protobuf.js wrapper types + null

MyHappyProto.proto

syntax = "proto3";

import "google/protobuf/wrappers.proto";

message MyHappyProto {
  string id = 1;
  google.protobuf.StringValue name = 2;
  google.protobuf.StringValue address = 3;
  google.protobuf.StringValue something = 4;
  google.protobuf.StringValue nullable = 5;
}

output

$ npm start

> [email protected] start
> node index.js

jsonInput {
  id: '1',
  name: { value: 'name' },
  address: {},
  something: undefined,
  nullable: null
}
Calling fromObject...
  StringValue.fromObject { value: 'name' }
  StringValue.fromObject {}
Calling toObject...
  StringValue.toObject StringValue { value: 'name' } object
  StringValue.toObject StringValue {} object
decodedHappyProto { id: '1', name: 'name', address: null }

protobufjs.js

import protobuf from "protobufjs";

protobuf.wrappers['.google.protobuf.StringValue'] = {
  fromObject(value) {
    console.log('  StringValue.fromObject', value)
    return this.fromObject(value)
  },
  toObject(message, options) {
    console.log('  StringValue.toObject', message, typeof message)
    
    if (Object.keys(message).length === 0)
      return null;
    else if (message.value)
      return message.value
  },
}

// Load MyHappyProto
const proto = await protobuf.load("MyHappyProto.proto")
const MyHappyProto = proto.lookupType('MyHappyProto')

const jsonInput = {
  id: '1',
  name: { value: 'name' },
  address: { },
  something: undefined,
  nullable: null,
}

console.log('jsonInput', jsonInput)

// Validate Input
const error = MyHappyProto.verify(jsonInput)
if (error) throw error

// JSON -> Message
console.log('Calling fromObject...')
const myHappyProtoMessage = MyHappyProto.fromObject(jsonInput)

// Message -> Bytes
const encodedMessageBuffer = MyHappyProto.encode(myHappyProtoMessage).finish();

// Bytes -> Message
const decodedHappyProtoMessage = MyHappyProto.decode(encodedMessageBuffer);

// Message -> JSON
console.log('Calling toObject...')
const decodedHappyProto = MyHappyProto.toObject(decodedHappyProtoMessage);

console.log('decodedHappyProto', decodedHappyProto)