diff --git a/lib/internal/webstreams/readablestream.js b/lib/internal/webstreams/readablestream.js
index 5344785b90cd3e..e83bd17a06d9cb 100644
--- a/lib/internal/webstreams/readablestream.js
+++ b/lib/internal/webstreams/readablestream.js
@@ -1105,16 +1105,7 @@ class ReadableByteStreamController {
   enqueue(chunk) {
     if (!isReadableByteStreamController(this))
       throw new ERR_INVALID_THIS('ReadableByteStreamController');
-    if (!isArrayBufferView(chunk)) {
-      throw new ERR_INVALID_ARG_TYPE(
-        'chunk',
-        [
-          'Buffer',
-          'TypedArray',
-          'DataView',
-        ],
-        chunk);
-    }
+    validateBuffer(chunk);
     const chunkByteLength = ArrayBufferViewGetByteLength(chunk);
     const chunkBuffer = ArrayBufferViewGetBuffer(chunk);
     const chunkBufferByteLength = ArrayBufferPrototypeGetByteLength(chunkBuffer);
diff --git a/lib/internal/webstreams/transformstream.js b/lib/internal/webstreams/transformstream.js
index 38342b41804385..6e119bde63bb2f 100644
--- a/lib/internal/webstreams/transformstream.js
+++ b/lib/internal/webstreams/transformstream.js
@@ -26,6 +26,7 @@ const {
 const {
   createDeferredPromise,
   customInspectSymbol: kInspect,
+  kEmptyObject,
   kEnumerableProperty,
 } = require('internal/util');
 
@@ -117,8 +118,8 @@ class TransformStream {
    */
   constructor(
     transformer = null,
-    writableStrategy = {},
-    readableStrategy = {}) {
+    writableStrategy = kEmptyObject,
+    readableStrategy = kEmptyObject) {
     const readableType = transformer?.readableType;
     const writableType = transformer?.writableType;
     const start = transformer?.start;
@@ -292,7 +293,7 @@ class TransformStreamDefaultController {
   }
 
   /**
-   * @param {any} chunk
+   * @param {any} [chunk]
    */
   enqueue(chunk = undefined) {
     if (!isTransformStreamDefaultController(this))
@@ -301,7 +302,7 @@ class TransformStreamDefaultController {
   }
 
   /**
-   * @param {any} reason
+   * @param {any} [reason]
    */
   error(reason = undefined) {
     if (!isTransformStreamDefaultController(this))
diff --git a/lib/internal/webstreams/writablestream.js b/lib/internal/webstreams/writablestream.js
index ba66cea7a4850d..a86843e176175b 100644
--- a/lib/internal/webstreams/writablestream.js
+++ b/lib/internal/webstreams/writablestream.js
@@ -33,6 +33,7 @@ const {
 const {
   createDeferredPromise,
   customInspectSymbol: kInspect,
+  kEmptyObject,
   kEnumerableProperty,
 } = require('internal/util');
 
@@ -133,7 +134,7 @@ class WritableStream {
    * @param {UnderlyingSink} [sink]
    * @param {QueuingStrategy} [strategy]
    */
-  constructor(sink = null, strategy = {}) {
+  constructor(sink = null, strategy = kEmptyObject) {
     const type = sink?.type;
     if (type !== undefined)
       throw new ERR_INVALID_ARG_VALUE.RangeError('type', type);
@@ -202,7 +203,7 @@ class WritableStream {
   }
 
   /**
-   * @param {any} reason
+   * @param {any} [reason]
    * @returns {Promise<void>}
    */
   abort(reason = undefined) {
@@ -460,7 +461,7 @@ class WritableStreamDefaultWriter {
   }
 
   /**
-   * @param {any} chunk
+   * @param {any} [chunk]
    * @returns {Promise<void>}
    */
   write(chunk = undefined) {