title: Util is not defined when referencing individual jQuery plugins (modal.js) via webpack
body: <p>I have both modal.js and util.js be bundled in main.js(modal.js have dependency on util.js).</p>
  
  <p>But when I load page with main.js, it through error "Util is not a function".</p>
  
  <p>Problem solved.This issue is happening because bootstrap-4, doesn't respect UMD after the version v4.0.0-alpha.3. So referring src modal js file resolve the issue.
  <a href="https://github.com/twbs/bootstrap/issues/20709" rel="nofollow noreferrer">https://github.com/twbs/bootstrap/issues/20709</a></p>