async函数可以写返回值吗,如果使用async函数封装node自带的模块是不是一定要经过promise

const fs = require('fs');
const path = require('path');

function promiseReadFile(path) {
    return new Promise((resolve,reject)=>{
        fs.readFile(path,(err,res)=>{
            if (err){
                reject(err);
                return;
            }
            resolve(res);
        });
    });
}
async function asyncReadFile(path) { //我想在这个函数中直接return res怎么做到
    let res = await promiseReadFile(path);
    console.log(res.toString());
    return res;
}
asyncReadFile(path.resolve(__dirname,'./data/1.txt')); //这样运行是可以的


// let res = asyncReadFile(path.resolve(__dirname,'./data/1.txt')); //我想把函数的返回值赋给res  打印结果是 [object Promise]
// console.log(res);
//求赐教!!!!!!!!!

const fs = require('fs');
const path = require('path');

function promiseReadFile(path) {
    return new Promise((resolve,reject)=>{
        fs.readFile(path,(err,res)=>{
            if (err){
                reject(err);
                return;
            }
            resolve(res);
        });
    });
}
(async function(){ //上面的代码多走了一步  直接在async中调用就好  想法有问题
    let res = await promiseReadFile(path.resolve(__dirname,'./data/1.txt'));
    console.log(res.toString());
})();