frontend/build-scripts/util.js

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

// Helper function to map recursively over files in a folder and it's subfolders
module.exports.mapFiles = function mapFiles(startPath, filter, mapFunc) {
  const files = fs.readdirSync(startPath);
  for (let i = 0; i < files.length; i++) {
    const filename = path.join(startPath, files[i]);
    const stat = fs.lstatSync(filename);
    if (stat.isDirectory()) {
      mapFiles(filename, filter, mapFunc);
    } else if (filename.indexOf(filter) >= 0) {
      mapFunc(filename);
    }
  }
};