stream: fix isErrored/isWritable for WritableStreams

PR-URL: https://github.com/nodejs/node/pull/60905
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>

lib/internal/webstreams/writablestream.js

@@ -76,6 +76,8 @@ const {
 
 const {
   kIsClosedPromise,
+  kIsErrored,
+  kIsWritable,
   kControllerErrorFunction,
 } = require('internal/streams/utils');
 
@@ -183,6 +185,14 @@ class WritableStream {
       size);
   }
 
+  get [kIsErrored]() {
+    return this[kState].state === 'errored';
+  }
+
+  get [kIsWritable]() {
+    return this[kState].state === 'writable';
+  }
+
   /**
    * @readonly
    * @type {boolean}