如何在nest.js中创建装饰器？

import { SetMetadata } from '@nestjs/common';

export const CustomDecorator = (data: string) => SetMetadata('customData', data);

import { Controller, Get } from '@nestjs/common';
import { CustomDecorator } from './custom.decorator';

@Controller('example')
export class ExampleController {
  @Get()
  @CustomDecorator('someData')
  getExample() {
    // 处理逻辑
  }
}

import { Injectable, NestInterceptor, ExecutionContext, CallHandler } from '@nestjs/common';
import { Reflector } from '@nestjs/core';

@Injectable()
export class ExampleInterceptor implements NestInterceptor {
  constructor(private reflector: Reflector) {}

  intercept(context: ExecutionContext, next: CallHandler) {
    const customData = this.reflector.get<string>('customData', context.getHandler());
    // 使用元数据进行处理逻辑
    return next.handle();
  }
}