Script to print the sizes of files in order of largest to smallest within their parent folders. Useful for investigating large folders for things which should be deleted or archived for space.

file-size-listing.js

var fs = require("fs"); //Load the filesystem module
const { join } = require('path');

class FileNode {
    constructor(path) {
        const isDirectory = fs.lstatSync(path).isDirectory();

        this.path = path;

        if (isDirectory) {
            // Get the children
            this.children = fs.readdirSync(path).map(name => 
                new FileNode(join(path, name)));

            // Get the total based on the children.
            this.setSize(this.children.reduce((total, child) =>
                total + child.size, 0));

            // Sort the children.
            this.children.sort((a, b) => 
                a.size === b.size
                    ? 0
                    : (
                        a.size < b.size
                            ? 1
                            : -1
                    )
            );
        } else {
            this.setSize(fs.statSync(path)["size"]);
        }
    }
    setSize(value) {
        this.size = value;
        this.base10LogFloor = Math.floor(Math.log(value) / Math.log(10)) + 1;
        FileNode.sizeColumnWidth = Math.max(
            FileNode.sizeColumnWidth || 0,
            this.base10LogFloor
        );
    }
    print() {
        const paddingString = (this.size + '')
            .padStart(FileNode.sizeColumnWidth, ' ');
        console.log(paddingString, this.path);
        if (this.children) {
            this.children.forEach(child => child.print());
        }
    }
}

const root = new FileNode(process.argv[2]);
root.print();