List duplicated deps on the npm-shrinkwrap.json

list-duplicate-deps-npm-shrinkwrap.js

'use strict';

const shrinkwrap = require('./npm-shrinkwrap.json');
const modules = {};
const duplicatedModules = {};

walk(shrinkwrap, (key, body) => {
  if (!modules[key]) {
    modules[key] = [body.version];
    return;
  }

  modules[key].push(body.version);
  duplicatedModules[key] = modules[key];
});

console.log(duplicatedModules);

function walk(obj, cb) {
  if (!obj) return;
  const deps = obj.dependencies;
  if (!deps) return;
  const keys = Object.keys(deps);
  keys.forEach(key => {
    cb(key, deps[key]);
    walk(deps[key], cb);
  });
}