Recursively turn a folder into a JS object, where the directories are subtrees and the files are Buffers

rreaddir.js

const fs = require("fs");

/**
 * Recursively turn a folder into an object, where directories are sub-objects and files are Buffers.
 * Works nicely with github.com/tschaub/mock-fs
 * Requires Node >= 8.6
 * @param {string} dirpath
 * @param {bool} full - pass this as true at the start to make the top level dir an absolute path
 */
const rreaddir = async function(dirpath, full = false) {
  return new Promise((resolve, reject) => {
    fs.readdir(dirpath, (err, items) => {
      if (err) reject(err);
      resolve(
        items.reduce(async (prev, shortName) => {
          let contents;
          const fullName = path.join(dirpath, shortName);
          if (fs.lstatSync(fullName).isDirectory()) {
            const subfolder = await rreaddir(fullName);
            contents = { [full ? fullName : shortName]: subfolder };
          } else {
            contents = {
              [shortName]: await new Promise((resolve) =>
                fs.readFile(fullName, "utf8", (err, data) => resolve(data)),
              ),
            };
          }
          return {
            ...(await prev),
            ...contents,
          };
        }, {}),
      );
    });
  });
};