I installed emojione 3.1.2 via npm and it worked well on webpack development environment.
But when I build project with webpack in production environment, emojione got something wrong.
I google and find this url which occurred the same problem.
Step1. Download Emojione CDN files in your project.
Step2. Modified below code in emojione.min.js
Step3. Exclude "emojione.min.js" and "emojione.min.css" from webpack build process.