My first attempt to use this was in Atom. I tried typing out two separate emojis. In both cases, Rocket replaced the text with whatever was in the clipboard.
This is such an easy app for using GIFs and emoji anywhere. I have it set to launch at start-up and it's hidden in my menubar unless I need to add a cool new GIF. Once I figured out the best process for saving GIFs locally to then enter them into the app, I was settled on using Rocket for my everyday GIF sharing and emoji entry tool.