What is Spacemacs? Spacemacs is a community-driven Emacs distribution. It is a new way to experience Emacs with a sophisticated and polished set-up focused on ergonomics, mnemonics and consistency. What is Prettier? Prettier is an opinionated code formatter which supports many languages and integrates with most editors. It can be installed through npm. It is recommended to install prettier globally in your system so that your editor integrates it properly and can be even made to auto formatted while saving your files.