upgrading to @grpc/proto-loader; hit with new error!

[Don Viszneki]

Hi all :)

I have finally heeded the deprecation warning coming from the `grpc`
npm package:

```
(node:84472) DeprecationWarning: grpc.load: Use the @grpc/proto-loader
module with grpc.loadPackageDefinition instead
```

However, the newer version of protobufs employed by
`@grpc/proto-loader` does not like my custom options:

```
Error: unresolvable extensions: 'extend google.protobuf.FileOptions'
in .chat, 'extend google.protobuf.MessageOptions' in .chat, 'extend
google.protobuf.FieldOptions' in .chat
```

Lines 5-14 of `chat.proto` are included here and at the link below:

```
import "google/protobuf/descriptor.proto";
extend google.protobuf.FileOptions {
string tin_module_validation = 4000;
}
extend google.protobuf.MessageOptions {
string tin_message_validation = 4000;
}
extend google.protobuf.FieldOptions {
string tin_field_validation = 4000;
}
```

https://github.com/dvisztempacct/bs-grpc-server-example/blob/7e5729f787c7678be00954798664b95014b2b303/chat.proto#L5-L14

Any help would be greatly appreciated!

[Adam Cozzette]

I believe gRPC for Node actually uses Protobuf.js, which is an independent protobuf implementation that we don't maintain ourselves. Your best bet might be to file an issue with https://github.com/grpc/grpc-node since the gRPC folks should be able to figure out whether it's a gRPC issue or a Protobuf.js issue.

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[Tyler Jackson]

Did you ever resolve this? I have just hit this exact problem but haven't seen any open or closed issues addressing it.

Thanks!