Cannot compile TypeScript hello world client/server

I was following the [quickstart document](https://grpc.io/docs/quickstart/node.html) to implement the hello world client server example in TypeScript.



I can compile and run the code fine if I have `noImplicitAny` set to `false` in `tsconfig.json`.  However, if I have it set to `true`, I get the following error when running `tsc -p .`:

```

node_modules/grpc/index.d.ts:2:55 - error TS7016: Could not find a declaration file for module 'protobufjs'. '.../grpc-example/node_modules/protobufjs/dist/protobuf.js' implicitly has an 'any' type.

  Try `npm install @types/protobufjs` if it exists or add a new declaration (.d.ts) file containing `declare module 'protobufjs';`



2   import { Message, Service as ProtobufService } from "protobufjs";

                                                        ~~~~~~~~~~~~

```

Also, running `npm install @types/protobufjs` does not resolve the issue.



### Environment

 - OS name, version and architecture: OS X Mojave

 - Node version: 8.9.1

 - Node installation method: nvm

 - Package name and version: @grpc/proto-loader@0.3.0, grpc@1.15.1

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