Experimental Promises Do Not Work (Cannot read property 'interceptors' of undefined)

After enabling experimental_features, I get the following error:

TypeError: Cannot read property 'interceptors' of undefined
    at ExampleClient.makeUnaryRequest (app/client_image.binary.runfiles/npm/node_modules/@grpc/grpc-js/src/client.ts:295:52)
    at ExampleClient.add (app/client_image.binary.runfiles/npm/node_modules/@grpc/grpc-js/src/make-client.ts:174:15)
    at example.ts:123:61
    at new Promise (<anonymous>)
    at ExampleClient.add (example.ts:123:16)
    at client.ts:17:33
    at Generator.next (<anonymous>)
    at /app/client_image.binary.runfiles/repro/client.js:7:71
    at new Promise (<anonymous>)
    at __awaiter (/app/client_image.binary.runfiles/repro/client.js:3:12)

You can try it yourself by cloning this commit: https://github.com/flolu/typescript-protobuf-bazel-rpc/tree/8f1c47cb9944064384e9f87db2c30f0a98a2b6a2

1. Run yarn install && yarn build
2. Run yarn start:server
3. Run yarn start:client (error is in the client)

[thesayyn]

https://github.com/thesayyn/protoc-gen-ts/releases/tag/0.3.9 has been released.

This is fixed in the new release.

[thesayyn]

#72 already fixes this problem but it introduces some breaking.