lol.js

let deps = require('./deps');
let _ = require('lodash');
let execSync = require('child_process').execSync;
let glob = require('glob').sync;

function mapDeepVersions(dependencies, dependencyMap) {
  Object.keys(dependencies).forEach((key) => {
    let dependency = dependencies[key];
    let versions = dependencyMap[key] = dependencyMap[key] || [];
    versions.push(dependency.version);
    if (dependency.dependencies) {
      mapDeepVersions(dependency.dependencies, dependencyMap);
    }
  });
  return dependencyMap;
}

let depMaps = glob('packages/*').map(dir => {
  let deps = JSON.parse(execSync(`cd ${dir} && npm ls --json`));
  return mapDeepVersions(deps.dependencies, Object.create(null));
});

let combined = _.merge.apply(_, [{}].concat(depMaps));

Object.keys(combined).forEach(dep => {
  combined[dep] = _(combined[dep]).flatten().sort().uniq().value();
});

console.log(combined);