal/util');
+const {
+  kEmptyObject,
+  once,
+} = require('internal/util');
 const {
   validateAbortSignal,
   validateFunction,
@@ -64,9 +67,9 @@ function isReadableEnded(stream) {
 function eos(stream, options, callback) {
   if (arguments.length === 2) {
     callback = options;
-    options = {};
+    options = kEmptyObject;
   } else if (options == null) {
-    options = {};
+    options = kEmptyObject;
   } else {
     validateObject(options, 'options');
   }
diff --git a/lib/internal/webstreams/adapters.js b/lib/internal/webstreams/adapters.js
index 1058c1c0356..0fd571bfe11 100644
--- a/lib/internal/webstreams/adapters.js
+++ b/lib/internal/webstreams/adapters.js
@@ -55,6 +55,7 @@ const {
 
 const {
   createDeferredPromise,
+  kEmptyObject,
 } = require('internal/util');
 
 const {
@@ -198,7 +199,7 @@ function newWritableStreamFromStreamWritable(streamWritable) {
  * }} [options]
  * @returns {Writable}
  */
-function newStreamWritableFromWritableStream(writableStream, options = {}) {
+function newStreamWritableFromWritableStream(writableStream, options = kEmptyObject) {
   if (!isWritableStream(writableStream)) {
     throw new ERR_INVALID_ARG_TYPE(
       'writableStream',
@@ -441,7 +442,7 @@ function newReadableStreamFromStreamReadable(streamReadable) {
  * }} [options]
  * @returns {Readable}
  */
-function newStreamReadableFromReadableStream(readableStream, options = {}) {
+function newStreamReadableFromReadableStream(readableStream, options = kEmptyObject) {
   if (!isReadableStream(readableStream)) {
     throw new ERR_INVALID_ARG_TYPE(
       'readableStream',
@@ -585,7 +586,7 @@ function newReadableWritablePairFromDuplex(duplex) {
  * }} [options]
  * @returns {Duplex}
  */
-function newStreamDuplexFromReadableWritablePair(pair = {}, options = {}) {
+function newStreamDuplexFromReadableWritablePair(pair = kEmptyObject, options = kEmptyObject) {
   validateObject(pair, 'pair');
   const {
     readable: readableStream,
@@ -876,7 +877,7 @@ function newWritableStreamFromStreamBase(streamBase, strategy) {
  * @param {QueuingStrategy} strategy
  * @returns {ReadableStream}
  */
-function newReadableStreamFromStreamBase(streamBase, strategy, options = {}) {
+function newReadableStreamFromStreamBase(streamBase, strategy, options = kEmptyObject) {
   validateObject(streamBase, 'streamBase');
   validateObject(options, 'options');
 
diff --git a/lib/internal/webstreams/encoding.js b/lib/internal/webstreams/encoding.js
index 9cc76fae2ce..233a09a216d 100644
--- a/lib/internal/webstreams/encoding.js
+++ b/lib/internal/webstreams/encoding.js
@@ -24,6 +24,7 @@ const {
 
 const {
   customInspectSymbol: kInspect,
+  kEmptyObject,
   kEnumerableProperty,
 } = require('internal/util');
 
@@ -114,7 +115,7 @@ class TextDecoderStream {
    *   ignoreBOM? : boolean,
    * }} [options]
    */
-  constructor(encoding = 'utf-8', options = {}) {
+  constructor(encoding = 'utf-8', options = kEmptyObject) {
     this[kType] = 'TextDecoderStream';
     this[kHandle] = new TextDecoder(encoding, options);
     this[kTransform] = new TransformStream({
diff --git a/lib/internal/webstreams/readablestream.js b/lib/internal/webstreams/readablestream.js
index bea1084bdd7..e49aa5c358b 100644
--- a/lib/internal/webstreams/readablestream.js
+++ b/lib/internal/webstreams/readablestream.js
@@ -50,6 +50,7 @@ const {
 const {
   createDeferredPromise,
   customInspectSymbol: kInspect,
+  kEmptyObject,
   kEnumerableProperty,
 } = require('internal/util');
 
@@ -206,7 +207,7 @@ class ReadableStream {
    * @param {UnderlyingSource} [source]
    * @param {QueuingStrategy} [strategy]
    */
-  constructor(source = {}, strategy = {}) {
+  constructor(source = {}, strategy = kEmptyObject) {
     if (source === null)
       throw new ERR_INVALID_ARG_VALUE('source', 'Object', source);
     this[kState] = {
@@ -296,7 +297,7 @@ class ReadableStream {
    * }} [options]
    * @returns {ReadableStreamReader}
    */
-  getReader(options = {}) {
+  getReader(options = kEmptyObject) {
     if (!isReadableStream(this))
       throw new ERR_INVALID_THIS('ReadableStream');
     validateObject(options, 'options', { nullable: true, allowFunction: true });
@@ -315,7 +316,7 @@ class ReadableStream {
    * @param {StreamPipeOptions} [options]
    * @returns {ReadableStream}
    */
-  pipeThrough(transform, options = {}) {
+  pipeThrough(transform, options = kEmptyObject) {
     if (!isReadableStream(this))
       throw new ERR_INVALID_THIS('ReadableStream');
     const readable = transform?.readable;
@@ -365,7 +366,7 @@ class ReadableStream {
    * @param {StreamPipeOptions} [options]
    * @returns {Promise<void>}
    */
-  pipeTo(destination, options = {}) {
+  pipeTo(destination, options = kEmptyObject) {
     try {
       if (!isReadableStream(this))
         throw new ERR_INVALID_THIS('ReadableStream');
@@ -416,7 +417,7 @@ class ReadableStream {
    * }} [options]
    * @returns {AsyncIterable}
    */
-  values(options = {}) {
+  values(options = kEmptyObject) {
     if (!isReadableStream(this))
       throw new ERR_INVALID_THIS('ReadableStream');
     validateObject(options, 'options');