Read and Write files from 'fs' not working asynchronously

I am trying to build a script which read and write some files. The functions are working fine but I am having trouble making the read/write functions asynchronously. The main problem I have is that I am trying to write a file and then I am trying to import it. For example: given these two functions, the first one is writing to ./myFile.js and the second function is trying to import the file like this:

var fs = require('fs');
const myFile = require('./myFile')

async function writeMyFile() {
    return new Promise((resolve, reject) => {
        fs.promises.readFile('./myFile.js', 'utf8').then((file) => {

        const replacedData = file + 'newLine'

            fs.promises
                .writeFile('./myFile.js', replacedData)
                .then(() => resolve('Writted'))
                .catch(() => reject('Error'));
        });
    });
}

function importMyFile() {
    console.log(myFile) // this is always empty
}

await writeMyFile()
importMyFile()

The thing is that I can see myFile is being written correctly, but I cannot see it in the importMyFile function. When I try these functions separately it works (executing the first one and then the second one)

I tried the following:

• Using the promise functions from fs library: fs.promises.readFile() and fs.promises.writeFile() (example above)
• Returning a Promise which resolves when writeMyFile ends. (example above)
• Importing the file directly in the readMyFile function like this:

function importMyFile() {
    const myFile = require('./myFile')
    console.log(myFile) // this is always empty
}

• Without returning new Promise like this:

async function writeMyFile() {
    const file = await fs.promises.readFile('./myFile.js', 'utf8')

    const replacedData = file + 'newLine'

    await fs.promises.writeFile('./myFile.js', replacedData)
}

I also see that in the console, the order of the logs are these:

'Writted'
{} //empty file

Keep in mind that this is a simplified version of my case.

EDIT the file I am trying to write and import looks like this ALWAYS:

module.exports = []

And the it is populated, it looks like this:

const myModule = {
    name: 'name',
    surname: 'surname'
}

module.exports = [myModule]

I hope someone knows what is going on here. Thanks!