stream: fix web streams have no Symbol.toStringTag

stream: fix web streams have no Symbol.toStringTag

stream: add unit tests

lib/internal/webstreams/queuingstrategies.js

@@ -56,14 +56,20 @@ const byteSizeFunction = ObjectDefineProperty(
 );
 const countSizeFunction = ObjectDefineProperty(() => 1, 'name', nameDescriptor);
 
+const getNonWritablePropertyDescriptor = (value) => {
+  return {
+    __proto__: null,
+    configurable: true,
+    value,
+  };
+};
+
 /**
  * @type {QueuingStrategy}
  */
 class ByteLengthQueuingStrategy {
   [kType] = 'ByteLengthQueuingStrategy';
 
-  get [SymbolToStringTag]() { return this[kType]; }
-
   /**
    * @param {{
    *   highWaterMark : number
@@ -110,6 +116,7 @@ class ByteLengthQueuingStrategy {
 ObjectDefineProperties(ByteLengthQueuingStrategy.prototype, {
   highWaterMark: kEnumerableProperty,
   size: kEnumerableProperty,
+  [SymbolToStringTag]: getNonWritablePropertyDescriptor(ByteLengthQueuingStrategy.name)
 });
 
 /**
@@ -118,8 +125,6 @@ ObjectDefineProperties(ByteLengthQueuingStrategy.prototype, {
 class CountQueuingStrategy {
   [kType] = 'CountQueuingStrategy';
 
-  get [SymbolToStringTag]() { return this[kType]; }
-
   /**
    * @param {{
    *   highWaterMark : number
@@ -166,6 +171,7 @@ class CountQueuingStrategy {
 ObjectDefineProperties(CountQueuingStrategy.prototype, {
   highWaterMark: kEnumerableProperty,
   size: kEnumerableProperty,
+  [SymbolToStringTag]: getNonWritablePropertyDescriptor(CountQueuingStrategy.name)
 });
 
 module.exports = {

lib/internal/webstreams/readablestream.js

@@ -141,6 +141,14 @@ const kError = Symbol('kError');
 const kPull = Symbol('kPull');
 const kRelease = Symbol('kRelease');
 
+const getNonWritablePropertyDescriptor = (value) => {
+  return {
+    __proto__: null,
+    configurable: true,
+    value,
+  };
+};
+
 /**
  * @typedef {import('../abort_controller').AbortSignal} AbortSignal
  * @typedef {import('./queuingstrategies').QueuingStrategy} QueuingStrategy
@@ -206,8 +214,6 @@ const kRelease = Symbol('kRelease');
 class ReadableStream {
   [kType] = 'ReadableStream';
 
-  get [SymbolToStringTag]() { return this[kType]; }
-
   /**
    * @param {UnderlyingSource} [source]
    * @param {QueuingStrategy} [strategy]
@@ -604,6 +610,7 @@ ObjectDefineProperties(ReadableStream.prototype, {
   pipeThrough: kEnumerableProperty,
   pipeTo: kEnumerableProperty,
   tee: kEnumerableProperty,
+  [SymbolToStringTag]: getNonWritablePropertyDescriptor(ReadableStream.name)
 });
 
 function TransferredReadableStream() {
@@ -629,8 +636,6 @@ TransferredReadableStream.prototype[kDeserialize] = () => {};
 class ReadableStreamBYOBRequest {
   [kType] = 'ReadableStreamBYOBRequest';
 
-  get [SymbolToStringTag]() { return this[kType]; }
-
   constructor() {
     throw new ERR_ILLEGAL_CONSTRUCTOR();
   }
@@ -710,6 +715,7 @@ ObjectDefineProperties(ReadableStreamBYOBRequest.prototype, {
   view: kEnumerableProperty,
   respond: kEnumerableProperty,
   respondWithNewView: kEnumerableProperty,
+  [SymbolToStringTag]: getNonWritablePropertyDescriptor(ReadableStreamBYOBRequest.name)
 });
 
 function createReadableStreamBYOBRequest(controller, view) {
@@ -769,8 +775,6 @@ class ReadIntoRequest {
 class ReadableStreamDefaultReader {
   [kType] = 'ReadableStreamDefaultReader';
 
