How to use the protobufjs/light.Root function in protobufjs

import pbjs from 'protobufjs/light'
import jsonDescriptor from './service.pb.json'

// create daemon service
const root = pbjs.Root.fromJSON(jsonDescriptor)
export const ServiceName = 'berty.node.Service'
export const service = root.lookup(ServiceName)

const genPayloadPb = (payload, type) => {
  const root = protobuf.Root.fromJSON(jsonDescriptor);
  const PayloadTarget = root.lookupType(type);
  const message = PayloadTarget.create(payload);
  return PayloadTarget.encode(message).finish().toString('hex');
};

const exportPbJson = (jsonDescriptor, ServiceName) => {
  const pbFromJson = pbjs.Root.fromJSON(jsonDescriptor)
  return pbFromJson.lookup(ServiceName)
}

const recoverFromPayload = (payload, type, jsonDescriptor) => {
  const payloadBuf = binary.from(payload, 'hex');
  const root = protobuf.Root.fromJSON(jsonDescriptor);
  const PayloadTarget = root.lookupType(type.charAt(0).toUpperCase() + type.slice(1));
  const payloadMessage = PayloadTarget.decode(payloadBuf);
  return PayloadTarget.toObject(payloadMessage, {
    enums: String,
    longs: Number,
  });
};

import pbjs from 'protobufjs/light'
import jsonDescriptor from './message.pb.json'

const root = pbjs.Root.fromJSON(jsonDescriptor)
export const Message = root.lookup('berty.entity.Message')
export default Message

import pbjs from 'protobufjs/light'
import jsonDescriptor from './kind.pb.json'

const root = pbjs.Root.fromJSON(jsonDescriptor)
export const Kind = root.lookup('berty.entity.Kind')
export default Kind

import pbjs from 'protobufjs/light'
import jsonDescriptor from './event.pb.json'

const root = pbjs.Root.fromJSON(jsonDescriptor)
export const Event = root.lookup('berty.entity.Event')
export default Event