Add gRPC metadata example

I’m submitting a…

[ ] Regression 
[ ] Bug report
[ ] Feature request
[ ] Documentation issue or request (new chapter/page)
[ ] Support request => Please do not submit support request here, instead post your question on Stack Overflow.

Current behavior

Expected behavior

As a user, I would like to see passing gRPC metadata example

Minimal reproduction of the problem with instructions

What is the motivation / use case for changing the behavior?

Environment

For Tooling issues:
- Node version: XX  
- Platform:  

Others:

[kerf007]

I have similar issue. I’m as grpc client have to add jwt token to each request to grpc server and I don’t understand how to do it. Help please 😃

[kwado-tech]

This doc illustrates the use of ts-proto package to generate ts files from .proto schemas.

here is an example script to generate for user.proto schema

# nestJs - /gen-nestjs-proto.sh
generate_nestjs_proto_definitions() {
    # remove directory if exists
    rm -r ./src/proto/nestjs

    # make directory
    mkdir ./src/proto/nestjs

    # generate definitions
    protoc --plugin=./node_modules/.bin/protoc-gen-ts_proto --ts_proto_opt=addGrpcMetadata=true --ts_proto_opt=nestJs=true --ts_proto_out=./src/proto/nestjs ./src/proto/user.proto
}