diff --git a/packages/grpc-js/package.json b/packages/grpc-js/package.json
index ee910cfb..b4c2d285 100644
--- a/packages/grpc-js/package.json
+++ b/packages/grpc-js/package.json
@@ -15,7 +15,6 @@
   "types": "build/src/index.d.ts",
   "license": "Apache-2.0",
   "devDependencies": {
-    "@grpc/proto-loader": "^0.6.0-pre6",
     "@types/gulp": "^4.0.6",
     "@types/gulp-mocha": "0.0.32",
     "@types/lodash": "^4.14.108",
@@ -24,9 +23,9 @@
     "@types/node": "^12.7.5",
     "@types/pify": "^3.0.2",
     "@types/semver": "^6.0.1",
+    "@types/yargs": "^15.0.5",
     "clang-format": "^1.0.55",
     "execa": "^2.0.3",
-    "google-auth-library": "^6.0.0",
     "gts": "^2.0.0",
     "gulp": "^4.0.2",
     "gulp-mocha": "^6.0.0",
@@ -36,7 +35,8 @@
     "pify": "^4.0.1",
     "rimraf": "^3.0.2",
     "ts-node": "^8.3.0",
-    "typescript": "^3.7.2"
+    "typescript": "^3.7.2",
+    "yargs": "^15.4.1"
   },
   "contributors": [
     {
@@ -49,6 +49,7 @@
     "compile": "tsc -p .",
     "format": "clang-format -i -style=\"{Language: JavaScript, BasedOnStyle: Google, ColumnLimit: 80}\" src/*.ts test/*.ts",
     "generate-types": "proto-loader-gen-types --keepCase --longs String --enums String --defaults --oneofs --json --includeComments --includeDirs deps/envoy-api/ deps/udpa/ deps/googleapis/ deps/protoc-gen-validate/ -O src/generated/ --grpcLib ../index envoy/service/discovery/v2/ads.proto envoy/service/load_stats/v2/lrs.proto envoy/api/v2/listener.proto envoy/api/v2/route.proto envoy/api/v2/cluster.proto envoy/api/v2/endpoint.proto envoy/config/filter/network/http_connection_manager/v2/http_connection_manager.proto",
+    "generate-interop-types": "proto-loader-gen-types --keep-case --longs String --enums String --defaults --oneofs --json --includeComments --includeDirs proto/ -O interop/generated --grpcLib ../../src grpc/testing/test.proto",
     "lint": "npm run check",
     "prepare": "npm run compile",
     "test": "gulp test",
@@ -58,6 +59,8 @@
     "posttest": "npm run check"
   },
   "dependencies": {
+    "@grpc/proto-loader": "^0.6.0-pre14",
+    "google-auth-library": "^5.10.1",
     "semver": "^6.2.0"
   },
   "files": [
diff --git a/packages/grpc-js/src/load-balancer-weighted-target.ts b/packages/grpc-js/src/load-balancer-weighted-target.ts
index 04145914..e8a5fe65 100644
--- a/packages/grpc-js/src/load-balancer-weighted-target.ts
+++ b/packages/grpc-js/src/load-balancer-weighted-target.ts
@@ -229,7 +229,7 @@ export class WeightedTargetLoadBalancer implements LoadBalancer {
         picker = new WeightedTargetPicker(pickerList);
         break;
       case ConnectivityState.CONNECTING:
-      case ConnectivityState.READY:
+      case ConnectivityState.IDLE:
         picker = new QueuePicker(this);
         break;
       default:
diff --git a/packages/grpc-js/src/server-call.ts b/packages/grpc-js/src/server-call.ts
index 82d88517..2a75f01e 100644
--- a/packages/grpc-js/src/server-call.ts
+++ b/packages/grpc-js/src/server-call.ts
@@ -81,7 +81,7 @@ export type ServerSurfaceCall = {
 } & EventEmitter;
 
 export type ServerUnaryCall<RequestType, ResponseType> = ServerSurfaceCall & {
-  request: RequestType | null;
+  request: RequestType;
 };
 export type ServerReadableStream<
   RequestType,
@@ -91,7 +91,7 @@ export type ServerWritableStream<
   RequestType,
   ResponseType
 > = ServerSurfaceCall &
-  ObjectWritable<ResponseType> & { request: RequestType | null };
+  ObjectWritable<ResponseType> & { request: RequestType };
 export type ServerDuplexStream<RequestType, ResponseType> = ServerSurfaceCall &
   ObjectReadable<RequestType> &
   ObjectWritable<ResponseType>;
@@ -99,15 +99,14 @@ export type ServerDuplexStream<RequestType, ResponseType> = ServerSurfaceCall &
 export class ServerUnaryCallImpl<RequestType, ResponseType> extends EventEmitter
   implements ServerUnaryCall<RequestType, ResponseType> {
   cancelled: boolean;
-  request: RequestType | null;
 
