get the size of a directory in bytes using node

size.js

// EXPORT THE SIZE OF A DIRECTORY USING NODE
const fs = require('fs');
const path = require('path');
const yargs = require('yargs');
const argv = yargs.argv;
const dist = argv.dir;

// du -ach ./dist // unix command

const walkSync = (dir, filelist = []) => {
    fs.readdirSync(dir).forEach(file => {
        filelist = fs.statSync(path.join(dir, file)).isDirectory()
            ? walkSync(path.join(dir, file), filelist)
            : filelist.concat({
                name: file,
                path: path.join(dir, file),
                size: fs.statSync(path.join(dir, file)).size
            });
    });
    return filelist;
};



let build = walkSync(dist);
build = build.map(value => value.size);
const reducer = (accumulator, currentValue) => accumulator + currentValue;

const message = `Total size => ${build.reduce(reducer)} bytes`;


module.exports = message;

place this command in your package.json for convenience

"scripts": {
"foo": "node size.js --dir="./dist"",
}