-  get [SymbolToStringTag]() { return this[kType]; }
-
   /**
    * @param {ReadableStream} stream
    */
@@ -854,13 +858,12 @@ ObjectDefineProperties(ReadableStreamDefaultReader.prototype, {
   read: kEnumerableProperty,
   releaseLock: kEnumerableProperty,
   cancel: kEnumerableProperty,
+  [SymbolToStringTag]: getNonWritablePropertyDescriptor(ReadableStreamDefaultReader.name)
 });
 
 class ReadableStreamBYOBReader {
   [kType] = 'ReadableStreamBYOBReader';
 
-  get [SymbolToStringTag]() { return this[kType]; }
-
   /**
    * @param {ReadableStream} stream
    */
@@ -971,13 +974,12 @@ ObjectDefineProperties(ReadableStreamBYOBReader.prototype, {
   read: kEnumerableProperty,
   releaseLock: kEnumerableProperty,
   cancel: kEnumerableProperty,
+  [SymbolToStringTag]: getNonWritablePropertyDescriptor(ReadableStreamBYOBReader.name)
 });
 
 class ReadableStreamDefaultController {
   [kType] = 'ReadableStreamDefaultController';
 
-  get [SymbolToStringTag]() { return this[kType]; }
-
   constructor() {
     throw new ERR_ILLEGAL_CONSTRUCTOR();
   }
@@ -1032,6 +1034,7 @@ ObjectDefineProperties(ReadableStreamDefaultController.prototype, {
   close: kEnumerableProperty,
   enqueue: kEnumerableProperty,
   error: kEnumerableProperty,
+  [SymbolToStringTag]: getNonWritablePropertyDescriptor(ReadableStreamDefaultController.name)
 });
 
 function createReadableStreamDefaultController() {
@@ -1048,8 +1051,6 @@ function createReadableStreamDefaultController() {
 class ReadableByteStreamController {
   [kType] = 'ReadableByteStreamController';
 
-  get [SymbolToStringTag]() { return this[kType]; }
-
   constructor() {
     throw new ERR_ILLEGAL_CONSTRUCTOR();
   }
@@ -1168,6 +1169,7 @@ ObjectDefineProperties(ReadableByteStreamController.prototype, {
   close: kEnumerableProperty,
   enqueue: kEnumerableProperty,
   error: kEnumerableProperty,
+  [SymbolToStringTag]: getNonWritablePropertyDescriptor(ReadableByteStreamController.name)
 });
 
 function createReadableByteStreamController() {

lib/internal/webstreams/transformstream.js

@@ -64,6 +64,14 @@ const {
 
 const assert = require('internal/assert');
 
+const getNonWritablePropertyDescriptor = (value) => {
+  return {
+    __proto__: null,
+    configurable: true,
+    value,
+  };
+};
+
 /**
  * @typedef {import('./queuingstrategies').QueuingStrategy
  * } QueuingStrategy
@@ -102,8 +110,6 @@ const assert = require('internal/assert');
 class TransformStream {
   [kType] = 'TransformStream';
 
-  get [SymbolToStringTag]() { return this[kType]; }
-
   /**
    * @param {Transformer} [transformer]
    * @param {QueuingStrategy} [writableStrategy]
@@ -236,6 +242,7 @@ class TransformStream {
 ObjectDefineProperties(TransformStream.prototype, {
   readable: kEnumerableProperty,
   writable: kEnumerableProperty,
+  [SymbolToStringTag]: getNonWritablePropertyDescriptor(TransformStream.name)
 });
 
 function TransferredTransformStream() {
@@ -261,8 +268,6 @@ TransferredTransformStream.prototype[kDeserialize] = () => {};
 class TransformStreamDefaultController {
   [kType] = 'TransformStreamDefaultController';
 