   constructor(
     private call: Http2ServerCallStream<RequestType, ResponseType>,
-    public metadata: Metadata
+    public metadata: Metadata,
+    public request: RequestType
   ) {
     super();
     this.cancelled = false;
-    this.request = null;
     this.call.setupSurfaceCall(this);
   }
 
@@ -157,17 +156,16 @@ export class ServerWritableStreamImpl<RequestType, ResponseType>
   extends Writable
   implements ServerWritableStream<RequestType, ResponseType> {
   cancelled: boolean;
-  request: RequestType | null;
   private trailingMetadata: Metadata;
 
   constructor(
     private call: Http2ServerCallStream<RequestType, ResponseType>,
     public metadata: Metadata,
-    public serialize: Serialize<ResponseType>
+    public serialize: Serialize<ResponseType>,
+    public request: RequestType
   ) {
     super({ objectMode: true });
     this.cancelled = false;
-    this.request = null;
     this.trailingMetadata = new Metadata();
     this.call.setupSurfaceCall(this);
 
@@ -268,7 +266,7 @@ ServerDuplexStreamImpl.prototype.end = ServerWritableStreamImpl.prototype.end;
 // Unary response callback signature.
 export type sendUnaryData<ResponseType> = (
   error: ServerErrorResponse | ServerStatusResponse | null,
-  value: ResponseType | null,
+  value?: ResponseType | null,
   trailer?: Metadata,
   flags?: number
 ) => void;
@@ -506,7 +504,7 @@ export class Http2ServerCallStream<
 
   async sendUnaryMessage(
     err: ServerErrorResponse | ServerStatusResponse | null,
-    value: ResponseType | null,
+    value?: ResponseType | null,
     metadata?: Metadata,
     flags?: number
   ) {
diff --git a/packages/grpc-js/src/server.ts b/packages/grpc-js/src/server.ts
index 683198c5..8fdacd4d 100644
--- a/packages/grpc-js/src/server.ts
+++ b/packages/grpc-js/src/server.ts
@@ -622,22 +622,23 @@ async function handleUnary<RequestType, ResponseType>(
   handler: UnaryHandler<RequestType, ResponseType>,
   metadata: Metadata
 ): Promise<void> {
-  const emitter = new ServerUnaryCallImpl<RequestType, ResponseType>(
-    call,
-    metadata
-  );
   const request = await call.receiveUnaryMessage();
 
   if (request === undefined || call.cancelled) {
     return;
   }
+  
+  const emitter = new ServerUnaryCallImpl<RequestType, ResponseType>(
+    call,
+    metadata,
+    request
+  );
 
-  emitter.request = request;
   handler.func(
     emitter,
     (
       err: ServerErrorResponse | ServerStatusResponse | null,
-      value: ResponseType | null,
+      value?: ResponseType | null,
       trailer?: Metadata,
       flags?: number
     ) => {
@@ -659,7 +660,7 @@ function handleClientStreaming<RequestType, ResponseType>(
 
   function respond(
     err: ServerErrorResponse | ServerStatusResponse | null,
-    value: ResponseType | null,
+    value?: ResponseType | null,
     trailer?: Metadata,
     flags?: number
   ) {
@@ -689,10 +690,10 @@ async function handleServerStreaming<RequestType, ResponseType>(
   const stream = new ServerWritableStreamImpl<RequestType, ResponseType>(
     call,
     metadata,
-    handler.serialize
+    handler.serialize,
+    request
   );
 
-  stream.request = request;
   handler.func(stream);
 }
 
diff --git a/packages/grpc-js/tsconfig.json b/packages/grpc-js/tsconfig.json
index ba675db7..65ebf089 100644
--- a/packages/grpc-js/tsconfig.json
+++ b/packages/grpc-js/tsconfig.json
@@ -10,6 +10,7 @@
   },
   "include": [
     "src/**/*.ts",
-    "test/**/*.ts"
+    "test/**/*.ts",
+    "interop/**/*.ts"
   ]
 }