john-test-upgrade/lib/installDeps.js

Upgrade tool for Babel

var hasYarn = require('has-yarn');

var spawn = require('cross-spawn');

module.exports = function installDeps(cwd) {
  var isYarn = hasYarn(cwd);
  var cmd = isYarn ? 'yarn' : 'npm';
  var args = ['install'];
  console.log(`Installing dependencies using "${cmd}"`);
  spawn.sync(cmd, args, {
    stdio: 'inherit'
  });
};