-  get [SymbolToStringTag]() { return this[kType]; }
-
   constructor() {
     throw new ERR_ILLEGAL_CONSTRUCTOR();
   }
@@ -322,6 +327,7 @@ ObjectDefineProperties(TransformStreamDefaultController.prototype, {
   enqueue: kEnumerableProperty,
   error: kEnumerableProperty,
   terminate: kEnumerableProperty,
+  [SymbolToStringTag]: getNonWritablePropertyDescriptor(TransformStreamDefaultController.name)
 });
 
 function createTransformStreamDefaultController() {

lib/internal/webstreams/writablestream.js

@@ -77,6 +77,14 @@ const kAbort = Symbol('kAbort');
 const kCloseSentinel = Symbol('kCloseSentinel');
 const kError = Symbol('kError');
 
+const getNonWritablePropertyDescriptor = (value) => {
+  return {
+    __proto__: null,
+    configurable: true,
+    value,
+  };
+};
+
 /**
  * @typedef {import('../abort_controller').AbortSignal} AbortSignal
  * @typedef {import('./queuingstrategies').QueuingStrategy
@@ -121,8 +129,6 @@ const kError = Symbol('kError');
 class WritableStream {
   [kType] = 'WritableStream';
 
-  get [SymbolToStringTag]() { return this[kType]; }
-
   /**
    * @param {UnderlyingSink} [sink]
    * @param {QueuingStrategy} [strategy]
@@ -295,6 +301,7 @@ ObjectDefineProperties(WritableStream.prototype, {
   abort: kEnumerableProperty,
   close: kEnumerableProperty,
   getWriter: kEnumerableProperty,
+  [SymbolToStringTag]: getNonWritablePropertyDescriptor(WritableStream.name)
 });
 
 function TransferredWritableStream() {
@@ -348,8 +355,6 @@ TransferredWritableStream.prototype[kDeserialize] = () => {};
 class WritableStreamDefaultWriter {
   [kType] = 'WritableStreamDefaultWriter';
 
-  get [SymbolToStringTag]() { return this[kType]; }
-
   /**
    * @param {WritableStream} stream
    */
@@ -487,13 +492,12 @@ ObjectDefineProperties(WritableStreamDefaultWriter.prototype, {
   close: kEnumerableProperty,
   releaseLock: kEnumerableProperty,
   write: kEnumerableProperty,
+  [SymbolToStringTag]: getNonWritablePropertyDescriptor(WritableStreamDefaultWriter.name)
 });
 
 class WritableStreamDefaultController {
   [kType] = 'WritableStreamDefaultController';
 
-  get [SymbolToStringTag]() { return this[kType]; }
-
   constructor() {
     throw new ERR_ILLEGAL_CONSTRUCTOR();
   }
@@ -538,6 +542,7 @@ class WritableStreamDefaultController {
 ObjectDefineProperties(WritableStreamDefaultController.prototype, {
   signal: kEnumerableProperty,
   error: kEnumerableProperty,
+  [SymbolToStringTag]: getNonWritablePropertyDescriptor(WritableStreamDefaultController.name)
 });
 
 function createWritableStreamDefaultController() {

test/parallel/test-webstream-string-tag.js

@@ -0,0 +1,18 @@
+'use strict';
+
+require('../common');
+
+const assert = require('assert');
+
+const classesToBeTested = [ WritableStream, WritableStreamDefaultWriter, WritableStreamDefaultController,
+                            ReadableStream, ReadableStreamBYOBRequest, ReadableStreamDefaultReader,
+                            ReadableStreamBYOBReader, ReadableStreamDefaultController, ReadableByteStreamController,
+                            ByteLengthQueuingStrategy, CountQueuingStrategy, TransformStream,
+                            TransformStreamDefaultController];
+
+
+classesToBeTested.forEach((cls) => {
+  assert.strictEqual(cls.prototype[Symbol.toStringTag], cls.name);
+  assert.deepStrictEqual(Object.getOwnPropertyDescriptor(cls.prototype, Symbol.toStringTag),
+                         { configurable: true, enumerable: false, value: cls.name, writable: false });
+});