nestjs-param-auth-decorator.ts

import { createParamDecorator, ExecutionContext } from '@nestjs/common';
import { GqlExecutionContext } from '@nestjs/graphql';

export const CurrentUserToken = createParamDecorator((data, context: ExecutionContext) => {
  const ctx = GqlExecutionContext.create(context).getContext();
  const authHeader: string = ctx.headers.authorization;

  return authHeader.replace('Bearer ', '');
});