stream: add Symbol.toStringTag to Compression Streams

PR-URL: #50712 Reviewed-By: Yagiz Nizipli <[email protected]> Reviewed-By: Matteo Collina <[email protected]>

Author: panva

lib/internal/webstreams/compression.js

@@ -2,6 +2,7 @@
 
 const{
  ObjectDefineProperties,
+ SymbolToStringTag,
 }=primordials;
 
 const{
@@ -137,11 +138,21 @@ class DecompressionStream{
 ObjectDefineProperties(CompressionStream.prototype,{
 readable: kEnumerableProperty,
 writable: kEnumerableProperty,
+[SymbolToStringTag]: {
+__proto__: null,
+configurable: true,
+value: 'CompressionStream',
+},
 });
 
 ObjectDefineProperties(DecompressionStream.prototype,{
 readable: kEnumerableProperty,
 writable: kEnumerableProperty,
+[SymbolToStringTag]: {
+__proto__: null,
+configurable: true,
+value: 'DecompressionStream',
+},
 });
 
 module.exports={

test/parallel/test-whatwg-webstreams-compression.js

@@ -15,6 +15,9 @@ async function test(format){
 constgzip=newCompressionStream(format);
 constgunzip=newDecompressionStream(format);
 
+assert.strictEqual(gzip[Symbol.toStringTag],'CompressionStream');
+assert.strictEqual(gunzip[Symbol.toStringTag],'DecompressionStream');
+
 gzip.readable.pipeTo(gunzip.writable).then(common.mustCall());
 
 constreader=gunzip.readable.getReader();