Escape async mode in JavaScript

index.js

#!/usr/bin/env node
# SPDX-License-Identifier: MIT
"use strict";

const fs = require("fs");

function main() {

    let path = "test.txt";
    (async () => {

        let x = await handlePromise(path);

        console.log(x);

    })();

    return 0;
}

async function readFile(path) {
    return new Promise((resolve, reject) => {
        fs.readFile(path, "utf-8", (err, data) => {
            if (err) {
                console.log("[*]\tFile Bad.");
                reject(err);
            } else
                resolve(data);
        });
    });
}

async function handlePromise(path) {

    let x = await readFile(path);

    return x;
}

main();

test.txt

Hello World

I figured it out.

Here are some incomplete snippets,

// Fetching data from MongoDB via Mongoose
router.post("/", function(req, res, next) {
  async.waterfall(
    [
        async function(result, cb) {
            await query.findOne(function(err, data) {
              // action
            }
        }
    ]
  );
}

// Storing data
try {
    let save_data = await new_data.save();
    if (save_data) {
        // action
    }
} catch (err) {
    console.log(err);
}