我想将token: string字段添加到FastifyContext接口。为此，我创建了以下文件结构：

projectDir
|__src
|  |__@types
|  |  |__fastify
|  |  |  |__index.d.ts
|  |__api
|  |  |__authHook.ts
|__tsconfig.json

src/@types/fatify/index.d.ts的内容：

declare module 'fastify' {
    export interface FastifyContext<ContextConfig>{
        token: string
    }
}

src/api/authHook.ts的含量

import {FastifyRequest, FastifyReply} from "fastify";

export default async function authHook(request: FastifyRequest, reply: FastifyReply): Promise<void>{
    // Some logic 
    const token = "example_token" // some result from logic 
    request.context.token = token;
}

tsconfig.json的内容：

{
  "compilerOptions": {
     ...
     "typeRoots": ["src/@types"],
     ...
  }
}

但是当我运行代码时，我得到以下错误：

Property 'token' does not exist on type 'FastifyContext<unknown>'.

我做错了什么？