index.js

const ghGot = require('gh-got');
const got = require('got');
const semver = require('semver');
const stable = require('semver-stable');

const token = process.env.RENOVATE_TOKEN;
const repoName = process.argv[2];
const userName = repoName.split('/')[0];
const packageFile = process.argv[3] || 'package.json';

let masterSHA;
let masterPackageJson;

ghGot(`repos/${repoName}/git/refs/head`, {token: token}).then(res => {
  // First, get the SHA for master branch
  res.body.forEach(function(branch) {
    // Loop through all branches because master may not be the first
    if (branch.ref === 'refs/heads/master') {
      // This is the SHA we will create new branches from
      masterSHA = branch.object.sha;
    }
  });
  // Now, retrieve the master package.json
  ghGot(`repos/${repoName}/contents/${packageFile}`, {token: token}).then(res => {
    masterPackageJson = JSON.parse(new Buffer(res.body.content, 'base64').toString());
    // Iterate through dependencies and then devDependencies
    return iterateDependencies('dependencies')
      .then(() => iterateDependencies('devDependencies'));
  }).catch(err => {
    console.log('Error reading master package.json');
  });
});

function iterateDependencies(depType) {
  const deps = masterPackageJson[depType];
  if (!deps) {
    return;
  }
  return Object.keys(deps).reduce((total, depName) => {
    return total.then(() => {
      const currentVersion = deps[depName].replace(/[^\d.]/g, '');

      if (!semver.valid(currentVersion)) {
        console.log('Invalid current version');
        return;
      }

      // supports scoped packages, e.g. @user/package
      return got(`https://registry.npmjs.org/${depName.replace('/', '%2F')}`, { json: true })
        .then(res => {
          let allUpgrades = {};
          Object.keys(res.body['versions']).forEach(function(version) {
            if (stable.is(currentVersion) && !stable.is(version)) {
              return;
            }
            if (semver.gt(version, currentVersion)) {
              var thisMajor = semver.major(version);
              if (!allUpgrades[thisMajor] || semver.gt(version, allUpgrades[thisMajor])) {
                allUpgrades[thisMajor] = version;
              }
            }
          });

          let upgradePromises = [];

          Object.keys(allUpgrades).forEach(function(upgrade) {
            const nextVersion = allUpgrades[upgrade];
            upgradePromises.push(updateDependency(depType, depName, currentVersion, nextVersion));
          });