grpc-web: Typescript Type Check Errors

Some errors exposed when I try to compile my generated typescript code.

One error message here:

Argument of type '(request: Empty) => Uint8Array' is not assignable to parameter of type '(request: {}) => {}'.
  Types of parameters 'request' and 'request' are incompatible.
    Type '{}' is not assignable to type 'Empty'.
      Property 'serializeBinary' is missing in type '{}'.

And I found the generation code is here: https://github.com/grpc/grpc-web/blob/86631990e365130d5cfca3aa93613ec1eeef7da4/javascript/net/grpc/web/grpc_generator.cc#L395

Another error message here:

Argument of type '(err: Error, response: Empty) => void' is not assignable to parameter of type '(err: Error, response: {}) => void'.
  Types of parameters 'response' and 'response' are incompatible.
    Type '{}' is not assignable to type 'Empty'.

And I found the generation code is here: https://github.com/grpc/grpc-web/blob/86631990e365130d5cfca3aa93613ec1eeef7da4/javascript/net/grpc/web/grpc_generator.cc#L438

The part of the wrong generated code shows here:

methodInfoSome = new grpcWeb.AbstractClientBase.MethodInfo(
    Empty,
    (request: SomeRequest) => {  // Here is the first error
      return request.serializeBinary();
    },
    Empty.deserializeBinary
  );

  some(
    request: SomeRequest,
    metadata: grpcWeb.Metadata,
    callback: (err: grpcWeb.Error,
               response: Empty) => void) {
    return this.client_.rpcCall(
      this.hostname_ +
        '/SomePath',
      request,
      metadata,
      this.methodInfoSome,
      callback); // Here is the second error which the callback is `(err: Error, response: Empty) `
  }

The Empty message defined in proto file likes this message Empty {} FYI: My TS version is 3.0.1