This is a nice feature added to a great project. It's used in Whaleshares.io to let users add emoji's into their posts. Adding this feature means the users can load in a smaller spritesheet, instead of individual files.
Repository
https://github.com/missive/emoji-mart
New Features
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What feature(s) did you add? One thing I needed on a project was use of spritesheets for the nodejs library for emoji-mart. One of my collegues suggested and made a github issue. So I decided on my off time to work on it, and I made a merge request.
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How did you implement it/them? The main thing I did was allow for a seperate value for the Custom Emoji object called spriteUrl. This puts it as a background image, and everything is already built in.
While it was simple, it will allow a lot of users to easily use spritsheets for emoji-mart.
GitHub Account
https://github.com/Kennybll
Thanks, @kennybll