Node.js read all files in folder and subfolders

nodeFilesWalk.js

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

const walkSync = (dir, callback) => {
    const files = fs.readdirSync(dir);
    files.forEach((file) => {
        var filepath = path.join(dir, file);
        const stats = fs.statSync(filepath);
        if (stats.isDirectory()) {
            walkSync(filepath, callback);
        } else if (stats.isFile()) {
            callback(dir, file, filepath, stats);
        }
    });
};

console.log("Start processing..");

const myArgs = process.argv.slice(2);
const dir = myArgs[0];

walkSync(dir, (dir, file, filepath, stats) => {
    // TODO actions with file
    console.log("File", filepath, "processed");
});

console.log("All data processed successfully!");