fix: rename variable and use nullish coalesce

packages/grpc-js/README.md

@@ -70,7 +70,7 @@ Many channel arguments supported in `grpc` are not supported in `@grpc/grpc-js`.
   - `grpc-node.max_session_memory`
   - `grpc-node.tls_enable_trace`
   - `grpc-node.retry_max_attempts_limit`
-  - `grpc-node.http2_initial_window_size`
+  - `grpc-node.flow_control_window`
   - `channelOverride`
   - `channelFactoryOverride`
 

packages/grpc-js/src/channel-options.ts

@@ -64,7 +64,7 @@ export interface ChannelOptions {
   'grpc-node.tls_enable_trace'?: number;
   'grpc.lb.ring_hash.ring_size_cap'?: number;
   'grpc-node.retry_max_attempts_limit'?: number;
-  'grpc-node.http2_initial_window_size'?: number;
+  'grpc-node.flow_control_window'?: number;
   // eslint-disable-next-line @typescript-eslint/no-explicit-any
   [key: string]: any;
 }

packages/grpc-js/src/transport.ts

@@ -675,7 +675,7 @@ export class Http2SubchannelConnector implements SubchannelConnector {
         },
         settings: {
           initialWindowSize:
-            options['grpc-node.http2_initial_window_size'] ||
+            options['grpc-node.flow_control_window'] ??
             http2.getDefaultSettings().initialWindowSize,
         }
       });