Typescript 枚举作为接口

Question

I am using a library for TS generation (ts-protoc-gen), which generates the following for enums:

export interface AnimalTypeMap {
    Dog: 0;
    Cat: 1;
    Fish: 2;
    Bird: 3;
}

export const AnimalType: AnimalTypeMap;

1. How should I consume it?

if (arg === AnimalType.Bird) {} // **ERROR**: Variable 'AnimalType' is used before being assigned
if (arg === AnimalTypeMap.Bird) {} // **ERROR**:'AnimalTypeMap' only refers to a type, but is being used as a value here

2. How can it export a const without initializing it?

Answer 1

change your enum class in typescript like bellow

 export interface AnimalTypeMap 
     {
    Dog: Dog;
    Cat: Cat;
    Fish: Fish;
    Bird: Bird;
     }

and in backend use

 [JsonConverter(typeof(StringEnumConverter))]
    public enum AnimalTypeMap {
{
        Dog: 1;
        Cat: 2;
        Fish: 3;
        Bird: 4;
         }

if you use c#

Answer 2

If you include both --ts-out and --js-out to protoc then this works for me:

import {AnimalType, AnimalTypeMap} from "./generated/AnimalType_pb"
const animalType:AnimalTypeMap[keyof AnimalTypeMap] = AnimalType.Bird;

But it's not exactly intuitive and I don't think it's the right way to do it. But at least it works.

EDIT: There's a fork: https://github.com/gnomesley/ts-protoc-gen that generates normal TypeScript enums. It's much more intuitive.