A NodeJS script to rename output PNG files by PowerPoint so they can be sorted by file name

PowerPointPNGRenamer.js

const readline = require("readline");
const fs = require("fs");
const path = require("path");

class Renamer {

    input() {
        const rl = readline.createInterface({
            input: process.stdin,
            output: process.stdout,
        });

        rl.question("Enter folder: ", answer => this.renameFilesInFolder(answer));
    }

    renameFilesInFolder(folder) {
        const files = fs.readdirSync(folder);
        console.log(`${files.length} files found.`);

        for (let i = 1; i <= files.length; i++) {
            try {
                let src = path.join(folder, `Slide${i}.PNG`);
                let dest = path.join(folder, `Slide${this._appendZero(i)}.PNG`)

                fs.renameSync(src, dest);
            } catch (e) {
                console.error(e);
            }
        }

        process.exit(0);
    }

    _appendZero(i) {
        let result = i.toString();

        while (result.length < 5) {
            result = "0" + result;
        }

        return result;
    }

}

(function () {
    new Renamer().input();
})();