This post is part of the F# Advent Calendar in English 2015. Be sure to check out the other posts! Ionide is a set of plugins that allow cross-platform F# development within the Atom and Visual Studio Code text editors. The project was started by Krzysztof Cieślak earlier this year and has grown to a handful of contributors since. Development of the plugin is done in F# and transpiled to JavaScript using FunScript.