grpc-js: Implement server interceptors

Author: murgatroid99

packages/grpc-js/src/call-interface.ts

@@ -37,7 +37,7 @@ export interface StatusObject {
 }
 
 export type PartialStatusObject = Pick<StatusObject, 'code' | 'details'> & {
-  metadata: Metadata | null;
+  metadata?: Metadata | null | undefined;
 };
 
 export const enum WriteFlags {

packages/grpc-js/src/index.ts

@@ -49,6 +49,7 @@ import {
 import { Metadata, MetadataOptions, MetadataValue } from './metadata';
 import {
   Server,
+  ServerOptions,
   UntypedHandleCall,
   UntypedServiceImplementation,
 } from './server';
@@ -226,7 +227,7 @@ export const setLogVerbosity = (verbosity: LogVerbosity): void => {
   logging.setLoggerVerbosity(verbosity);
 };
 
-export { Server };
+export { Server, ServerOptions };
 export { ServerCredentials };
 export { KeyCertPair };
 
@@ -264,6 +265,18 @@ export { addAdminServicesToServer } from './admin';
 
 export { ServiceConfig, LoadBalancingConfig, MethodConfig, RetryPolicy } from './service-config';
 
+export {
+  ServerListener,
+  FullServerListener,
+  ServerListenerBuilder,
+  Responder,
+  FullResponder,
+  ResponderBuilder,
+  ServerInterceptingCallInterface,
+  ServerInterceptingCall,
+  ServerInterceptor
+} from './server-interceptors';
+
 import * as experimental from './experimental';
 export { experimental };