http2: add writableObjectMode and writableNeedDrain getters to Http2ServerResponse

lib/internal/http2/compat.js

@@ -555,6 +555,14 @@ class Http2ServerResponse extends Stream {
     return this[kStream].writableFinished;
   }
 
+  get writableObjectMode() {
+    return this[kStream].writableObjectMode;
+  }
+
+  get writableNeedDrain() {
+    return this[kStream].writableNeedDrain;
+  }
+
   get writableLength() {
     return this[kStream].writableLength;
   }

test/fixtures/http2/test-writable-props.js

@@ -0,0 +1,31 @@
+'use strict';
+
+const { createServer } = require('http2');
+const { mustCall } = require('../common');
+
+const server = createServer();
+server.on('stream', (stream) => {
+  // writableObjectMode and writableNeedDrain should be defined (boolean)
+  console.log('writableObjectMode:', stream.writableObjectMode);
+  console.log('writableNeedDrain:', stream.writableNeedDrain);
+  if (typeof stream.writableObjectMode !== 'boolean') {
+    throw new Error(`writableObjectMode should be boolean, got ${stream.writableObjectMode}`);
+  }
+  if (typeof stream.writableNeedDrain !== 'boolean') {
+    throw new Error(`writableNeedDrain should be boolean, got ${stream.writableNeedDrain}`);
+  }
+  stream.respond();
+  stream.end('ok');
+});
+server.listen(0, mustCall(() => {
+  const client = require('http2').connect(`http://localhost:${server.address().port}`);
+  const req = client.request();
+  req.on('response', () => {
+    req.on('data', () => {});
+    req.on('end', () => {
+      client.close();
+      server.close();
+      console.log('PASS: writableObjectMode and writableNeedDrain are booleans');
+    });
+  });
+}));

test/parallel/test-http2-res-writable-properties.js

@@ -8,6 +8,8 @@ const server = http2.createServer(common.mustCall((req, res) => {
   const hwm = req.socket.writableHighWaterMark;
   assert.strictEqual(res.writableHighWaterMark, hwm);
   assert.strictEqual(res.writableLength, 0);
+  assert.strictEqual(typeof res.writableObjectMode, 'boolean');
+  assert.strictEqual(typeof res.writableNeedDrain, 'boolean');
   res.write('');
   const len = res.writableLength;
   res.write('asd');